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TZFS/asm/cbiosII.asm

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;--------------------------------------------------------------------------------------------------------
;-
;- Name: cbiosII.asm
;- Created: January 2020
;- Author(s): Philip Smart
;- Description: Sharp MZ series CPM BIOS System.
;- This assembly language program is written to utilise the paged RAM memory modes of
;- the tranZPUter hardware running on the Sharp MZ80A computer. The purpose is to
;- provide more TPA to CP/M by hiding the support logic in a RAM bank outside of the
;- 64K address space of CPM. The basics have to exist within the 64K for CP/M to
;- function correctly, ie. disk buffers, stack and jump tables but the remainder
;- are placed in a different bank which has 48K available RAM just for CBIOS.
;-
;- Credits:
;- Copyright: (c) 2018-20 Philip Smart <philip.smart@net2net.org>
;-
;- History: Jan 2020 - Seperated Bank from RFS for dedicated use with CPM CBIOS.
; May 2020 - Advent of the new RFS PCB v2.0, quite a few changes to accommodate the
; additional and different hardware. The SPI is now onboard the PCB and
; not using the printer interface card.
; May 2020 - Cut taken from the MZ80A RFS version of CPM CBIOS to create a version of
; CPM suitable to run on the tranZPUter. The memory models are different
; providing more memory at different locations for use by CPM.
;--------------------------------------------------------------------------------------------------------
;- This source file is free software: you can redistribute it and-or modify
;- it under the terms of the GNU General Public License as published
;- by the Free Software Foundation, either version 3 of the License, or
;- (at your option) any later version.
;-
;- This source file is distributed in the hope that it will be useful,
;- but WITHOUT ANY WARRANTY; without even the implied warranty of
;- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;- GNU General Public License for more details.
;-
;- You should have received a copy of the GNU General Public License
;- along with this program. If not, see <http://www.gnu.org/licenses/>.
;--------------------------------------------------------------------------------------------------------
;======================================
;
; RAM BANK - CPM CBIOS II
;
;======================================
ORG 00000H
; In order to preserve the interrupt vectors when CPM mode 7 is enabled (ie. this
; bank is paged in), the area from 0x0000:0x003F maps to the memory block in mode 6
; so this is unuseable space in this bank. In addition, CPM uses 0x0000:0x0100
; for many vectors and buffers so this memory is also mapped to the memory block in
; mode 6.
;------------ 0x0000 -----------------------------------------------------------
PAD 00040H
;------------ 0x0040 -----------------------------------------------------------
PAD 00100H
;------------ 0x0100 -----------------------------------------------------------
LVARSTART EQU $ ; Start of local page variables.
SPV:
IBUFE: ; TAPE BUFFER (128 BYTES)
ATRB: DS 1 ; ATTRIBUTE
NAME: DS 17 ; FILE NAME
SIZE: DS 2 ; BYTESIZE
DTADR: DS 2 ; DATA ADDRESS
EXADR: DS 2 ; EXECUTION ADDRESS
COMNT: DS 92 ; Comment / code area of CMT header.
SWPW: DS 10 ; SWEEP WORK
KDATW: DS 2 ; KEY WORK
KANAF: DS 1 ; KANA FLAG (01=GRAPHIC MODE)
DSPXY: DS 2 ; DISPLAY COORDINATES
MANG: DS 6 ; COLUMN MANAGEMENT
MANGE: DS 1 ; COLUMN MANAGEMENT END
PBIAS: DS 1 ; PAGE BIAS
ROLTOP: DS 1 ; ROLL TOP BIAS
MGPNT: DS 1 ; COLUMN MANAG. POINTER
PAGETP: DS 2 ; PAGE TOP
ROLEND: DS 1 ; ROLL END
DS 14 ; BIAS
FLASH: DS 1 ; FLASHING DATA
SFTLK: DS 1 ; SHIFT LOCK
REVFLG: DS 1 ; REVERSE FLAG
FLSDT: DS 1 ; CURSOR DATA
STRGF: DS 1 ; STRING FLAG
DPRNT: DS 1 ; TAB COUNTER
SWRK: DS 1 ; KEY SOUND FLAG
TEMPW: DS 1 ; TEMPO WORK
ONTYO: DS 1 ; ONTYO WORK
OCTV: DS 1 ; OCTAVE WORK
RATIO: DS 2 ; ONPU RATIO
DSPXYADDR: DS 2 ; Address of last known position.
DRVAVAIL DS 1 ; Flag to indicate which drive controllers are available. Bit 2 = SD, Bit 1 = ROM, Bit 0 = FDC
MOTON DS 1 ; MOTOR ON = 1, OFF = 0
TMPADR DS 2 ; TEMPORARY ADDRESS STORAGE
TMPSIZE DS 2 ; TEMPORARY SIZE
TMPCNT DS 2 ; TEMPORARY COUNTER
;
FLASHCTL: DS 1 ; CURSOR FLASH CONTROL. BIT 0 = Cursor On/Off, BIT 1 = Cursor displayed.
TIMESEC: DS 6 ; RTC 48bit TIME IN MILLISECONDS
NDISKS: DS 1 ; Dynamically calculated number of disks on boot.
DISKTYPE: DS 1 ; Disk type of current selection.
MTROFFTIMER:DS 1 ; Second down counter for FDC motor off.
;
SEKDSK: DS 1 ; Seek disk number
SEKTRK: DS 2 ; Seek disk track
SEKSEC: DS 1 ; Seek sector number
SEKHST: DS 1 ; Seek sector host
;
HSTACT: DS 1 ;
;
UNACNT: DS 1 ; Unalloc rec cnt
UNADSK: DS 1 ; Last unalloc disk
UNATRK: DS 2 ; Last unalloc track
UNASEC: DS 1 ; Last unalloc sector
;
READOP: DS 1 ; If read operation then 1, else 0 for write.
RSFLAG: DS 1 ; Read sector flag.
WRTYPE: DS 1 ; Write operation type.
DMAADDR: DS 2 ; Last DMA address
FDCCMD DS 1 ; LAST FDC COMMAND SENT TO CONTROLLER.
INVFDCDATA: DS 1 ; INVERT DATA COMING FROM FDC, 1 = INVERT, 0 = AS IS
TRK0FD1 DS 1 ; FD 1 IS AT TRACK 0 = BIT 0 set
TRK0FD2 DS 1 ; FD 2 IS AT TRACK 0 = BIT 0 set
TRK0FD3 DS 1 ; FD 3 IS AT TRACK 0 = BIT 0 set
TRK0FD4 DS 1 ; FD 4 IS AT TRACK 0 = BIT 0 set
RETRIES DS 2 ; DATA READ RETRIES
DISKMAP: DS MAXDISKS ; Disk map of CPM logical to physical controller disk.
FDCDISK: DS 1 ; Physical disk number.
SECPERTRK: DS 1 ; Sectors per track for 1 head.
SECPERHEAD: DS 1 ; Sectors per head.
SECTORCNT: DS 1 ; Sector size as a count of how many sectors make 512 bytes.
HSTDSK: DS 1 ; Host disk number
HSTTRK: DS 2 ; Host track number
HSTSEC: DS 1 ; Host sector number
HSTWRT: DS 1 ; Host write flag
ERFLAG: DS 1 ; Error number, 0 = no error.
TRACKNO: DS 2 ; Host controller track number
SECTORNO: DS 1 ; Host controller sector number
CURSORPSAV DS 2 ; Cursor save position;default 0,0
HAVELOADED DS 1 ; To show that a value has been put in for Ansi emualtor.
ANSIFIRST DS 1 ; Holds first character of Ansi sequence
NUMBERBUF DS 20 ; Buffer for numbers in Ansi
NUMBERPOS DS 2 ; Address within buffer
CHARACTERNO DS 1 ; Byte within Ansi sequence. 0=first,255=other
CURSORCOUNT DS 1 ; 1/50ths of a second since last change
FONTSET DS 1 ; Ansi font setup.
JSW_FF DS 1 ; Byte value to turn on/off FF routine
JSW_LF DS 1 ; Byte value to turn on/off LF routine
CHARACTER DS 1 ; To buffer character to be printed.
CURSORPOS DS 2 ; Cursor position, default 0,0.
BOLDMODE DS 1
HIBRITEMODE DS 1 ; 0 means on, &C9 means off
UNDERSCMODE DS 1
ITALICMODE DS 1
INVMODE DS 1
CHGCURSMODE DS 1
ANSIMODE DS 1 ; 1 = on, 0 = off
COLOUR EQU 0
LVAREND EQU $ ; End of local page variables
IF $ > 0300H
ERROR "Keybuf var not aligned, addr=%s, required=%s"; % $, 0300H
ENDIF
ALIGN_NOPS 0300H
KEYBUF: DS KEYBUFSIZE, 0DH ; Interrupt driven keyboard buffer.
KEYCOUNT: DS 1, 000H
KEYWRITE: DS 2, 000H ; Pointer into the buffer where the next character should be placed.
KEYREAD: DS 2, 000H ; Pointer into the buffer where the next character can be read.
KEYLAST: DS 1, 000H ; KEY LAST VALUE
KEYRPT: DS 1, 000H ; KEY REPEAT COUNTER
DS 64, 0FFH ; Stack space for cold and warm boot.
BOOTSTACK EQU $
;
; Start of CPM entry points.
;
IF $ > 0400H
ERROR "Stack var not aligned, addr=%s, required=%s"; % $, 0400H
ENDIF
ALIGN_NOPS 0400H
;-------------------------------------------------------------------------------
; BOOT
;
; The BOOT entry point gets control from the cold start loader and is
; responsible for basic system initialization, including sending a sign-on
; message, which can be omitted in the first version.
; If the IOBYTE function is implemented, it must be set at this point.
; The various system parameters that are set by the WBOOT entry point must be
; initialized, and control is transferred to the CCP at 3400 + b for further
; processing. Note that register C must be set to zero to select drive A.
;
; NB. This code is executed by the MZF loader. The following code is assembled
; in the header at $1108 to ensure correct startup.
; BOOTSTG1: LD A,TZMM_CPM2 ; Switch to CPM memory mode 2
; OUT (MMCFG), A
; JP QBOOT_ ; Execute cold boot.
; REBOOT: LD A,TZMM_TZFS ; Switch to TZFS memory mode.
; OUT (MMCFG),A
; JP MROMADDR ; Now restart in the SA1510 monitor.
;-------------------------------------------------------------------------------
QBOOT_: DI ; Disable Interrupts and sat mode. NB. Interrupts are physically disabled by 8255 Port C2 set to low.
IM 1
;
LD SP,BOOTSTACK ; Setup to use local stack until CPM takes over.
;
LD HL,0066H ; Set NMI so it doesnt bother us.
LD (HL), 0EDH ; Set to RETN instruction.
INC HL
LD (HL), 045H
;
LD HL,GVARSTART ; Start of global variable area
LD BC,GVAREND-GVARSTART ; Size of global variable area.
XOR A
LD D,A
INIT1: LD (HL),D ; Clear variable memory including stack space.
INC HL
DEC BC
LD A,B
OR C
JR NZ,INIT1
;
LD HL,LVARSTART ; Start of local page variable area
LD BC,LVAREND-LVARSTART ; Size of local page variable area.
XOR A
LD D,A
INIT2: LD (HL),D ; Clear variable memory.
INC HL
DEC BC
LD A,B
OR C
JR NZ,INIT2
;
CALL MODE ; Configure 8255 port C, set Motor Off, VGATE to 1 (off) and INTMSK to 0 (interrupts disabled).
LD A,004H
LD (TEMPW),A ; Setup the tempo for sound output.
INIT3: ; Setup keyboard buffer control.
LD A,0
LD (KEYCOUNT),A ; Set keyboard buffer to empty.
LD HL,KEYBUF
LD (KEYWRITE),HL ; Set write pointer to beginning of keyboard buffer.
LD (KEYREAD),HL ; Set read pointer to beginning of keyboard buffer.
; Setup keyboard rate control and set to CAPSLOCK mode.
; (0 = Off, 1 = CAPSLOCK, 2 = SHIFTLOCK).
LD A,000H ; Initialise key repeater.
LD (KEYRPT),A
LD A,001H
LD (SFTLK),A ; Setup shift lock, default = off.
; Setup the initial cursor, for CAPSLOCK this is a double underscore.
LD A,03EH
LD (FLSDT),A
LD A,080H ; Cursor on (Bit D7=1).
LD (FLASHCTL),A
; Initialise the display, either the Video Module, 40/80 Colour Card or standard 40 column display.
IF BUILD_VIDEOMODULE = 1
IN A, (CPLDINFO) ; Get hardware information.
BIT 3,A
JR Z, INIT80CHAR ; If no video module present then see if the 40/80 column board installed else need to use 40 char mode.
AND 007H
LD D, A
OR MODE_VIDEO_FPGA ; Ensure the video hardware is enabled.
OUT (CPLDCFG),A
LD A, D
OR MODE_80CHAR ; Enable 80 char display.
OUT (VMCTRL),A ; Activate.
LD A, D
CP MODE_MZ80A ; Check to see if this is the MZ80A, if so, change BUS speed.
JR NZ, INIT80END
; LD A, SYSMODE_MZ80B ; Set bus and default CPU speed to 4MHz
; OUT (SYSCTRL),A ; Activate.
JR INIT80END
ENDIF
INIT80CHAR: IF BUILD_80C = 1
LD HL,DSPCTL ; Setup address of display control register latch.
LD A, 128 ; 80 char mode.
LD E,(HL) ; Dummy operation to enable latch write via multivibrator.
LD (HL), A
ENDIF
;
; If no video module and no 40/80 Colour Card then the default will be 40 column display.
;
INIT80END: LD A,016H
CALL PRNT
LD A,071H ; Blue background, white characters in colour mode. Bit 7 is set as a write to bit 7 @ DFFFH selects 80Char mode.
LD HL,ARAM
CALL CLR8
CALL MLDSP
CALL NL
LD DE,CBIOSSIGNON ; Start of sign on message, as devices are detected they are added to the sign on.
CALL MONPRTSTR
CALL BEL ; Beep to indicate startup - for cases where screen is slow to startup.
LD A,0FFH
LD (SWRK),A
LD HL,NUMBERBUF
LD (NUMBERPOS),HL
;
XOR A
LD (IOBYT),A
LD (CDISK),A
; DRVAVAIL flag definition. Version 1.25 - removed ROM Drives and RAM drives as they provided no speed or use benefit compared with SD drives.
;
; 1 = Active.
;
; 7 6 5 4 3 2 1 0
; ^ ^ ^ ^ ^ ^ ^ ^
; | | | | | | | |-- Floppy Drive Present
; | | | | | | |---- ROM Drive Present
; | | | | | |------ SD Card Present
; | | | | |-------- RAM Drive Present
; | | | |----------
; | | |------------
; | |--------------
; |---------------- Drives present
;
; Initialise the disk subsystem.
;
LD A,0 ; No drives yet detected so zero available mask.
SET 2,A ; The SD Card is always present on the I/O processor, we cant run without it..
;
LD DE,SDAVAIL
CALL PRTSTRTMSG
;
CALL DSKINIT ; Initialise the floppy disk subsystem.
JR NZ,STRT5
LD A,(DRVAVAIL)
SET 0,A ; Indicate Floppy drives are available.
LD DE,FDCAVAIL ; Output indicator that FDC drives are available.
CALL PRTSTRTMSG
;
STRT5: LD DE,CBIOSIGNEND ; Terminate the signon message which now includes list of drives detected.
CALL MONPRTSTR
CALL NL
;
; Setup the disk parameter blocks according
; to connected drives and available memory.
;
LD DE,DPBASE ; Base of parameter block.
LD A,0 ; Using scratch area, setup the disk count, pointer to ALV memory and pointer to CSV memory.
LD (CDIRBUF),A
LD HL,CSVALVMEM
LD (CDIRBUF+1),HL
; Add as many SD Drives as RAM permits.
STRT6: CALL ADDSDDRIVE ; Add a drive, NZ return means error, memory limit or max disks reached.
JR NZ,STRT8
JR STRT6
; Setup the 1.44MB Floppy Disk Drives.
;
STRT8: CALL ADDFLPYDRV
CALL ADDFLPYDRV ; No Floppy drives available then skip.
;
LD A,(CDIRBUF)
LD (NDISKS),A ; Setup max number of system disks found on this boot up.
; Setup timer interrupts
LD IX,TIMIN ; Pass the interrupt service handler vector.
LD BC,00000H ; Time starts at 00:00:00 01/01/1980 on initialisation.
LD DE,00000H
LD HL,00000H
CALL TIMESET
; Signon message after all the hardware has been initialised.
LD DE,CPMSIGNON
CALL MONPRTSTR
;
; CP/M init
CPMINIT: LD A,(DRVAVAIL)
BIT 0,A
JR Z,CPMINIT1
;
CALL DSKINIT ; Re-initialise the disk subsystem if available.
XOR A ; 0 to accumulator
LD (HSTACT),A ; Host buffer inactive
LD (UNACNT),A ; Clear unalloc count
;
CPMINIT1: LD A, 0C3H ; C3 IS A JMP INSTRUCTION
LD (00000H), A ; FOR JMP TO WBOOT
LD HL, WBOOTE ; WBOOT ENTRY POINT
LD (00001H), HL ; SET ADDRESS FIELD FOR JMP AT 0
LD (00005H), A ; FOR JMP TO BDOS
LD HL, CPMBDOS ; BDOS ENTRY POINT
LD (00006H), HL ; ADDRESS FIELD OF JUMP AT 5 TO BDOS
LD HL,TIMIN ; Re-install interrupt vector for RTC incase it was overwritten.
LD (00038H),A
LD (00039H),HL
LD BC,CPMUSERDMA
CALL QSETDMA_
;
; check if current disk is valid
LD A,(NDISKS) ; Get the dynamic disk count.
LD L,A
LD A, (CDISK) ; GET CURRENT USER/DISK NUMBER (UUUUDDDD)
AND 00FH ; Isolate the disk number.
CP L ; Drive number ok?
JR C, CPMINIT2 ; Yes, jump (Carry set if A < NDISKS)
LD A, (CDISK) ; No, set disk 0 (previous user)
AND 0F0H
LD (CDISK), A ; Save User/Disk
CPMINIT2: CALL SETDRVMAP ; Refresh the map of physical floppies to CPM drive number.
CALL SETDRVCFG
; LD A,(DISKTYPE)
; OR A
; CALL Z,SELDRIVE ; Select and start disk drive motor if floppy disk.
;
LD A, (CDISK)
LD C, A ; C = current User/Disk for CCP jump (UUUUDDDD)
JP BOOT_ ; Cold boot CPM now that most initialisation is complete. This is a direct jump to the fixed bios area 0xF000
; Method to add an SD drive into the CPM disk definitions.
; If the SD controller hasnt been detected the routine exits without configuration.
ADDSDDRIVE: LD A,(DRVAVAIL)
BIT 2,A
JR Z,ADDSDDRVEX ; No SD interface so skip.
;
; 16MB SD Card Drives.
;
LD BC,0 ; Setup CSV/ALV parameters for a 16MB SD Card drive.
LD (CDIRBUF+3),BC
LD BC,257 ; 2048/8 + 1
LD (CDIRBUF+5),BC
LD BC,DPB4
LD (CDIRBUF+7),BC ; Address of Disk Parameters
LD A,(CDIRBUF)
CP MAXDISKS - 2 ; Make sure we have parameter table entries available to add further drives, ensuring slots for the FDC.
JR Z,ADDSDDRVEX
;
LD (TZSVC_FILE_NO),A ; Indicate the drive number the file will be attached to.
LD A,TZSVC_CMD_ADDSDDRIVE ; I/O processor command to attach a CPM drive to the file number given.
CALL SVC_CMD
OR A
JR NZ,ADDSDDRVEX ; No drive available, skip.
;
; Check that RAM is available to add this drive.
;
LD BC,(CDIRBUF+1)
LD HL,CSVALVEND - 2048/8 + 1 ; Subtract the size of the ALV (CSV has no size for a fixed SD drive)
OR A
SBC HL,BC
JR C,ADDSDDRVEX ; If there is no more space, exit.
CALL COPYDPB ; Add in an SD drive.
XOR A
RET
ADDSDDRVEX: LD A,1
OR A
RET
; Method to add a Floppy drive into the CPM disk definitions table.
; If the Floppy controller hasnt been detected then skip without configuration.
ADDFLPYDRV: LD A,(DRVAVAIL)
BIT 0,A
JR Z,ADDSDDRVEX ; No Floppy drives available then skip.
LD A,(CDIRBUF)
CP MAXDISKS ; Use the disk count to ensure we only add upto 2 FDC drives.
JR Z,ADDSDDRVEX
LD BC,128/4 ; Setup CSV/ALV parameters for a 1.4MB Floppy drive.
LD (CDIRBUF+3),BC
LD BC,91 ; 720/8 + 1
LD (CDIRBUF+5),BC
LD BC,DPB3
LD (CDIRBUF+7),BC ; Address of Disk Parameters
LD BC,(CDIRBUF+1) ; Make sure there is memory available for the FDC drives.
LD HL,CSVALVEND - 720/8 + 1
OR A
SBC HL,BC
JR C,ADDSDDRVEX ; If there is no more space, exit.
CALL COPYDPB ; Add in a floppy drive.
XOR A
RET
; Helper method to print a message with a comma if Bit 7 of A is set.
PRTSTRTMSG: PUSH AF
BIT 7,A
JR Z,PRTCOMMA1
LD A,','
CALL PRNT
PRTCOMMA1: CALL MONPRTSTR
POP AF
SET 7,A
LD (DRVAVAIL),A
RET
;-------------------------------------------------------------------------------
; WBOOT
;
; The WBOOT entry point gets control when a warm start occurs.
; A warm start is performed whenever a user program branches to location
; 0000H, or when the CPU is reset from the front panel. The CP/M system must
; be loaded from the first two tracks of drive A up to, but not including,
; the BIOS, or CBIOS, if the user has completed the patch. System parameters
; must be initialized as follows:
;
; location 0,1,2
; Set to JMP WBOOT for warm starts (000H: JMP 4A03H + b)
;
; location 3
; Set initial value of IOBYTE, if implemented in the CBIOS
;
; location 4
; High nibble = current user number, low nibble = current drive
;
; location 5,6,7
; Set to JMP BDOS, which is the primary entry point to CP/M for transient
; programs. (0005H: JMP 3C06H + b)
;
; Refer to Section 6.9 for complete details of page zero use. Upon completion
; of the initialization, the WBOOT program must branch to the CCP at 3400H+b
; to restart the system.
; Upon entry to the CCP, register C is set to the drive to select after system
; initialization. The WBOOT routine should read location 4 in memory, verify
; that is a legal drive, and pass it to the CCP in register C.
;-------------------------------------------------------------------------------
QWBOOT_: DI
;
LD SP,BOOTSTACK
; Reload the CCP and BDOS from SD.
LD A,TZSVC_CMD_LOADBDOS ; I/O processor command to load the CCP+BDOS
LD HL,CBASE
LD (TZSVC_LOADADDR),HL ; Address where to load the CCP+BDOS
LD HL,CPMBIOS-CBASE
LD (TZSVC_LOADSIZE),HL ; Size of the CCP+BDOS area.
CALL SVC_CMD
OR A
JP Z, CPMINIT ; Initialise CPM and run.
LD DE,NOBDOS
CALL MONPRTSTR
WBOOT2: JR WBOOT2 ; Cannot continue, no BDOS/CCP.
;-------------------------------------------------------------------------------
; CONOUT
;
; The character is sent from register C to the console output device.
; The character is in ASCII, with high-order parity bit set to zero. You
; might want to include a time-out on a line-feed or carriage return, if the
; console device requires some time interval at the end of the line (such as
; a TI Silent 700 terminal). You can filter out control characters that cause
; the console device to react in a strange way (CTRL_Z causes the Lear-
; Siegler terminal to clear the screen, for example).
;-------------------------------------------------------------------------------
QCONOUT_: LD A,C
CALL ANSITERM
RET
;-------------------------------------------------------------------------------
; CONIN
;
; The next console character is read into register A, and the parity bit is
; set, high-order bit, to zero. If no console character is ready, wait until
; a character is typed before returning.
;-------------------------------------------------------------------------------
QCONIN_: CALL GETKY
RET
;-------------------------------------------------------------------------------
; CONST
;
; You should sample the status of the currently assigned console device and
; return 0FFH in register A if a character is ready to read and 00H in
; register A if no console characters are ready.
;-------------------------------------------------------------------------------
QCONST_: CALL CHKKY
RET
;-------------------------------------------------------------------------------
; READER
;
; The next character is read from the currently assigned reader device into
; register A with zero parity (high-order bit must be zero); an end-of-file
; condition is reported by returning an ASCII CTRL_Z(1AH).
;-------------------------------------------------------------------------------
QREADER_: LD A, 01AH ; Reader not implemented.
RET
;-------------------------------------------------------------------------------
; PUNCH
;
; The character is sent from register C to the currently assigned punch
; device. The character is in ASCII with zero parity.
;-------------------------------------------------------------------------------
QPUNCH_: RET ; Punch not implemented
;-------------------------------------------------------------------------------
; LIST
;
; The character is sent from register C to the currently assigned listing
; device. The character is in ASCII with zero parity bit.
;-------------------------------------------------------------------------------
QLIST_: RET
;-------------------------------------------------------------------------------
; LISTST
;
; You return the ready status of the list device used by the DESPOOL program
; to improve console response during its operation. The value 00 is returned
; in A if the list device is not ready to accept a character and 0FFH if a
; character can be sent to the printer. A 00 value should be returned if LIST
; status is not implemented.
;-------------------------------------------------------------------------------
QLISTST_: XOR A ; Not implemented.
RET
;-------------------------------------------------------------------------------
; HOME
;
; The disk head of the currently selected disk (initially disk A) is moved to
; the track 00 position. If the controller allows access to the track 0 flag
; from the drive, the head is stepped until the track 0 flag is detected. If
; the controller does not support this feature, the HOME call is translated
; into a call to SETTRK with a parameter of 0.
;-------------------------------------------------------------------------------
QHOME_: LD BC,00000H
;-------------------------------------------------------------------------------
; SETTRK
;
; Register BC contains the track number for subsequent disk accesses on the
; currently selected drive. The sector number in BC is the same as the number
; returned from the SECTRN entry point. You can choose to seek the selected
; track at this time or delay the seek until the next read or write actually
; occurs. Register BC can take on values in the range 0-76 corresponding to
; valid track numbers for standard floppy disk drives and 0-65535 for
; nonstandard disk subsystems.
;-------------------------------------------------------------------------------
QSETTRK_: LD (SEKTRK),BC ; Set track passed from BDOS in register BC.
RET
;-------------------------------------------------------------------------------
; SETSEC
;
; Register BC contains the sector number, 1 through 26, for subsequent disk
; accesses on the currently selected drive. The sector number in BC is the
; same as the number returned from the SECTRAN entry point. You can choose to
; send this information to the controller at this point or delay sector
; selection until a read or write operation occurs.
;-------------------------------------------------------------------------------
QSETSEC_: LD A,C ; Set sector passed from BDOS in register BC.
LD (SEKSEC), A
RET
;-------------------------------------------------------------------------------
; SETDMA
;
; Register BC contains the DMA (Disk Memory Access) address for subsequent
; read or write operations. For example, if B = 00H and C = 80H when SETDMA
; is called, all subsequent read operations read their data into 80H through
; 0FFH and all subsequent write operations get their data from 80H through
; 0FFH, until the next call to SETDMA occurs. The initial DMA address is
; assumed to be 80H. The controller need not actually support Direct Memory
; Access. If, for example, all data transfers are through I/O ports, the
; CBIOS that is constructed uses the 128 byte area starting at the selected
; DMA address for the memory buffer during the subsequent read or write
; operations.
;-------------------------------------------------------------------------------
QSETDMA_: LD (DMAADDR),BC
RET
;-------------------------------------------------------------------------------
; SELDSK
;
; The disk drive given by register C is selected for further operations,
; where register C contains 0 for drive A, 1 for drive B, and so on up to 15
; for drive P (the standard CP/M distribution version supports four drives).
; On each disk select, SELDSK must return in HL the base address of a 16-byte
; area, called the Disk Parameter Header, described in Section 6.10.
; For standard floppy disk drives, the contents of the header and associated
; tables do not change; thus, the program segment included in the sample
; CBIOS performs this operation automatically.
;
; If there is an attempt to select a nonexistent drive, SELDSK returns
; HL = 0000H as an error indicator. Although SELDSK must return the header
; address on each call, it is advisable to postpone the physical disk select
; operation until an I/O function (seek, read, or write) is actually
; performed, because disk selects often occur without ultimately performing
; any disk I/O, and many controllers unload the head of the current disk
; before selecting the new drive. This causes an excessive amount of noise
; and disk wear. The least significant bit of register E is zero if this is
; the first occurrence of the drive select since the last cold or warm start.
;-------------------------------------------------------------------------------
QSELDSK_: LD HL, 00000H ; HL = error code
LD A,(NDISKS)
LD B,A
LD A,C
CP B
JR NC,SELDSK1 ; Ensure we dont select a non existant disk.
LD (CDISK),A ; Setup drive.
SELDSK0: CALL SETDRVCFG
LD A,(DISKTYPE)
CP DSKTYP_SDC
JR Z,SELSDCDSK ; Select SD Card.
; If it is not an SD drive then it must be a floppy disk.
LD A,C
JR CALCHL
SELDSK1: RET
; For SD Cards, check that the SD Card is present, otherwise illegal disk.
SELSDCDSK: LD A,(DRVAVAIL)
BIT 2,A
JR Z,SELDSK1 ; No SD Card drives available then skip.
LD A,C
; Code for blocking and deblocking algorithm
; (see CP/M 2.2 Alteration Guide p.34 and APPENDIX G)
CALCHL: LD (SEKDSK),A
RLC A ; *2
RLC A ; *4
RLC A ; *8
RLC A ; *16
LD HL,DPBASE
LD B,0
LD C,A
ADD HL,BC
JR SELDSK1
;-------------------------------------------------------------------------------
; SECTRAN
;
; Logical-to-physical sector translation is performed to improve the overall
; response of CP/M. Standard CP/M systems are shipped with a skew factor of
; 6, where six physical sectors are skipped between each logical read
; operation. This skew factor allows enough time between sectors for most
; programs to load their buffers without missing the next sector. In
; particular computer systems that use fast processors, memory, and disk
; subsystems, the skew factor might be changed to improve overall response.
; However, the user should maintain a single-density IBM-compatible version
; of CP/M for information transfer into and out of the computer system, using
; a skew factor of 6.
;
; In general, SECTRAN receives a logical sector number relative to zero in BC
; and a translate table address in DE. The sector number is used as an index
; into the translate table, with the resulting physical sector number in HL.
; For standard systems, the table and indexing code is provided in the CBIOS
; and need not be changed.
;-------------------------------------------------------------------------------
QSECTRN_: LD H,B
LD L,C
RET
;-------------------------------------------------------------------------------
; READ
;
; Assuming the drive has been selected, the track has been set, and the DMA
; address has been specified, the READ subroutine attempts to read one sector
; based upon these parameters and returns the following error codes in
; register A:
;
; 0 - no errors occurred
; 1 - non recoverable error condition occurred
;
; Currently, CP/M responds only to a zero or nonzero value as the return
; code. That is, if the value in register A is 0, CP/M assumes that the disk
; operation was completed properly. If an error occurs the CBIOS should
; attempt at least 10 retries to see if the error is recoverable. When an
; error is reported the BDOS prints the message BDOS ERR ON x: BAD SECTOR.
; The operator then has the option of pressing a carriage return to ignore
; the error, or CTRL_C to abort.
;-------------------------------------------------------------------------------
;
; Code for blocking and deblocking algorithm
; (see CP/M 2.2 Alteration Guide p.34 and APPENDIX G)
;
QREAD_: XOR A
LD (UNACNT), A
LD A, 1
LD (READOP), A ; read operation
LD (RSFLAG), A ; must read data
LD A, WRUAL
LD (WRTYPE), A ; treat as unalloc
CALL RWOPER ; to perform the read, returns with A=0 no errors or A > 0 errors.
RET
;-------------------------------------------------------------------------------
; WRITE
;
; Data is written from the currently selected DMA address to the currently
; selected drive, track, and sector. For floppy disks, the data should be
; marked as nondeleted data to maintain compatibility with other CP/M
; systems. The error codes given in the READ command are returned in register
; A, with error recovery attempts as described above.
;-------------------------------------------------------------------------------
;
; Code for blocking and deblocking algorithm
; (see CP/M 2.2 Alteration Guide p.34 and APPENDIX G)
;
QWRITE_: XOR A ; 0 to accumulator
LD (READOP), A ; not a read operation
LD A, C ; write type in c
LD (WRTYPE), A
CP WRUAL ; write unallocated?
JR NZ, CHKUNA ; check for unalloc
; write to unallocated, set parameters
LD A, BLKSIZ/128 ; next unalloc recs
LD (UNACNT), A
LD A, (SEKDSK) ; disk to seek
LD (UNADSK), A ; unadsk = sekdsk
LD HL, (SEKTRK)
LD (UNATRK), HL ; unatrk = sectrk
LD A, (SEKSEC)
LD (UNASEC), A ; unasec = seksec
; check for write to unallocated sector
CHKUNA: LD A,(UNACNT) ; any unalloc remain?
OR A
JR Z, ALLOC ; skip if not
; more unallocated records remain
DEC A ; unacnt = unacnt-1
LD (UNACNT), A
LD A, (SEKDSK) ; same disk?
LD HL, UNADSK
CP (HL) ; sekdsk = unadsk?
JP NZ, ALLOC ; skip if not
; disks are the same
LD HL, UNATRK
CALL SEKTRKCMP ; sektrk = unatrk?
JP NZ, ALLOC ; skip if not
; tracks are the same
LD A, (SEKSEC) ; same sector?
LD HL, UNASEC
CP (HL) ; seksec = unasec?
JP NZ, ALLOC ; skip if not
; match, move to next sector for future ref
INC (HL) ; unasec = unasec+1
LD A, (HL) ; end of track?
CP CPMSPT ; count CP/M sectors
JR C, NOOVF ; skip if no overflow
; overflow to next track
LD (HL), 0 ; unasec = 0
LD HL, (UNATRK)
INC HL
LD (UNATRK), HL ; unatrk = unatrk+1
; match found, mark as unnecessary read
NOOVF: XOR A ; 0 to accumulator
LD (RSFLAG), A ; rsflag = 0
JR ALLOC2 ; to perform the write
; not an unallocated record, requires pre-read
ALLOC: XOR A ; 0 to accum
LD (UNACNT), A ; unacnt = 0
INC A ; 1 to accum
ALLOC2: LD (RSFLAG), A ; rsflag = 1
CALL RWOPER
RET
;-------------------------------------------------------------------------------
; SERVICE COMMAND METHODS
;-------------------------------------------------------------------------------
; Method to send a command to the I/O processor and verify it is being acted upon.
; The method, after sending the command, polls the service structure result to see if the I/O processor has updated it. If it doesnt update the result
; then after a period of time the command is resent. After a number of retries the command aborts with error. This is needed in case of the I/O processor crashing
; we dont want the host to lock up.
;
; Inputs:
; A = Command.
; Outputs:
; A = 0 - Success, command being processed.
; A = 1 - Failure, no contact with I/O processor.
; A = 2 - Failure, no result from I/O processor, it could have crashed or SD card removed!
SVC_CMD: DI
PUSH BC
LD (TZSVCCMD), A ; Load up the command into the service record.
LD A,TZSVC_STATUS_REQUEST
LD (TZSVCRESULT),A ; Set the service structure result to REQUEST, if this changes then the K64 is processing.
LD BC, TZSVCWAITIORETRIES ; Safety in case the IO request wasnt seen by the I/O processor, if we havent seen a response in the service
SVC_CMD1: PUSH BC
LD A,(TZSVCCMD)
OUT (SVCREQ),A ; Make the service request via the service request port.
LD BC,0
SVC_CMD2: LD A,(TZSVCRESULT)
CP TZSVC_STATUS_REQUEST ; I/O processor when it recognises the request sets the status to PROCESSING or gives a result, if this hasnt occurred the the K64F hasnt begun processing.
JR NZ, SVC_CMD3
DEC BC
LD A,B
OR C
JR NZ, SVC_CMD2
POP BC
DEC BC
LD A,B
OR C
JR NZ,SVC_CMD1 ; Retry sending the I/O command.
;
PUSH DE
LD DE,SVCIOERR
CALL MONPRTSTR
POP DE
LD A,1 ; No response, error.
EI
RET
SVC_CMD3: POP BC
;
LD BC,TZSVCWAITCOUNT ; Number of loops to wait for a response before setting error.
SVC_CMD4: PUSH BC
LD BC,0
SVC_CMD5: LD A,(TZSVCRESULT)
CP TZSVC_STATUS_PROCESSING ; Wait until the I/O processor sets the result, again timeout in case it locks up.
JR NZ, SVC_CMD6
DEC BC
LD A,B
OR C
JR NZ,SVC_CMD5
POP BC
DEC BC
LD A,B
OR C
JR NZ,SVC_CMD4 ; Retry polling for result.
;
PUSH DE
LD DE,SVCRESPERR
CALL MONPRTSTR
POP DE
LD A,2
EI
RET
SVC_CMD6: XOR A ; Success.
POP BC
POP BC
EI
RET
;-------------------------------------------------------------------------------
; END OF SERVICE COMMAND METHODS
;-------------------------------------------------------------------------------
; Method to clear memory either to 0 or a given pattern.
;
CLR8Z: XOR A
CLR8: LD BC,00800H
CLRMEM: PUSH DE
LD D,A
L09E8: LD (HL),D
INC HL
DEC BC
LD A,B
OR C
JR NZ,L09E8
POP DE
RET
;-------------------------------------------------------------------------------
; START OF SD CARD DRIVE FUNCTIONALITY
;-------------------------------------------------------------------------------
; Method to read a sector from the SD Card.
; All reads occur in a 512byte sector.
;
; CPM Provides us with a track and sector, take these and pass them to the I/O
; processor which will map the params into the file associated with the drive.
;
; Inputs: (HSTTRK) - 16bit track number.
; (HSTSEC) - 8bit sector number.
; (CDISK) - Disk drive number.
SDCREAD: LD HL,(HSTTRK) ; 16bit track.
LD (TZSVC_TRACK_NO),HL
LD H,0 ; Only use 8 bit sector numbers at the moment.
LD A,(HSTSEC)
LD L,A
LD (TZSVC_SECTOR_NO),HL
LD A,(CDISK) ; Disk drive no.
LD (TZSVC_FILE_NO),A
;
LD A,TZSVC_CMD_READSDDRIVE
CALL SVC_CMD
OR A
JP READHST3
; Method to write a sector for CPM using its track/sector addressing.
; All writes occur in a 512byte sector.
;
; Inputs: (HSTTRK) - 16bit track number.
; (HSTSEC) - 8bit sector number.
; (CDISK) - Disk drive number.
; Outputs: A = 1 - Error.
; A = 0 - Success.
SDCWRITE: LD HL,(HSTTRK) ; 16bit track.
LD (TZSVC_TRACK_NO),HL
LD H,0 ; Only use 8 bit sector numbers at the moment.
LD A,(HSTSEC)
LD L,A
LD (TZSVC_SECTOR_NO),HL
LD A,(CDISK) ; Disk drive no.
LD (TZSVC_FILE_NO),A
;
LD A,TZSVC_CMD_WRITESDDRIVE
CALL SVC_CMD
OR A
JP WRITEHST3
;-------------------------------------------------------------------------------
; END OF SD CARD DRIVE FUNCTIONALITY
;-------------------------------------------------------------------------------
;-------------------------------------------------------------------------------
; START OF CPM DEBLOCKING ALGORITHM
;-------------------------------------------------------------------------------
;-------------------------------------------------------------------------------
; RWOPER
;
; The common blocking/deblocking algorithm provided by DR to accommodate devices
; which have sector sizes bigger than the CPM 128byte standard sector.
; In this implementation a sector size of 512 has been chosen regardless of
; what the underlying hardware uses (ie. FDC is 256 byte for a standard MZ800
; format disk).
;-------------------------------------------------------------------------------
RWOPER: XOR A ; zero to accum
LD (ERFLAG), A ; no errors (yet)
LD A, (SEKSEC) ; compute host sector
OR A ; carry = 0
RRA ; shift right
OR A ; carry = 0
RRA ; shift right
LD (SEKHST), A ; host sector to seek
; active host sector?
LD HL, HSTACT ; host active flag
LD A, (HL)
LD (HL), 1 ; always becomes 1
OR A ; was it already?
JR Z, FILHST ; fill host if not
; host buffer active, same as seek buffer?
LD A, (SEKDSK)
LD HL, HSTDSK ; same disk?
CP (HL) ; sekdsk = hstdsk?
JR NZ, NOMATCH
; same disk, same track?
LD HL, HSTTRK
CALL SEKTRKCMP ; sektrk = hsttrk?
JR NZ, NOMATCH
; same disk, same track, same buffer?
LD A, (SEKHST)
LD HL, HSTSEC ; sekhst = hstsec?
CP (HL)
JR Z, MATCH ; skip if match
; proper disk, but not correct sector
NOMATCH: LD A, (HSTWRT) ; host written?
OR A
CALL NZ, WRITEHST ; clear host buff
; may have to fill the host buffer
FILHST: LD A, (SEKDSK)
LD (HSTDSK), A
LD HL, (SEKTRK)
LD (HSTTRK), HL
LD A, (SEKHST)
LD (HSTSEC), A
LD A, (RSFLAG) ; need to read?
OR A
CALL NZ, READHST ; yes, if 1
OR A
JR NZ,RWEXIT ; If A > 0 then read error occurred.
XOR A ; 0 to accum
LD (HSTWRT), A ; no pending write
; copy data to or from buffer
MATCH: LD A, (SEKSEC) ; mask buffer number
AND SECMSK ; least signif bits
LD L, A ; ready to shift
LD H, 0 ; double count
ADD HL, HL
ADD HL, HL
ADD HL, HL
ADD HL, HL
ADD HL, HL
ADD HL, HL
ADD HL, HL
; hl has relative host buffer address
LD DE, HSTBUF
ADD HL, DE ; hl = host address
EX DE, HL ; now in DE
LD HL, (DMAADDR) ; get/put CP/M data
LD C, 128 ; length of move
LD A, (READOP) ; which way?
OR A
JR NZ, RWMOVE ; skip if read
; write operation, mark and switch direction
LD A, 1
LD (HSTWRT), A ; hstwrt = 1
EX DE, HL ; source/dest swap
; c initially 128, DE is source, HL is dest
RWMOVE: LD A,(INVFDCDATA) ; Check to see if FDC data needs to be inverted. MB8866 controller works on negative logic.
RRCA
JR NC,RWMOVE3
RWMOVE2: CALL MEMCPYINV
JR RWMOVE4
RWMOVE3: CALL MEMCPY
; data has been moved to/from host buffer
RWMOVE4: LD A, (WRTYPE) ; write type
CP WRDIR ; to directory?
LD A, (ERFLAG) ; in case of errors
RET NZ ; no further processing
; clear host buffer for directory write
OR A ; errors?
RET NZ ; skip if so
XOR A ; 0 to accum
LD (HSTWRT), A ; buffer written
CALL WRITEHST
RWEXIT: LD A, (ERFLAG)
RET
; utility subroutine for 16-bit compare
; HL = .unatrk or .hsttrk, compare with sektrk
SEKTRKCMP: EX DE, HL
LD HL, SEKTRK
LD A, (DE) ; low byte compare
CP (HL) ; same?
RET NZ ; return if not
; low bytes equal, test high 1s
INC DE
INC HL
LD A, (DE)
CP (HL) ; sets flags
RET
;------------------------------------------------------------------------------------------------
; Read physical sector from host
;
; Read data from the floppy disk or SD. A = 1 if an error occurred.
;------------------------------------------------------------------------------------------------
READHST: PUSH BC
PUSH HL
LD A,(DISKTYPE)
CP DSKTYP_SDC ; Is the drive an SD Card?
JP Z,SDCREAD
READHST2: CALL DSKREAD ; Floppy card, use the FDC Controller.
READHST3: POP HL
POP BC
RET
;------------------------------------------------------------------------------------------------
; Write physical sector to host
;
; Write data to the floppy disk or SD. A = 1 if an error occurred.
;------------------------------------------------------------------------------------------------
WRITEHST: PUSH BC
PUSH HL
LD A,(DISKTYPE)
CP DSKTYP_SDC ; Is the drive an SD Card?
JP Z,SDCWRITE
CALL DSKWRITE
WRITEHST3: POP HL
POP BC
RET
WRITEHST4: LD A,1 ; Error, cannot write.
JR WRITEHST3
;-------------------------------------------------------------------------------
; END OF CPM DEBLOCKING ALGORITHM
;-------------------------------------------------------------------------------
;-------------------------------------------------------------------------------
; START OF AUDIO CONTROLLER FUNCTIONALITY
;-------------------------------------------------------------------------------
; Melody function.
MLDY: PUSH BC
PUSH DE
PUSH HL
LD A,002H
LD (OCTV),A
LD B,001H
MLD1: LD A,(DE)
CP 00DH
JR Z,MLD4
CP 0C8H
JR Z,MLD4
CP 0CFH
JR Z,MLD2
CP 02DH
JR Z,MLD2
CP 02BH
JR Z,MLD3
CP 0D7H
JR Z,MLD3
CP 023H
LD HL,MTBL
JR NZ,MLD1A
LD HL,M?TBL
INC DE
MLD1A: CALL ONPU
JR C,MLD1
CALL RYTHM
JR C,MLD5
CALL MLDST
LD B,C
JR MLD1
MLD2: LD A,003H
MLD2A: LD (OCTV),A
INC DE
JR MLD1
MLD3: LD A,001H
JR MLD2A
MLD4: CALL RYTHM
MLD5: PUSH AF
CALL MLDSP
POP AF
POP HL
POP DE
POP BC
RET
ONPU: PUSH BC
LD B,008H
LD A,(DE)
ONP1A: CP (HL)
JR Z,ONP2
INC HL
INC HL
INC HL
DJNZ ONP1A
SCF
INC DE
POP BC
RET
ONP2: INC HL
PUSH DE
LD E,(HL)
INC HL
LD D,(HL)
EX DE,HL
LD A,H
OR A
JR Z,ONP2B
LD A,(OCTV)
ONP2A: DEC A
JR Z,ONP2B
ADD HL,HL
JR ONP2A
ONP2B: LD (RATIO),HL
LD HL,OCTV
LD (HL),002H
DEC HL
POP DE
INC DE
LD A,(DE)
LD B,A
AND 0F0H
CP 030H
JR Z,ONP2C
LD A,(HL)
JR ONP2D
ONP2C: INC DE
LD A,B
AND 00FH
LD (HL),A
ONP2D: LD HL,OPTBL
ADD A,L
LD L,A
LD C,(HL)
LD A,(TEMPW)
LD B,A
XOR A
JP MLDDLY
RYTHM: LD HL,KEYPA
LD (HL),0F0H
INC HL
LD A,(HL)
AND 081H
JR NZ,L02D5
SCF
RET
L02D5: LD A,(SUNDG)
RRCA
JR C,L02D5
L02DB: LD A,(SUNDG)
RRCA
JR NC,L02DB
DJNZ L02D5
XOR A
RET
MLDST: LD HL,(RATIO)
LD A,H
OR A
JR Z,MLDSP
PUSH DE
EX DE,HL
LD HL,CONT0
LD (HL),E
LD (HL),D
LD A,001H
POP DE
JR L02C4
MLDSP: LD A,034H
LD (CONTF),A
XOR A
L02C4: LD (SUNDG),A
RET
MLDDLY: ADD A,C
DJNZ MLDDLY
POP BC
LD C,A
XOR A
RET
TEMPO: PUSH AF
PUSH BC
AND 00FH
LD B,A
LD A,008H
SUB B
LD (TEMPW),A
POP BC
POP AF
RET
;
; Method to sound the bell, basically play a constant tone.
;
BEL: PUSH DE
LD DE,00DB1H
CALL MLDY
POP DE
RET
;
; Melody (note) lookup table.
;
MTBL: DB 043H
DB 077H
DB 007H
DB 044H
DB 0A7H
DB 006H
DB 045H
DB 0EDH
DB 005H
DB 046H
DB 098H
DB 005H
DB 047H
DB 0FCH
DB 004H
DB 041H
DB 071H
DB 004H
DB 042H
DB 0F5H
DB 003H
DB 052H
DB 000H
DB 000H
M?TBL: DB 043H
DB 00CH
DB 007H
DB 044H
DB 047H
DB 006H
DB 045H
DB 098H
DB 005H
DB 046H
DB 048H
DB 005H
DB 047H
DB 0B4H
DB 004H
DB 041H
DB 031H
DB 004H
DB 042H
DB 0BBH
DB 003H
DB 052H
DB 000H
DB 000H
OPTBL: DB 001H
DB 002H
DB 003H
DB 004H
DB 006H
DB 008H
DB 00CH
DB 010H
DB 018H
DB 020H
;-------------------------------------------------------------------------------
; END OF AUDIO CONTROLLER FUNCTIONALITY
;-------------------------------------------------------------------------------
;-------------------------------------------------------------------------------
; START OF RTC FUNCTIONALITY (INTR HANDLER IN MAIN CBIOS)
;-------------------------------------------------------------------------------
;
; BC:DE:HL contains the time in milliseconds (100msec resolution) since 01/01/1980. In IX is held the interrupt service handler routine address for the RTC.
; HL contains lower 16 bits, DE contains middle 16 bits, BC contains upper 16bits, allows for a time from 00:00:00 to 23:59:59, for > 500000 days!
; NB. Caller must disable interrupts before calling this method.
TIMESET: LD (TIMESEC),HL ; Load lower 16 bits.
EX DE,HL
LD (TIMESEC+2),HL ; Load middle 16 bits.
PUSH BC
POP HL
LD (TIMESEC+4),HL ; Load upper 16 bits.
;
LD HL,CONTF
LD (HL),074H ; Set Counter 1, read/load lsb first then msb, mode 2 rate generator, binary
LD (HL),0B0H ; Set Counter 2, read/load lsb first then msb, mode 0 interrupt on terminal count, binary
DEC HL
LD DE,TMRTICKINTV ; 100Hz coming into Timer 2 from Timer 1, set divisor to set interrupts per second.
LD (HL),E ; Place current time in Counter 2
LD (HL),D
DEC HL
IF BUILD_MZ80A = 1
LD (HL),03BH ; Place divisor in Counter 1, = 315, thus 31500/315 = 100
LD (HL),001H
ENDIF
IF BUILD_MZ700 = 1
LD (HL),09CH ; Place divisor in Counter 1, = 156, thus 15611/156 = 100
LD (HL),000H
ENDIF
NOP
NOP
NOP
;
LD A, 0C3H ; Install the interrupt vector for when interrupts are enabled.
LD (00038H),A
LD (00039H),IX
RET
; Time Read;
; Returns BC:DE:HL where HL is lower 16bits, DE is middle 16bits and BC is upper 16bits of milliseconds since 01/01/1980.
TIMEREAD: LD HL,(TIMESEC+4)
PUSH HL
POP BC
LD HL,(TIMESEC+2)
EX DE,HL
LD HL,(TIMESEC)
RET
;-------------------------------------------------------------------------------
; END OF RTC FUNCTIONALITY
;-------------------------------------------------------------------------------
;-------------------------------------------------------------------------------
; START OF FDC CONTROLLER FUNCTIONALITY
;-------------------------------------------------------------------------------
;------------------------------------------------------------------------------------------------
; Initialise drive and reset flags, Set motor off
;------------------------------------------------------------------------------------------------
DSKINIT: XOR A
OUT (FDC_MOTOR),A ; Motor off
LD (TRK0FD1),A ; Track 0 flag drive 1
LD (TRK0FD2),A ; Track 0 flag drive 2
LD (TRK0FD3),A ; Track 0 flag drive 3
LD (TRK0FD4),A ; Track 0 flag drive 4
LD (MOTON),A ; Motor on flag
LD (MTROFFTIMER),A ; Clear the down counter for motor off.
LD A,(FDCJMP1) ; Check to see if the FDC AFI ROM is installed, use this as
AND 0DFH ; Byte can be either DD or FD dependent on the FDC wait line,
CP 0DDH ; so check both to determine if the FDC is present.
RET
; Function to create a mapping table between a CPM disk and a physical disk.
SETDRVMAP: PUSH HL
PUSH DE
PUSH BC
; Zero out the map.
LD B,MAXDISKS
LD HL,DISKMAP
LD A,0FFH
SETDRVMAP1: LD (HL),A
INC HL
DJNZ SETDRVMAP1
LD HL,DISKMAP ; Place in the Map for next drive.
; Now go through each disk from the Disk Parameter Base list.
LD B,0 ; Disk number count = CDISK.
LD DE,0 ; Physical disk number, D = FDC, E = SDC.
SETDRVMAP2: LD A,B
CP MAXDISKS
JR Z,SETDRVMAP6
INC B
PUSH HL
PUSH DE
PUSH BC
; For the Disk in A, find the parameter table.
RLC A ; *2
RLC A ; *4
RLC A ; *8
RLC A ; *16
LD HL,DPBASE ; Base of disk description block.
LD B,0
LD C,A
ADD HL,BC ; HL contains address of actual selected disk block.
LD C,10
ADD HL,BC ; HL contains address of pointer to disk parameter block.
LD E,(HL)
INC HL
LD D,(HL) ; DE contains address of disk parameter block.
EX DE,HL
LD A,(HL)
LD E,A
LD BC,15
ADD HL,BC ; Move to configuuration byte which identifies the disk type.
;
POP BC
POP DE
LD A,(HL)
POP HL
BIT 4,A ; Disk type = FDC
JR Z,SETDRVMAP4 ; Is this an FDC controlled disk, if so store the mapping number in the map unchanged.
;
BIT 3,A ; Is this an SD Card disk, if so, add 080H to the mapping number and store.
JR Z,SETDRVMAP5
LD A,E
OR 080H
INC E
JR SETDRVMAP5
;
SETDRVMAP4: LD A,D
INC D
SETDRVMAP5: LD (HL),A
INC HL
JR SETDRVMAP2
;
SETDRVMAP6: POP BC
POP DE
POP HL
RET
; Function to setup the drive parameters according to the CFG byte in the disk parameter block.
SETDRVCFG: PUSH HL
PUSH DE
PUSH BC
LD A,(CDISK)
RLC A ; *2
RLC A ; *4
RLC A ; *8
RLC A ; *16
LD HL,DPBASE ; Base of disk description block.
LD B,0
LD C,A
ADD HL,BC ; HL contains address of actual selected disk block.
LD C,10
ADD HL,BC ; HL contains address of pointer to disk parameter block.
LD E,(HL)
INC HL
LD D,(HL) ; DE contains address of disk parameter block.
EX DE,HL
LD A,(HL)
LD E,A
LD BC,15
ADD HL,BC ; Move to configuration byte.
XOR A
BIT 2,(HL)
JR Z,SETDRV0
INC A
SETDRV0: LD (INVFDCDATA),A ; Data inversion is set according to drive parameter.
LD A,4
BIT 1,(HL)
JR Z,SETDRV1
LD A,2
BIT 0,(HL)
JR Z,SETDRV1
LD A,1
SETDRV1: LD (SECTORCNT),A ; Set the disk sector size.
LD D,A
CP 4
LD A,E
JR Z,SETDRV1A
OR A
RR A
LD E,A
LD A,D
CP 2
LD A,E
JR Z,SETDRV1A
OR A
RR A ; Convert sectors per track from 128 bytes to 256 byte sectors.
SETDRV1A: INC A ; Add 1 to ease comparisons.
LD (SECPERTRK),A ; Only cater for 8bit, ie. 256 sectors.
DEC A
OR A
RR A
INC A ; Add 1 to ease comparisons.
LD (SECPERHEAD),A ; Convert sectors per track to sectors per head.
;
XOR A ; Disk type = FDC
BIT 4,(HL)
JR Z,SETDRV2
LD A,DSKTYP_SDC ; Disk type = SD Card
SETDRV2: LD (DISKTYPE),A
POP BC
POP DE
POP HL
RET
; Method to get the current disk drive mapped to the correct controller.
; The CPM CDISK is mapped via MAPDISK[CDISK] and the result:
; Bit 7 = 1 - SD Card drive.
; BIT 7:6 = 00 - Floppy drive.
GETMAPDSK: PUSH HL
PUSH BC
LD A,(CDISK)
LD HL,DISKMAP
LD C,A
LD B,0
ADD HL,BC
LD A,(HL) ; Get the physical number after mapping from the CDISK.
POP BC
POP HL
RET
; Select FDC drive (make active) based on value in DISKMAP[CDISK].
SELDRIVE: CALL GETMAPDSK
CP 040H ; Anything with bit 6 or 7 set is not an FDC drive.
RET NC ; This isnt a physical floppy disk, no need to perform any actions, exit.
;
LD (FDCDISK),A
CALL DSKMTRON ; yes, set motor on and wait
LD A,(FDCDISK) ; select drive no
OR 084H
OUT (FDC_MOTOR),A ; Motor on for drive 0-3
XOR A
LD (FDCCMD),A ; clr latest FDC command byte
LD HL,00000H
SELDRV2: DEC HL
LD A,H
OR L
JP Z,SELDRVERR ; Reset and print message that this is not a valid disk.
IN A,(FDC_STR) ; Status register.
CPL
RLCA
JR C,SELDRV2 ; Wait on Drive Ready Bit (bit 7)
LD A,(FDCDISK) ; Drive number
LD C,A
LD HL,TRK0FD1 ; 1 track 0 flag for each drive
LD B,000H
ADD HL,BC ; Compute related flag 1002/1003/1004/1005
BIT 0,(HL)
JR NZ,SELDRV3 ; If the drive hasnt been intialised to track 0, intialise and set flag.
CALL DSKSEEKTK0 ; Seek track 0.
SET 0,(HL) ; Set bit 0 of trk 0 flag
SELDRV3: CALL SETDRVCFG
RET
; Turn disk motor on if not already running.
DSKMTRON: LD A,255 ; Ensure motor is kept running whilst we read/write.
LD (MTROFFTIMER),A
LD A,(MOTON) ; Test to see if motor is on, if it isnt, switch it on.
RRCA
JR NC, DSKMOTORON
RET
DSKMOTORON: PUSH BC
LD A,080H
OUT (FDC_MOTOR),A ; Motor on
LD B,010H ;
DSKMTR2: CALL MTRDELAY ;
DJNZ DSKMTR2 ; Wait until becomes ready.
LD A,001H ; Set motor on flag.
LD (MOTON),A ;
POP BC
RET
FDCDLY1: PUSH DE
LD DE,00007H
JP MTRDEL2
MTRDELAY: PUSH DE
LD DE,01013H
MTRDEL2: DEC DE
LD A,E
OR D
JR NZ,MTRDEL2
POP DE
RET
DSKWRITE: LD A,MAXWRRETRY
LD (RETRIES),A
LD A,(SECTORCNT)
LD B,A
LD A,(HSTSEC)
DSKWRITE0A: DJNZ DSKWRITE0B
JR DSKWRITE1
DSKWRITE0B: OR A
RL A
JR DSKWRITE0A
DSKWRITE1: INC A
LD (SECTORNO), A ; Convert from Host 512 byte sector into local sector according to paraameter block.
LD HL,(HSTTRK)
LD (TRACKNO),HL
DSKWRITE2: CALL SETTRKSEC ; Set current track & sector, get load address to HL
DSKWRITE3: CALL SETHEAD ; Set side reg
CALL SEEK ; Command 1b output (seek)
JP NZ,SEEKRETRY ;
CALL OUTTKSEC ; Set track & sector reg
LD IX, 0F3FEH ; As below. L03FE
LD IY,WRITEDATA ; Write sector from memory.
DI
;
LD A,0B4H ; Write Sector multipe with Side Compare for side 1.
CALL DISKCMDWAIT
LD D,2 ; Regardless of 4x128, 2x256 or 1x512, we always read 512bytes by the 2x INI instruction with B=256.
STRTDATWR: LD B,0 ; 256 bytes to load.
JP (IX)
WRITEDATA: OUTI
JP NZ, 0F3FEH ; This is crucial, as the Z80 is running at 2MHz it is not fast enough so needs
; hardware acceleration in the form of a banked ROM, if disk not ready jumps to IX, if
; data ready, jumps to IY.
DEC D
JP NZ,0F3FEH ; If we havent read all sectors to form a 512 byte block, go for next sector.
JR DATASTOP
; Read disk starting at the first logical sector in param block 1009/100A
; Continue reading for the given size 100B/100C and store in the location
; Pointed to by the address stored in the parameter block. 100D/100E
DSKREAD: LD A,MAXRDRETRY
LD (RETRIES),A
LD A,(SECTORCNT)
LD B,A
LD A,(HSTSEC)
DSKREAD0A: DJNZ DSKREAD0B
JR DSKREAD1
DSKREAD0B: OR A
RL A
JR DSKREAD0A
DSKREAD1: INC A
LD (SECTORNO), A ; Convert from Host 512 byte sector into local sector according to paraameter block.
LD HL,(HSTTRK)
LD (TRACKNO),HL
DSKREAD2: CALL SETTRKSEC ; Set current track & sector, get load address to HL
DSKREAD3: CALL SETHEAD ; Set side reg
CALL SEEK ; Command 1b output (seek)
JP NZ,SEEKRETRY ;
CALL OUTTKSEC ; Set track & sector reg
LD IX, 0F3FEH ; As below. L03FE
LD IY,READDATA ; Read sector into memory.
DI
;
LD A,094H ; Read Sector multiple with Side Compare for side 1.
CALL DISKCMDWAIT
LD D,2 ; Regardless of 4x128, 2x256 or 1x512, we always read 512bytes by the 2x INI instruction with B=256.
STRTDATRD: LD B,0 ; 256 bytes to load.
JP (IX)
; Get data from disk sector to staging area.
READDATA: INI
JP NZ,0F3FEH ; This is crucial, as the Z80 is running at 2MHz it is not fast enough so needs
; hardware acceleration in the form of a banked ROM, if disk not ready jumps to IX, if
; data ready, jumps to IY.
DEC D
JP NZ,0F3FEH ; If we havent read all sectors to form a 512 byte block, go for next sector.
;
;
DATASTOP: LD A,0D8H ; Force interrupt command, Immediate interrupt (I3 bit 3=1) of multiple sector read.
CPL
OUT (FDC_CR),A
CALL WAITRDY ; Wait for controller to become ready, acknowledging interrupt.
IN A,(FDC_STR) ; Check for errors.
CPL
AND 0FFH
JR NZ,SEEKRETRY
UPDSECTOR: PUSH HL
LD A,(SECTORCNT)
LD HL,SECTORNO
ADD A,(HL) ; Update sector to account for sectors read. NB. All reads will start at such a position
LD (HL), A ; that a read will not span a track or head. Ensure that disk formats meet an even 512byte format.
POP HL
MOTOROFF: LD A,MTROFFMSECS ; Schedule motor to be turned off.
LD (MTROFFTIMER),A
XOR A ; Successful read, return 0
EI
RET
SEEKRETRY: LD B,A ; Preserve the FDC Error byte.
LD A,(RETRIES)
DEC A
LD (RETRIES),A
LD A,B
JP Z,RETRIESERR
CALL DSKSEEKTK0
LD A, (READOP)
OR A
LD A,(TRACKNO) ; NB. Track number is 16bit, FDC only uses lower 8bit and assumes little endian read.
JP Z, DSKWRITE2 ; Try write again.
JP DSKREAD2 ; Try the read again.
DISKCMDWAIT:LD (FDCCMD),A
CPL
OUT (FDC_CR),A
CALL WAITBUSY
RET
; Send a command to the disk controller.
DSKCMD: LD (FDCCMD),A ; Store latest FDC command.
CPL ; Compliment it (FDC bit value is reversed).
OUT (FDC_CR),A ; Send command to FDC.
CALL WAITRDY ; Wait to become ready.
IN A,(FDC_STR) ; Get status register.
CPL ; Inverse (FDC is reverse bit logic).
RET
; Seek to programmed track.
SEEK: LD A,01BH ; Seek command, load head, verify stepping 6ms.
CALL DSKCMD
AND 099H
RET
; Set current track & sector, get load address to HL
SETTRKSEC: CALL SELDRIVE
LD A,(TRACKNO) ; NB. Track number is 16bit, FDC only uses lower 8bit and assumes little endian read.
LD HL, HSTBUF
RET
; Compute side/head.
SETHEAD: CPL ;
OUT (FDC_DR),A ; Output track no for SEEK command.
PUSH HL
LD HL,SECPERHEAD
LD A,(SECTORNO) ; Check sector, if greater than sector per track, change head.
CP (HL)
POP HL
JR NC,SETHD2 ; Yes, even, set side/head 1
LD A,001H ; No, odd, set side/head 0
JR SETHD3
; Set side/head register.
SETHD2: XOR A ; Side 0
SETHD3: CPL ; Side 1
OUT (FDC_SIDE),A ; Side/head register.
RET
; Set track and sector register.
OUTTKSEC: PUSH HL
LD HL,SECPERHEAD
;
LD C,FDC_DR ; Port for data retrieval in the INI instruction in main block.
LD A,(TRACKNO) ; Current track number, NB. Track number is 16bit, FDC only uses lower 8bit and assumes little endian read.
CPL
OUT (FDC_TR),A ; Track reg
;
LD A,(SECTORNO) ; Current sector number
CP (HL)
JR C,OUTTKSEC2
SUB (HL)
INC A ; Account for the +1 added to ease comparisons.
OUTTKSEC2: CPL
OUT (FDC_SCR),A ; Sector reg
POP HL
RET
; Seek to track 0.
DSKSEEKTK0: CALL DSKMTRON ; Make sure disk is spinning.
LD A,00BH ; Restore command, seek track 0.
CALL DSKCMD ; Send command to FDC.
AND 085H ; Process result.
XOR 004H
RET Z
JP DSKSEEKERR
; Wait for the drive to become ready.
WAITRDY: PUSH DE
PUSH HL
CALL FDCDLY1
LD E,007H
WAITRDY2: LD HL,00000H
WAITRDY3: DEC HL
LD A,H
OR L
JR Z,WAITRDY4
IN A,(FDC_STR)
CPL
RRCA
JR C,WAITRDY3
POP HL
POP DE
RET
WAITRDY4: DEC E
JR NZ,WAITRDY2
POP HL
POP DE
JP WAITRDYERR
WAITBUSY: PUSH DE
PUSH HL
CALL FDCDLY1
LD E,007H ; 7 Chances of a 16bit down count delay waiting for DRQ.
WAITBUSY2: LD HL,00000H
WAITBUSY3: DEC HL
LD A,H
OR L
JR Z,WAITBUSY4 ; Down counter expired, decrement retries, error on 0.
IN A,(FDC_STR) ; Get the FDC Status
CPL ; Switch to positive logic.
RRCA ; Shift Busy flag into Carry.
JR NC,WAITBUSY3 ; Busy not set, decrement counter and retry.
POP HL
POP DE
RET
WAITBUSY4: DEC E
JR NZ,WAITBUSY2
POP HL
POP DE
JP DSKERR
; Error processing. Consists of printing a message followed by debug data (if enabled) and returning with carry set
; to indicate error.
DSKERR: LD DE,LOADERR ; Loading error message
JR HDLERROR
SELDRVERR: LD DE,SELDRVMSG ; Select drive error message.
JR HDLERROR
WAITRDYERR: LD DE,WAITRDYMSG ; Waiting for ready timeout error message.
JR HDLERROR
DSKSEEKERR: LD DE,DSKSEEKMSG ; Disk seek to track error message.
JR HDLERROR
RETRIESERR: BIT 2,A ; Data overrun error if 1.
LD DE,DATAOVRMSG
JR NZ, RETRIESERR2
BIT 3,A ; CRC error if 1.
LD DE,CRCERRMSG
JR NZ,RETRIESERR2
LD DE,RETRIESMSG ; Data sector read error message.
RETRIESERR2:
; Process error, dump debug data and return fail code.
HDLERROR: SCF
CALL DEBUG
HOLPRTSTR: LD A,(DE)
OR A
JR Z,HDLPRTSTR3
INC DE
HOLPRTSTR2: CALL PRNT
JR HOLPRTSTR
HDLPRTSTR3: XOR A
CALL DSKINIT
CALL DSKMTRON
LD A,001H ; Indicate error by setting 1 in A register.
EI
RET
;-------------------------------------------------------------------------------
; END OF FDC CONTROLLER FUNCTIONALITY
;-------------------------------------------------------------------------------
;-------------------------------------------------------------------------------
; UTILITIES
;-------------------------------------------------------------------------------
; Function to print a string with control character interpretation.
MONPRTSTR: LD A,(DE)
OR A
RET Z
INC DE
MONPRTSTR2: CALL PRNT
JR MONPRTSTR
; Helper method to set up a Disk Parameter Block.
; Input: Drive Count = (CDIRBUF)
; CSV/ALV Memory Pointer (CDIRBUF+1)
; CSV Size (CDIRBUF+3)
; ALV Size (CDIRBUF+5)
; Disk parameters address CDIRBUF+7)
; Output: Updated CSV/ALV Pointer (CDIRBUF+1)
; Updated disk count (CDIRBUF)
COPYDPB: LD HL,DPBTMPL ; Base of parameter template.
LD BC,10
LDIR ; Copy the lower part of the DPB as it is static.
LD HL,CDIRBUF+7 ; Get the address of the disk parameters.
LDI
LDI
LD BC,(CDIRBUF+3) ; Add the CSV size for this entry to the pointer and store.
LD A,B ; Fixed drives dont have a CSV, so if 0, copy 0 and not allocate memory.
OR C
LD HL,CDIRBUF+1 ; Now get the free CSV/ALV pointer.
JR NZ,COPYDPB1
LD HL,CDIRBUF+3
COPYDPB1: LDI
LDI
LD HL,(CDIRBUF+1)
LD BC,(CDIRBUF+3) ; Add the CSV size for this entry to the pointer and store.
ADD HL,BC
LD (CDIRBUF+1),HL
LD HL,CDIRBUF+1
LDI
LDI
LD HL,(CDIRBUF+1)
LD BC,(CDIRBUF+5) ; Now add the size of the ALV for this drive to the pointer for the next drive.
ADD HL,BC
LD (CDIRBUF+1),HL ; Store.
LD A,(CDIRBUF)
INC A
LD (CDIRBUF),A ; Update drive count.
RET
; A function from the z88dk stdlib, a delay loop with T state accuracy.
;
; enter : hl = tstates >= 141
; uses : af, bc, hl
T_DELAY: LD BC,-141
ADD HL,BC
LD BC,-23
TDELAYLOOP: ADD HL,BC
JR C, TDELAYLOOP
LD A,L
ADD A,15
JR NC, TDELAYG0
CP 8
JR C, TDELAYG1
OR 0
TDELAYG0: INC HL
TDELAYG1: RRA
JR C, TDELAYB0
NOP
TDELAYB0: RRA
JR NC, TDELAYB1
OR 0
TDELAYB1: RRA
RET NC
RET
; Method to multiply a 16bit number by another 16 bit number to arrive at a 32bit result.
; Input: DE = Factor 1
; BC = Factor 2
; Output:DEHL = 32bit Product
;
MULT16X16: LD HL,0
LD A,16
MULT16X1: ADD HL,HL
RL E
RL D
JR NC,$+6
ADD HL,BC
JR NC,$+3
INC DE
DEC A
JR NZ,MULT16X1
RET
; Method to add a 16bit number to a 32bit number to obtain a 32bit product.
; Input: DEHL = 32bit Addend
; BC = 16bit Addend
; Output:DEHL = 32bit sum.
;
ADD3216: ADD HL,BC
EX DE,HL
LD BC,0
ADC HL,BC
EX DE,HL
RET
;-------------------------------------------------------------------------------
; END OF UTILITIES
;-------------------------------------------------------------------------------
; CPM Boot code.
;
; When CPM is loaded by TZFS it will execute startup code at this vector in 64K block 0. Once the memory mode
; switch executed then this block is paged in, so the follow on instructions must be in place otherwise the CPU
; will go into the wilderness!
;
IF $ > 01108H
ERROR "CMT comment area not aligned, needed for CPM bootstrap. Addr=%s, required=%s"; % $, 01108H
ENDIF
ALIGN_NOPS 01108H
BOOTSTG1: LD A,TZMM_CPM2
OUT (MMCFG), A
JP QBOOT_
; Method to reboot the machine back into TZFS. This code exists both in memory mode 2 and 7 at the same location so when a switch is made from
; mode 7 to mode 2, the code continues.
REBOOT: LD A,TZMM_TZFS
OUT (MMCFG),A
; Switch machine back to default state.
IF BUILD_VIDEOMODULE = 1
IN A,(VMCTRL) ; Get current display mode.
AND ~MODE_80CHAR ; Disable 80 char display.
OUT (VMCTRL),A ; Activate.
; LD A, SYSMODE_MZ80A ; Set bus and default CPU speed to 2MHz
; OUT (SYSCTRL),A ; Activate.
ELSE
; Change to 40 character mode on the 40/80 Char Colour board v1.0.
LD (DSPCTL), A
LD HL,DSPCTL ; Setup address of display control register latch.
LD A, 0 ; 40 char mode.
LD E,(HL) ; Dummy operation to enable latch write via multivibrator.
LD (HL), A
ENDIF
;
JP MROMADDR ; Now restart in the SA1510 monitor.
ALIGN_NOPS 01200H
;-------------------------------------------------------------------------------
; START OF KEYBOARD FUNCTIONALITY (INTR HANDLER SEPERATE IN CBIOS)
;-------------------------------------------------------------------------------
MODE: LD HL,KEYPF
LD (HL),08AH
LD (HL),007H ; Set Motor to Off.
LD (HL),004H ; Disable interrupts by setting INTMSK to 0.
LD (HL),001H ; Set VGATE to 1.
RET
; Method to check if a key has been pressed and stored in buffer..
CHKKY: LD A, (KEYCOUNT)
OR A
JR Z,CHKKY2
LD A,0FFH
RET
CHKKY2: XOR A
RET
GETKY: PUSH HL
LD A,(KEYCOUNT)
OR A
JR Z,GETKY2
GETKY1: DI ; Disable interrupts, we dont want a race state occurring.
LD A,(KEYCOUNT)
DEC A ; Take 1 off the total count as we are reading a character out of the buffer.
LD (KEYCOUNT),A
LD HL,(KEYREAD) ; Get the position in the buffer where the next available character resides.
LD A,(HL) ; Read the character and save.
PUSH AF
INC L ; Update the read pointer and save.
LD A,L
AND KEYBUFSIZE-1
LD L,A
LD (KEYREAD),HL
POP AF
EI ; Interrupts back on so keys and RTC are actioned.
JR PRCKEY ; Process the key, action any non ASCII keys.
;
GETKY2: LD A,(KEYCOUNT) ; No key available so loop until one is.
OR A
JR Z,GETKY2
JR GETKY1
;
PRCKEY: CP CR ; CR
JR NZ,PRCKY3
JR PRCKYE
PRCKY3: CP HOMEKEY ; HOME
JR NZ,PRCKY4
JR GETKY2
PRCKY4: CP CLRKEY ; CLR
JR NZ,PRCKY5
JR GETKY2
PRCKY5: CP INSERT ; INSERT
JR NZ,PRCKY6
JR GETKY2
PRCKY6: CP DBLZERO ; 00
JR NZ,PRCKY7
LD A,'0'
LD (KEYBUF),A ; Place a character into the keybuffer so we double up on 0
JR PRCKYX
PRCKY7: CP BREAKKEY ; Break key processing.
JR NZ,PRCKY8
JR PRCKYE
PRCKY8: CP DELETE
JR NZ,PRCKYX
LD A,BACKS ; Map DELETE to BACKSPACE, BACKSPACE is Rubout, DELETE is echo in CPM.
PRCKYX:
PRCKYE:
POP HL
RET
;-------------------------------------------------------------------------------
; END OF KEYBOARD FUNCTIONALITY
;-------------------------------------------------------------------------------
;-------------------------------------------------------------------------------
; START OF SCREEN FUNCTIONALITY
;-------------------------------------------------------------------------------
; CR PAGE MODE1
.CR: CALL .MANG
RRCA
JP NC,CURS2
LD L,000H
INC H
CP ROW - 1 ; End of line?
JR Z,.CP1
INC H
JP CURS1
.CP1: LD (DSPXY),HL
; SCROLLER
.SCROL: LD BC,SCRNSZ - COLW ; Scroll COLW -1 lines
LD DE,SCRN ; Start of the screen.
LD HL,SCRN + COLW ; Start of screen + 1 line.
PUSH BC ; 1000 STORE
LDIR
POP BC
PUSH DE
LD DE,SCRN + 800H ; COLOR RAM SCROLL
LD HL,SCRN + 800H + COLW ; SCROLL TOP + 1 LINE
LDIR
LD B,COLW ; ONE LINE
EX DE,HL
IF BUILD_80C = 0
LD A,071H ; Black background, white characters. Bit 7 is clear as a write to bit 7 @ DFFFH selects 40Char mode.
ELSE
LD A,071H ; Blue background, white characters in colour mode. Bit 7 is set as a write to bit 7 @ DFFFH selects 80Char mode.
ENDIF
;LD A,71H ; COLOR RAM INITIAL DATA
CALL DINT
POP HL
LD B,COLW
CALL CLER ; LAST LINE CLEAR
LD BC,ROW + 1 ; ROW NUMBER+1
LD DE,MANG ; LOGICAL MANAGEMENT
LD HL,MANG+1
LDIR
LD (HL),0
LD A,(MANG)
OR A
JP Z,RSTR
LD HL,DSPXY+1
DEC (HL)
JR .SCROL
DPCT: PUSH AF ; Display control, character is mapped to a function call.
PUSH BC
PUSH DE
PUSH HL
LD B,A
AND 0F0H
CP 0C0H
JP NZ,RSTR
XOR B
RLCA
LD C,A
LD B,000H
LD HL,.CTBL
DPCT1: ADD HL,BC
LD E,(HL)
INC HL
LD D,(HL)
EX DE,HL
JP (HL)
PRT: LD A,C
CALL ADCN
LD C,A
AND 0F0H
CP 0F0H
RET Z
CP 0C0H
LD A,C
JR NZ,PRNT3
PRNT5: CALL DPCT
CP 0C3H
JR Z,PRNT4
CP 0C5H
JR Z,PRNT2
CP 0CDH ; CR
JR Z,PRNT2
CP 0C6H
RET NZ
PRNT2: XOR A
PRNT2A: LD (DPRNT),A
RET
PRNT3: CALL DSP
PRNT4: LD A,(DPRNT)
INC A
CP COLW*2 ; 050H
JR C,PRNT4A
SUB COLW*2 ; 050H
PRNT4A: JR PRNT2A
NL: LD A,(DPRNT)
OR A
RET Z
LTNL: LD A,0CDH
JR PRNT5
PRTT: CALL PRTS
LD A,(DPRNT)
OR A
RET Z
L098C: SUB 00AH
JR C,PRTT
JR NZ,L098C
RET
; Function to disable the cursor display.
;
CURSOROFF: DI
CALL CURSRSTR ; Restore character under the cursor.
LD HL,FLASHCTL ; Indicate cursor is now off.
RES 7,(HL)
EI
RET
;
; Function to enable the cursor display.
;
CURSORON: DI
CALL DSPXYTOADDR ; Update the screen address for where the cursor should appear.
LD HL,FLASHCTL ; Indicate cursor is now on.
SET 7,(HL)
EI
RET
;
; Function to restore the character beneath the cursor iff the cursor is being dislayed.
;
CURSRSTR: PUSH HL
PUSH AF
LD HL,FLASHCTL ; Check to see if there is a cursor at the current screen location.
BIT 6,(HL)
JR Z,CURSRSTR1
RES 6,(HL)
LD HL,(DSPXYADDR) ; There is so we must restore the original character before further processing.
LD A,(FLASH)
LD (HL),A
CURSRSTR1: POP AF
POP HL
RET
;
; Function to convert XY co-ordinates to a physical screen location and save.
;
DSPXYTOADDR:PUSH HL
PUSH DE
PUSH BC
LD BC,(DSPXY) ; Calculate the new cursor position based on the XY coordinates.
LD DE,COLW
LD HL,SCRN - COLW
DSPXYTOA1: ADD HL,DE
DEC B
JP P,DSPXYTOA1
LD B,000H
ADD HL,BC
RES 3,H
LD (DSPXYADDR),HL ; Store the new address.
LD A,(HL) ; Store the new character.
LD (FLASH),A
DSPXYTOA2: POP BC
POP DE
POP HL
RET
;
; Function to print a space.
;
PRTS: LD A,020H
; Function to print a character to the screen. If the character is a control code it is processed as necessary
; otherwise the character is converted from ASCII display and displayed.
;
PRNT: DI
CALL CURSRSTR ; Restore char under cursor.
CP 00DH
JR Z,NEWLINE
CP 00AH
JR Z,NEWLINE
CP 07FH
JR Z,DELCHR
CP BACKS
JR Z,DELCHR
PUSH BC
LD C,A
LD B,A
CALL PRT
LD A,B
POP BC
PRNT1: CALL DSPXYTOADDR
EI
RET
; Delete a character on screen.
DELCHR: LD A,0C7H
CALL DPCT
JR PRNT1
NEWLINE: CALL NL
JR PRNT1
;
;
; Function to print out the contents of HL as 4 digit Hexadecimal.
;
PRTHL: LD A,H
CALL PRTHX
LD A,L
JR PRTHX
RET
;
; Function to print out the contents of A as 2 digit Hexadecimal
;
PRTHX: PUSH AF
RRCA
RRCA
RRCA
RRCA
CALL ASC
CALL PRNT
POP AF
CALL ASC
JP PRNT
ASC: AND 00FH
CP 00AH
JR C,NOADD
ADD A,007H
NOADD: ADD A,030H
RET
;CLR8Z: XOR A
; LD BC,00800H
; PUSH DE
; LD D,A
;L09E8: LD (HL),D
; INC HL
; DEC BC
; LD A,B
; OR C
; JR NZ,L09E8
; POP DE
; RET
REV: LD HL,REVFLG
LD A,(HL)
OR A
CPL
LD (HL),A
JR Z,REV1
LD A,(INVDSP)
JR REV2
REV1: LD A,(NRMDSP)
REV2: JP RSTR
.MANG: LD HL,MANG
.MANG2: LD A,(DSPXY + 1)
ADD A,L
LD L,A
LD A,(HL)
INC HL
RL (HL)
OR (HL)
RR (HL)
RRCA
EX DE,HL
LD HL,(DSPXY)
RET
L09C7: PUSH DE
PUSH HL
LD HL,PBIAS
XOR A
RLD
LD D,A
LD E,(HL)
RRD
XOR A
RR D
RR E
LD HL,SCRN
ADD HL,DE
LD (PAGETP),HL
POP HL
POP DE
RET
DSP: PUSH AF
PUSH BC
PUSH DE
PUSH HL
LD B,A
CALL PONT
LD (HL),B
LD HL,(DSPXY)
LD A,L
DSP01: CP COLW - 1 ; End of line.
JP NZ,CURSR
CALL .MANG
JR C,CURSR
.DSP03: EX DE,HL
LD (HL),001H
INC HL
LD (HL),000H
JP CURSR
CURSD: LD HL,(DSPXY)
LD A,H
CP ROW - 1
JR Z,CURS4
INC H
CURS1: ;CALL MGP.I
CURS3: LD (DSPXY),HL
JR RSTR
CURSU: LD HL,(DSPXY)
LD A,H
OR A
JR Z,CURS5
DEC H
CURSU1: JR CURS3
CURSR: LD HL,(DSPXY)
LD A,L
CP COLW - 1 ; End of line
JR NC,CURS2
INC L
JR CURS3
CURS2: LD L,000H
INC H
LD A,H
CP ROW
JR C,CURS1
LD H,ROW - 1
LD (DSPXY),HL
CURS4: JP .SCROL
CURSL: LD HL,(DSPXY)
LD A,L
OR A
JR Z,CURS5A
DEC L
JR CURS3
CURS5A: LD L,COLW - 1 ; End of line
DEC H
JP P,CURSU1
LD H,000H
LD (DSPXY),HL
CURS5: JR RSTR
CLRS: LD HL,MANG
LD B,01BH
CALL CLER
LD HL,SCRN
PUSH HL
CALL CLR8Z
IF BUILD_80C = 0
LD A,071H ; Black background, white characters. Bit 7 is clear as a write to bit 7 @ DFFFH selects 40Char mode.
ELSE
LD A,071H ; Blue background, white characters in colour mode. Bit 7 is set as a write to bit 7 @ DFFFH selects 80Char mode.
ENDIF
;LD A,71H ; COLOR DATA
CALL CLR8 ; D800H-DFFFH CLEAR
POP HL
CLRS1: LD A,(SCLDSP)
HOM0: LD HL,00000H
JP CURS3
RSTR: POP HL
RSTR1: POP DE
POP BC
POP AF
RET
DEL: LD HL,(DSPXY)
LD A,H
OR L
JR Z,RSTR
LD A,L
OR A
JR NZ,DEL1
CALL .MANG
JR C,DEL1
CALL PONT
DEC HL
LD (HL),000H
JR CURSL
DEL1: CALL .MANG
RRCA
LD A,COLW
JR NC,L0F13
RLCA
L0F13: SUB L
LD B,A
CALL PONT
PUSH HL
POP DE
DEC DE
SET 4,D
DEL2: RES 3,H
RES 3,D
LD A,(HL)
LD (DE),A
INC HL
INC DE
DJNZ DEL2
DEC HL
LD (HL),000H
JP CURSL
INST: CALL .MANG
RRCA
LD L,COLW - 1 ; End of line
LD A,L
JR NC,INST1A
INC H
INST1A: CALL PNT1
PUSH HL
LD HL,(DSPXY)
JR NC,INST2
LD A,(COLW*2)-1 ; 04FH
INST2: SUB L
LD B,A
POP DE
LD A,(DE)
OR A
JR NZ,RSTR
CALL PONT
LD A,(HL)
LD (HL),000H
INST1: INC HL
RES 3,H
LD E,(HL)
LD (HL),A
LD A,E
DJNZ INST1
JR RSTR
PONT: LD HL,(DSPXY)
PNT1: PUSH AF
PUSH BC
PUSH DE
PUSH HL
POP BC
LD DE,COLW
LD HL,SCRN - COLW
PNT2: ADD HL,DE
DEC B
JP P,PNT2
LD B,000H
ADD HL,BC
RES 3,H
POP DE
POP BC
POP AF
RET
CLER: XOR A
JR DINT
CLRFF: LD A,0FFH
DINT: LD (HL),A
INC HL
DJNZ DINT
RET
ADCN: PUSH BC
PUSH HL
LD HL,ATBL ;00AB5H
LD C,A
LD B,000H
ADD HL,BC
LD A,(HL)
JR DACN3
DACN: PUSH BC
PUSH HL
PUSH DE
LD HL,ATBL
LD D,H
LD E,L
LD BC,00100H
CPIR
JR Z,DACN1
LD A,0F0H
DACN2: POP DE
DACN3: POP HL
POP BC
RET
DACN1: OR A
DEC HL
SBC HL,DE
LD A,L
JR DACN2
; CTBL PAGE MODE1
.CTBL: DW .SCROL
DW CURSD
DW CURSU
DW CURSR
DW CURSL
DW HOM0
DW CLRS
DW DEL
DW INST
DW RSTR
DW RSTR
DW RSTR
DW REV
DW .CR
DW RSTR
DW RSTR
; ASCII TO DISPLAY CODE TABLE
ATBL: DB 0CCH ; NUL '\0' (null character)
DB 0E0H ; SOH (start of heading)
DB 0F2H ; STX (start of text)
DB 0F3H ; ETX (end of text)
DB 0CEH ; EOT (end of transmission)
DB 0CFH ; ENQ (enquiry)
DB 0F6H ; ACK (acknowledge)
DB 0F7H ; BEL '\a' (bell)
DB 0F8H ; BS '\b' (backspace)
DB 0F9H ; HT '\t' (horizontal tab)
DB 0FAH ; LF '\n' (new line)
DB 0FBH ; VT '\v' (vertical tab)
DB 0FCH ; FF '\f' (form feed)
DB 0FDH ; CR '\r' (carriage ret)
DB 0FEH ; SO (shift out)
DB 0FFH ; SI (shift in)
DB 0E1H ; DLE (data link escape)
DB 0C1H ; DC1 (device control 1)
DB 0C2H ; DC2 (device control 2)
DB 0C3H ; DC3 (device control 3)
DB 0C4H ; DC4 (device control 4)
DB 0C5H ; NAK (negative ack.)
DB 0C6H ; SYN (synchronous idle)
DB 0E2H ; ETB (end of trans. blk)
DB 0E3H ; CAN (cancel)
DB 0E4H ; EM (end of medium)
DB 0E5H ; SUB (substitute)
DB 0E6H ; ESC (escape)
DB 0EBH ; FS (file separator)
DB 0EEH ; GS (group separator)
DB 0EFH ; RS (record separator)
DB 0F4H ; US (unit separator)
DB 000H ; SPACE
DB 061H ; !
DB 062H ; "
DB 063H ; #
DB 064H ; $
DB 065H ; %
DB 066H ; &
DB 067H ; '
DB 068H ; (
DB 069H ; )
DB 06BH ; *
DB 06AH ; +
DB 02FH ; ,
DB 02AH ; -
DB 02EH ; .
DB 02DH ; /
DB 020H ; 0
DB 021H ; 1
DB 022H ; 2
DB 023H ; 3
DB 024H ; 4
DB 025H ; 5
DB 026H ; 6
DB 027H ; 7
DB 028H ; 8
DB 029H ; 9
DB 04FH ; :
DB 02CH ; ;
DB 051H ; <
DB 02BH ; =
DB 057H ; >
DB 049H ; ?
DB 055H ; @
DB 001H ; A
DB 002H ; B
DB 003H ; C
DB 004H ; D
DB 005H ; E
DB 006H ; F
DB 007H ; G
DB 008H ; H
DB 009H ; I
DB 00AH ; J
DB 00BH ; K
DB 00CH ; L
DB 00DH ; M
DB 00EH ; N
DB 00FH ; O
DB 010H ; P
DB 011H ; Q
DB 012H ; R
DB 013H ; S
DB 014H ; T
DB 015H ; U
DB 016H ; V
DB 017H ; W
DB 018H ; X
DB 019H ; Y
DB 01AH ; Z
DB 052H ; [
DB 059H ; \ '\\'
DB 054H ; ]
DB 0BEH ; ^
DB 03CH ; _
DB 0C7H ; `
DB 081H ; a
DB 082H ; b
DB 083H ; c
DB 084H ; d
DB 085H ; e
DB 086H ; f
DB 087H ; g
DB 088H ; h
DB 089H ; i
DB 08AH ; j
DB 08BH ; k
DB 08CH ; l
DB 08DH ; m
DB 08EH ; n
DB 08FH ; o
DB 090H ; p
DB 091H ; q
DB 092H ; r
DB 093H ; s
DB 094H ; t
DB 095H ; u
DB 096H ; v
DB 097H ; w
DB 098H ; x
DB 099H ; y
DB 09AH ; z
DB 0BCH ; {
DB 080H ; |
DB 040H ; }
DB 0A5H ; ~
DB 0C0H ; DEL
DB 040H
DB 0BDH
DB 09DH
DB 0B1H
DB 0B5H
DB 0B9H
DB 0B4H
DB 09EH
DB 0B2H
DB 0B6H
DB 0BAH
DB 0BEH
DB 09FH
DB 0B3H
DB 0B7H
DB 0BBH
DB 0BFH
DB 0A3H
DB 085H
DB 0A4H
DB 0A5H
DB 0A6H
DB 094H
DB 087H
DB 088H
DB 09CH
DB 082H
DB 098H
DB 084H
DB 092H
DB 090H
DB 083H
DB 091H
DB 081H
DB 09AH
DB 097H
DB 093H
DB 095H
DB 089H
DB 0A1H
DB 0AFH
DB 08BH
DB 086H
DB 096H
DB 0A2H
DB 0ABH
DB 0AAH
DB 08AH
DB 08EH
DB 0B0H
DB 0ADH
DB 08DH
DB 0A7H
DB 0A8H
DB 0A9H
DB 08FH
DB 08CH
DB 0AEH
DB 0ACH
DB 09BH
DB 0A0H
DB 099H
DB 0BCH
DB 0B8H
DB 080H
DB 03BH
DB 03AH
DB 070H
DB 03CH
DB 071H
DB 05AH
DB 03DH
DB 043H
DB 056H
DB 03FH
DB 01EH
DB 04AH
DB 01CH
DB 05DH
DB 03EH
DB 05CH
DB 01FH
DB 05FH
DB 05EH
DB 037H
DB 07BH
DB 07FH
DB 036H
DB 07AH
DB 07EH
DB 033H
DB 04BH
DB 04CH
DB 01DH
DB 06CH
DB 05BH
DB 078H
DB 041H
DB 035H
DB 034H
DB 074H
DB 030H
DB 038H
DB 075H
DB 039H
DB 04DH
DB 06FH
DB 06EH
DB 032H
DB 077H
DB 076H
DB 072H
DB 073H
DB 047H
DB 07CH
DB 053H
DB 031H
DB 04EH
DB 06DH
DB 048H
DB 046H
DB 07DH
DB 044H
DB 01BH
DB 058H
DB 079H
DB 042H
DB 060H
DB 0FDH
DB 0CBH
DB 000H
DB 01EH
;-------------------------------------------------------------------------------
; END OF SCREEN FUNCTIONALITY
;-------------------------------------------------------------------------------
;----------------------------------------
;
; ANSI EMULATION
;
; Emulate the Ansi standard
; N.B. Turned on when Chr
; 27 recieved.
; Entry - A = Char
; Exit - None
; Used - None
;
;----------------------------------------
ANSITERM: PUSH HL
PUSH DE
PUSH BC
PUSH AF
LD C,A ; Move character into C for safe keeping
;
LD A,(ANSIMODE)
OR A
JR NZ,ANSI2
LD A,C
CP 27
JP NZ,NOTANSI ; If it is Chr 27 then we haven't just
; been turned on, so don't bother with
; all the checking.
LD A,1 ; Turn on.
LD (ANSIMODE),A
JP AnsiMore
ANSI2: LD A,(CHARACTERNO) ; CHARACTER number in sequence
OR A ; Is this the first character?
JP Z,AnsiFirst ; Yes, deal with this strange occurance!
LD A,C ; Put character back in C to check
CP ";" ; Is it a semi colon?
JP Z,AnsiSemi
CP "0" ; Is it a number?
JR C,ANSI_NN ; If <0 then no
CP "9"+1 ; If >9 then no
JP C,AnsiNumber
ANSI_NN: CP "?" ; Simple trap for simple problem!
JP Z,AnsiMore
CP "@" ; Is it a letter?
JP C,ANSIEXIT ; Abandon if not letter; something wrong
ANSIFOUND: CALL CURSRSTR ; Restore any character under the cursor.
LD HL,(NUMBERPOS) ; Get value of number buffer
LD A,(HAVELOADED) ; Did we put anything in this byte?
OR A
JR NZ,AF1
LD (HL),255 ; Mark the fact that nothing was put in
AF1: INC HL
LD A,254
LD (HL),A ; Mark end of sequence (for unlimited length sequences)
;Disable cursor as unwanted side effects such as screen flicker may occur.
LD A,(FLASHCTL)
BIT 7,A
CALL NZ,CURSOROFF
XOR A
LD (CURSORCOUNT),A ; Restart count
LD A,0C9h
LD (CHGCURSMODE),A ; Disable flashing temp.
LD HL,NUMBERBUF ; For the routine called.
LD A,C ; Restore number
;
; Now work out what happens...
;
CP "A" ; Check for supported Ansi characters
JP Z,CUU ; Upwards
CP "B"
JP Z,CUD ; Downwards
CP "C"
JP Z,CUF ; Forward
CP "D"
JP Z,CUB ; Backward
CP "H"
JP Z,CUP ; Locate
CP "f"
JP Z,HVP ; Locate
CP "J"
JP Z,ED ; Clear screen
CP "m"
JP Z,SGR ; Set graphics renditon
CP "K"
JP Z,EL ; Clear to end of line
CP "s"
JP Z,SCP ; Save the cursor position
CP "u"
JP Z,RCP ; Restore the cursor position
ANSIEXIT: CALL CURSORON ; If t
LD HL,NUMBERBUF ; Numbers buffer position
LD (NUMBERPOS),HL
XOR A
LD (CHARACTERNO),A ; Next time it runs, it will be the
; first character
LD (HAVELOADED),A ; We haven't filled this byte!
LD (CHGCURSMODE),A ; Cursor allowed back again!
XOR A
LD (ANSIMODE),A
JR AnsiMore
NOTANSI: CP 000h ; Filter unprintable characters.
JR Z,AnsiMore
CALL PRNT
AnsiMore: POP AF
POP BC
POP DE
POP HL
RET
;
; The various routines needed to handle the filtered characters
;
AnsiFirst: LD A,255
LD (CHARACTERNO),A ; Next character is not first!
LD A,C ; Get character back
LD (ANSIFIRST),A ; Save first character to check later
CP "(" ; ( and [ have characters to follow
JP Z,AnsiMore ; and are legal.
CP "["
JP Z,AnsiMore
CP 09Bh ; CSI
JP Z,AnsiF1 ; Pretend that "[" was first ;-)
JP ANSIEXIT ; = and > don't have anything to follow
; them but are legal.
; Others are illegal, so abandon anyway.
AnsiF1: LD A,"[" ; Put a "[" for first character
LD (ANSIFIRST),A
JP ANSIEXIT
AnsiSemi: LD HL,(NUMBERPOS) ; Move the number pointer to the
LD A,(HAVELOADED) ; Did we put anything in this byte?
OR A
JR NZ,AS1
LD (HL),255 ; Mark the fact that nothing was put in
AS1: INC HL ; move to next byte
LD (NUMBERPOS),HL
XOR A
LD (HAVELOADED),A ; New byte => not filled!
JP AnsiMore
AnsiNumber: LD HL,(NUMBERPOS) ; Get address for number
LD A,(HAVELOADED)
OR A ; If value is zero
JR NZ,AN1
LD A,C ; Get value into A
SUB "0" ; Remove ASCII offset
LD (HL),A ; Save and Exit
LD A,255
LD (HAVELOADED),A ; Yes, we _have_ put something in!
JP AnsiMore
AN1: LD A,(HL) ; Stored value in A; TBA in C
ADD A,A ; 2 *
LD D,A ; Save the 2* for later
ADD A,A ; 4 *
ADD A,A ; 8 *
ADD A,D ; 10 *
ADD A,C ; 10 * + new num
SUB "0" ; And remove offset from C value!
LD (HL),A ; Save and Exit.
JP AnsiMore ; Note routine will only work up to 100
; which should be okay for this application.
;--------------------------------
; GET NUMBER
;
; Gets the next number from
; the list
;
; Entry - HL = address to get
; from
; Exit - HL = next address
; A = value
; IF a=255 then default value
; If a=254 then end of sequence
; Used - None
;--------------------------------
GetNumber: LD A,(HL) ; Get number
CP 254
RET Z ; Return if end of sequence,ie still point to
; end
INC HL ; Return pointing to next byte
RET ; Else next address and return
;*** ANSI UP
;
CUU: CALL GetNumber ; Number into A
LD B,A ; Save value into B
CP 255
JR NZ,CUUlp
LD B,1 ; Default value
CUUlp: LD A,(DSPXY+1) ; A <- Row
CP B ; Is it too far?
JR C,CUU1
SUB B ; No, then go back that far.
JR CUU2
CUU1: LD A,0 ; Make the choice, top line.
CUU2: LD (DSPXY+1),A ; Row <- A
JP ANSIEXIT
;*** ANSI DOWN
;
CUD: LD A,(ANSIFIRST)
CP "["
JP NZ,ANSIEXIT ; Ignore ESC(B
CALL GetNumber
LD B,A ; Save value in b
CP 255
JR NZ,CUDlp
LD B,1 ; Default
CUDlp: LD A,(DSPXY+1) ; A <- Row
ADD A,B
CP ROW ; Too far?
JP C,CUD1
LD A,ROW-1 ; Too far then bottom of screen
CUD1: LD (DSPXY+1),A ; Row <- A
JP ANSIEXIT
;*** ANSI RIGHT
;
CUF: CALL GetNumber ; Number into A
LD B,A ; Value saved in B
CP 255
JR NZ,CUFget
LD B,1 ; Default
CUFget: LD A,(DSPXY) ; A <- Column
ADD A,B ; Add movement.
CP 80 ; Too far?
JR C,CUF2
LD A,79 ; Yes, right edge
CUF2: LD (DSPXY),A ; Column <- A
JP ANSIEXIT
;*** ANSI LEFT
;
CUB: CALL GetNumber ; Number into A
LD B,A ; Save value in B
CP 255
JR NZ,CUBget
LD B,1 ; Default
CUBget: LD A,(DSPXY) ; A <- Column
CP B ; Too far?
JR C,CUB1a
SUB B
JR CUB1b
CUB1a: LD A,0
CUB1b: LD (DSPXY),A ; Column <-A
JP ANSIEXIT
;*** ANSI LOCATE
;
HVP:
CUP: CALL GetNumber
CP 255
CALL Z,DefaultLine ; Default = 1
CP 254 ; Sequence End -> 1
CALL Z,DefaultLine
CP ROW+1 ; Out of range then don't move
JP NC,ANSIEXIT
OR A
CALL Z,DefaultLine ; 0 means default, some strange reason
LD D,A
CALL GetNumber
CP 255 ; Default = 1
CALL Z,DefaultColumn
CP 254 ; Sequence End -> 1
CALL Z,DefaultColumn
CP 81 ; Out of range, then don't move
JP NC,ANSIEXIT
OR A
CALL Z,DefaultColumn ; 0 means go with default
LD E,A
EX DE,HL
DEC H ; Translate from Ansi co-ordinates to hardware
DEC L ; co-ordinates
LD (DSPXY),HL ; Set the cursor position.
JP ANSIEXIT
DefaultColumn:
DefaultLine:LD A,1
RET
;*** ANSI CLEAR SCREEN
;
ED: CALL GetNumber
OR A
JP Z,ED1 ; Zero means first option
CP 254 ; Also default
JP Z,ED1
CP 255
JP Z,ED1
CP 1
JP Z,ED2
CP 2
JP NZ,ANSIEXIT
;*** Option 2
;
ED3: LD HL,0
LD (DSPXY),HL ; Home the cursor
LD A,(JSW_FF)
OR A
JP NZ,ED_Set_LF
CALL CALCSCADDR
CALL CLRSCRN
JP ANSIEXIT
ED_Set_LF: XOR A ; Note simply so that
LD (JSW_LF),A ; ESC[2J works the same as CTRL-L
JP ANSIEXIT
;*** Option 0
;
ED1: LD HL,(DSPXY) ; Get and save cursor position
LD A,H
OR L
JP Z,ED3 ; If we are at the top of the
; screen and clearing to the bottom
; then we are clearing all the screen!
PUSH HL
LD A,ROW-1
SUB H ; ROW - Row
LD HL,0 ; Zero start
OR A ; Do we have any lines to add?
JR Z,ED1_2 ; If no bypass that addition!
LD B,A ; Number of lines to count
LD DE,80
ED1_1: ADD HL,DE
DJNZ ED1_1
ED1_2: EX DE,HL ; Value into DE
POP HL
LD A,80
SUB L ; 80 - Columns
LD L,A ; Add to value before
LD H,0
ADD HL,DE
PUSH HL ; Value saved for later
LD HL,(DSPXY) ; _that_ value again!
POP BC ; Number to blank
CALL CALCSCADDR
CALL CLRSCRN ; Now do it!
JP ANSIEXIT ; Then exit properly
;*** Option 1 - clear from cursor to beginning of screen
;
ED2: LD HL,(DSPXY) ; Get and save cursor position
PUSH HL
LD A,H
LD HL,0 ; Zero start
OR A ; Do we have any lines to add?
JR Z,ED2_2 ; If no bypass that addition!
LD B,A ; Number of lines
LD DE,80
ED2_1: ADD HL,DE
DJNZ ED2_1
ED2_2: EX DE,HL ; Value into DE
POP HL
LD H,0
ADD HL,DE
PUSH HL ; Value saved for later
LD HL,0 ; Find the begining!
POP BC ; Number to blank
CALL CLRSCRN ; Now do it!
JP ANSIEXIT ; Then exit properly
; *** ANSI CLEAR LINE
;
EL: CALL GetNumber ; Get value
CP 0
JP Z,EL1 ; Zero & Default are the same
CP 255
JP Z,EL1
CP 254
JP Z,EL1
CP 1
JP Z,EL2
CP 2
JP NZ,ANSIEXIT ; Otherwise don't do a thing
;*** Option 2 - clear entire line.
;
LD HL,(DSPXY)
LD L,0
LD (DSPXY),HL
CALL CALCSCADDR
LD BC,80 ; 80 bytes to clear (whole line)
CALL CLRSCRN
JP ANSIEXIT
;*** Option 0 - Clear from Cursor to end of line.
;
EL1: LD HL,(DSPXY)
LD A,80 ; Calculate distance to end of line
SUB L
LD C,A
LD B,0
LD (DSPXY),HL
PUSH HL
POP DE
CALL CALCSCADDR
CALL CLRSCRN
JP ANSIEXIT
;*** Option 1 - clear from cursor to beginning of line.
;
EL2: LD HL,(DSPXY)
LD C,L ; BC = distance from start of line
LD B,0
LD L,0
LD (DSPXY),HL
CALL CALCSCADDR
CALL CLRSCRN
JP ANSIEXIT
; In HL = XY Pos
; Out = Screen address.
CALCSCADDR: PUSH AF
PUSH BC
PUSH DE
PUSH HL
LD A,H
LD B,H
LD C,L
LD HL,SCRN
OR A
JR Z,CALC3
LD DE,80
CALC2: ADD HL,DE
DJNZ CALC2
CALC3: POP DE
ADD HL,BC
POP DE
POP BC
POP AF
RET
; HL = address
; BC = length
CLRSCRN: PUSH HL ; 1 for later!
LD D,H
LD E,L
INC DE ; DE <- HL +1
PUSH BC ; Save the value a little longer!
XOR A
LD (HL), A ; Blank this area!
LDIR ; *** just like magic ***
; only I forgot it in 22a!
POP BC ; Restore values
POP HL
LD DE,2048 ; Move to attributes block
ADD HL,DE
LD D,H
LD E,L
INC DE ; DE = HL + 1
LD A,(FONTSET) ; Save in the current values.
LD (HL),A
LDIR
RET
;*** ANSI SET GRAPHICS RENDITION
;
SGR: CALL GetNumber
CP 254 ; 254 signifies end of sequence
JP Z,ANSIEXIT
OR A
CALL Z,AllOff
CP 255 ; Default means all off
CALL Z,AllOff
CP 1
CALL Z,BoldOn
CP 2
CALL Z,BoldOff
CP 4
CALL Z,UnderOn
CP 5
CALL Z,ItalicOn
CP 6
CALL Z,ItalicOn
CP 7
CALL Z,InverseOn
JP SGR ; Code is re-entrant
;--------------------------------
;
; RESET GRAPHICS
;
; Entry - None
; Exit - None
; Used - None
;--------------------------------
AllOff: PUSH AF ; Save registers
LD A,0C9h ; = off
LD (BOLDMODE),A ; Turn the flags off
LD (ITALICMODE),A
LD (UNDERSCMODE),A
LD (INVMODE),A
LD A,017h ; Black background, white chars.
LD (FONTSET),A ; Reset the bit map store
POP AF ; Restore register
RET
;--------------------------------
;
; TURN BOLD ON
;
; Entry - None
; Exit - None
; Used - None
;--------------------------------
BoldOn: PUSH AF ; Save register
XOR A ; 0 means on
LD (BOLDMODE),A
BOn1: LD A,(FONTSET)
SET 0,A ; turn ON indicator flag
LD (FONTSET),A
POP AF ; Restore register
RET
;--------------------------------
;
; TURN BOLD OFF
;
; Entry - None
; Exit - None
; Used - None
;--------------------------------
BoldOff: PUSH AF ; Save register
PUSH BC
LD A,0C9h ; &C9 means off
LD (BOLDMODE),A
BO1: LD A,(FONTSET)
RES 0,A ; turn OFF indicator flag
LD (FONTSET),A
POP BC
POP AF ; Restore register
RET
;--------------------------------
;
; TURN ITALICS ON
; (replaces flashing)
; Entry - None
; Exit - None
; Used - None
;--------------------------------
ItalicOn: PUSH AF ; Save AF
XOR A
LD (ITALICMODE),A ; 0 means on
LD A,(FONTSET)
SET 1,A ; turn ON indicator flag
LD (FONTSET),A
POP AF ; Restore register
RET
;--------------------------------
;
; TURN UNDERLINE ON
;
; Entry - None
; Exit - None
; Used - None
;--------------------------------
UnderOn: PUSH AF ; Save register
XOR A ; 0 means on
LD (UNDERSCMODE),A
LD A,(FONTSET)
SET 2,A ; turn ON indicator flag
LD (FONTSET),A
POP AF ; Restore register
RET
;--------------------------------
;
; TURN INVERSE ON
;
; Entry - None
; Exit - None
; Used - None
;--------------------------------
InverseOn: PUSH AF ; Save register
XOR A ; 0 means on
LD (INVMODE),A
LD A,(FONTSET)
SET 3,A ; turn ON indicator flag
LD (FONTSET),A
POP AF ; Restore AF
RET
;*** ANSI SAVE CURSOR POSITION
;
SCP: LD HL,(DSPXY) ; (backup) <- (current)
LD (CURSORPSAV),HL
JP ANSIEXIT
;*** ANSI RESTORE CURSOR POSITION
;
RCP: LD HL,(CURSORPSAV) ; (current) <- (backup)
LD (DSPXY),HL
JP ANSIEXIT
;-------------------------------------------------------------------------------
; END OF ANSI TERMINAL FUNCTIONALITY
;-------------------------------------------------------------------------------
;-------------------------------------------------------------------------------
; START OF STATIC LOOKUP TABLES AND CONSTANTS
;-------------------------------------------------------------------------------
; Disk Parameter Header template.
DPBTMPL: DW 0000H, 0000H, 0000H, 0000H, CDIRBUF
;--------------------------------------
; Test Message table
;--------------------------------------
CBIOSSIGNON:IF BUILD_80C = 1
DB "** CBIOS v1.12, (C) P.D. Smart, 2019-21. Drives:", NUL
ELSE
DB "CBIOS v1.12, (C) P.D. Smart, 2019-21.", CR
DB "Drives:", NUL
ENDIF
CBIOSIGNEND:IF BUILD_80C = 1
DB " **", CR, NUL
ELSE
DB CR, NUL
ENDIF
CPMSIGNON: IF BUILD_80C = 1
DB "CP/M v2.23 (64K) Copyright(c) 1979 by Digital Research", CR, LF, NUL
ELSE
DB "CP/M v2.23 (c) 1979 by Digital Research", CR, LF, NUL
ENDIF
SDAVAIL: DB "SD", NUL
FDCAVAIL: DB "FDC", NUL
NOBDOS: DB "I/O Processor failed to load BDOS, aborting!", CR, LF, NUL
SVCRESPERR: DB "I/O Response Error, time out!", CR, NUL
SVCIOERR: DB "I/O Error, time out!", CR, NUL
LOADERR: DB "DISK ERROR - LOADING", CR, NUL
SELDRVMSG: DB "DISK ERROR - SELECT", CR, NUL
WAITRDYMSG: DB "DISK ERROR - WAIT", CR, NUL
DSKSEEKMSG: DB "DISK ERROR - SEEK", CR, NUL
RETRIESMSG: DB "DISK ERROR - RETRIES", CR, NUL
DATAOVRMSG: DB "DISK ERROR - DATA OVERRUN", CR, NUL
CRCERRMSG: DB "DISK ERROR - CRC ERROR", CR, NUL
;-------------------------------------------------------------------------------
; END OF STATIC LOOKUP TABLES AND CONSTANTS
;-------------------------------------------------------------------------------
;-------------------------------------------------------------------------------
; START OF DEBUGGING FUNCTIONALITY
;-------------------------------------------------------------------------------
; Debug routine to print out all registers and dump a section of memory for analysis.
;
DEBUG: IF ENADEBUG = 1
LD (DBGSTACKP),SP
LD SP,DBGSTACK
;
PUSH AF
PUSH BC
PUSH DE
PUSH HL
;
PUSH AF
PUSH HL
PUSH DE
PUSH BC
PUSH AF
LD DE, INFOMSG
CALL MONPRTSTR
POP BC
LD A,B
CALL PRTHX
LD A,C
CALL PRTHX
LD DE, INFOMSG2
CALL MONPRTSTR
POP BC
LD A,B
CALL PRTHX
LD A,C
CALL PRTHX
LD DE, INFOMSG3
CALL MONPRTSTR
POP DE
LD A,D
CALL PRTHX
LD A,E
CALL PRTHX
LD DE, INFOMSG4
CALL MONPRTSTR
POP HL
LD A,H
CALL PRTHX
LD A,L
CALL PRTHX
LD DE, INFOMSG5
CALL MONPRTSTR
LD HL,(DBGSTACKP)
LD A,H
CALL PRTHX
LD A,L
CALL PRTHX
CALL NL
LD DE, DRVMSG
CALL MONPRTSTR
LD A, (CDISK)
CALL PRTHX
LD DE, FDCDRVMSG
CALL MONPRTSTR
LD A, (FDCDISK)
CALL PRTHX
LD DE, SEKTRKMSG
CALL MONPRTSTR
LD BC,(SEKTRK)
LD A,B
CALL PRTHX
LD A,C
CALL PRTHX
CALL PRTS
LD A,(SEKSEC)
CALL PRTHX
CALL PRTS
LD A,(SEKHST)
CALL PRTHX
LD DE, HSTTRKMSG
CALL MONPRTSTR
LD BC,(HSTTRK)
LD A,B
CALL PRTHX
LD A,C
CALL PRTHX
CALL PRTS
LD A,(HSTSEC)
CALL PRTHX
LD DE, UNATRKMSG
CALL MONPRTSTR
LD BC,(UNATRK)
LD A,B
CALL PRTHX
LD A,C
CALL PRTHX
CALL PRTS
LD A,(UNASEC)
CALL PRTHX
LD DE, CTLTRKMSG
CALL MONPRTSTR
LD A,(TRACKNO) ; NB. Track number is 16bit, FDC only uses lower 8bit and assumes little endian read.
CALL PRTHX
CALL PRTS
LD A,(SECTORNO)
CALL PRTHX
LD DE, DMAMSG
CALL MONPRTSTR
LD BC,(DMAADDR)
LD A,B
CALL PRTHX
LD A,C
CALL PRTHX
CALL NL
;
POP AF
JR C, SKIPDUMP
;
LD HL,DPBASE ; Dump the startup vectors.
LD DE, 1000H
ADD HL, DE
EX DE,HL
LD HL,DPBASE
CALL DUMPX
LD HL,00000h ; Dump the startup vectors.
LD DE, 00A0H
ADD HL, DE
EX DE,HL
LD HL,00000h
CALL DUMPX
LD HL,IBUFE ; Dump the data area.
LD DE, 0300H
ADD HL, DE
EX DE,HL
LD HL,IBUFE
CALL DUMPX
LD HL,CBASE ; Dump the CCP + BDOS area.
LD DE,CPMBIOS - CBASE
ADD HL, DE
EX DE,HL
LD HL,CBASE
CALL DUMPX
SKIPDUMP: ;JR SKIPDUMP
POP HL
POP DE
POP BC
POP AF
;
LD SP,(DBGSTACKP)
RET
; HL = Start
; DE = End
DUMPX: LD A,10
DUM1: LD (TMPCNT),A
DUM3: LD B,010h
LD C,02Fh
CALL NLPHL
DUM2: CALL SPHEX
INC HL
PUSH AF
LD A,(DSPXY)
ADD A,C
LD (DSPXY),A
POP AF
CP 020h
JR NC,L0D51
LD A,02Eh
L0D51: CALL PRNT
LD A,(DSPXY)
INC C
SUB C
LD (DSPXY),A
DEC C
DEC C
DEC C
PUSH HL
SBC HL,DE
POP HL
JR NC,DUM7
L0D78: DJNZ DUM2
LD A,(TMPCNT)
DEC A
LD (TMPCNT),A
JR NZ,DUM3
DUM4: CALL CHKKY
CP 0FFH
JR NZ,DUM4
CALL GETKY
CP 'D'
JR NZ,DUM5
LD A,8
JR DUM1
DUM5: CP 'U'
JR NZ,DUM6
PUSH DE
LD DE,00100H
OR A
SBC HL,DE
POP DE
LD A,8
JR DUM1
DUM6: CP 'X'
JR Z,DUM7
JR DUMPX
DUM7: CALL NL
RET
NLPHL: CALL NL
CALL PRTHL
RET
; SPACE PRINT AND DISP ACC
; INPUT:HL=DISP. ADR.
SPHEX: CALL PRTS ; SPACE PRINT
LD A,(HL)
CALL PRTHX ; DSP OF ACC (ASCII)
LD A,(HL)
RET
; Debugger messages, bit cryptic but this is due to limited space on the screen.
;
DRVMSG: DB "DRV=", 000H
FDCDRVMSG: DB ",FDC=", 000H
SEKTRKMSG: DB ",S=", 000H
HSTTRKMSG: DB ",H=", 000H
UNATRKMSG: DB ",U=", 000H
CTLTRKMSG: DB ",C=", 000H
DMAMSG: DB ",DMA=", 000H
INFOMSG: DB "AF=", NUL
INFOMSG2: DB ",BC=", 000H
INFOMSG3: DB ",DE=", 000H
INFOMSG4: DB ",HL=", 000H
INFOMSG5: DB ",SP=", 000H
; Seperate stack for the debugger so as not to affect anything it is reporting on.
;
DBGSTACKP: DS 2
DS 128, 0AAH
DBGSTACK: EQU $
ALIGN 00400H
ENDIF
;-------------------------------------------------------------------------------
; END OF DEBUGGING FUNCTIONALITY
;-------------------------------------------------------------------------------
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