add instruction for creation of SD Card cpm

image to readme

README.md

@@ -43,13 +43,52 @@ UART connected to serial interface 2 of the core. The latter allows to use the c
 For more details on console connection, refer to the official MiSTer documentation:
 [MiSTer Console Connection Guide](https://mister-devel.github.io/MkDocs_MiSTer/advanced/console/)
 
-
-
 ## The MiSTer OSD allows the access to four machines:
 
 ### Z80 CP/M: 
 You can now use both an external SDCard and/or select the image file within MiSTer. Whatever you like.
 
+### Formatting the SD Card and Installing CP/M
+
+Note this procedure has to be performed from a tty terminal as descibed above.
+
+#### Formatting the Drive
+
+1. Load the Intel-HEX dump of the `FORMAT` program into memory by copying the contents of `FORM128.HEX` (for 128MB SD card utilization) into the terminal window.
+2. The `FORMAT` program will reside at memory address `$5000` when loaded. To start the formatting process, execute the program by typing `G5000` and pressing ENTER.
+3. You will see the following message:
+
+```
+CP/M Formatter by G. Searle 2012
+```
+
+4. After a few seconds, the formatting process will display:
+
+```
+ABCDEFGHIJKLMNOP
+Formatting complete
+```
+
+Each drive is 8MB, so a 128MB SD card will have drives labeled A: to P:.
+
+#### Installing CP/M
+
+CP/M is installed on the first track of the disk. When booted, the first track is read into memory and executed. To install CP/M, follow these steps:
+
+1. Load the Intel-HEX dump of CP/M by copying the contents of `CPM22.HEX` into the terminal window (this takes about 10 seconds).
+2. Load the Intel-HEX dump of the CBIOS by copying the contents of `CBIOS128.HEX` (for 128MB total drive space) into the terminal window (this takes about 3 seconds).
+3. Load the Intel-HEX dump of `PUTSYS` by copying the contents of `PUTSYS.HEX` into the terminal window.
+
+The `PUTSYS` program also resides at memory address `$5000`. To transfer CP/M and CBIOS to the disk, execute `PUTSYS` by typing `G5000` and pressing ENTER. You will see:
+
+```
+CP/M System Transfer by G. Searle 2012
+System transfer complete
+```
+
+At this point, CP/M is installed and ready for boot. You can now proceed with installing applications.
+
+
 For convenience you can use the Multicomp FPGA - CP/M Demo Disk from Obsolescence Guaranteed:
 http://obsolescence.wixsite.com/obsolescence/multicomp-fpga-cpm-demo-disk
 
@@ -65,13 +104,16 @@ RIGHT$, MID$, END, FOR, NEXT, DATA, INPUT, DIM, READ, LET, GOTO, RUN, IF, RESTOR
 NULL, WAIT,  DEF, POKE, DOKE, LINES, CLS, WIDTH, MONITOR, PRINT, CONT, LIST, CLEAR, NEW, TAB, TO, FN, SPC, THEN, NOT, 
 STEP, +, -, *, /, ^, AND, OR, >, <, = 
 
-PLUS my additional implementations here (making it version 4.7b):
+PLUS additional implementations here (making it version 4.7b):
 
 HEX$(nn) - convert a SIGNED integer (-32768 to +32767) to a string containing the hex value
-BIN$(nn) - convert a SIGNED integer (-32768 to +32767) to a string containing the binary value
-&Hnn - interpret the value after the &H as a HEX value (signed 16 bit)
-&Bnn - interpret the value after the &B as a BINARY value (signed 16 bit)
 
+BIN$(nn) - convert a SIGNED integer (-32768 to +32767) to a string containing the binary value
+
+&Hnn - interpret the value after the &H as a HEX value (signed 16 bit)
+
+&Bnn - interpret the value after the &B as a BINARY value (signed 16 bit)
+ 
 ### 6502 Basic - No SD card support (No CSAVE/CLOAD):
 END, FOR, NEXT, DATA, INPUT, DIM, READ, LET, GOTO, RUN, IF, RESTORE, GOSUB, RETURN, REM, STOP, ON, NULL, WAIT, DEF, POKE, PRINT,
 CONT, LIST, CLEAR, NEW, TAB(, TO, FN, SPC(, THEN, NOT, STEP, SGN, INT, ABS, USR, FRE, POS, SQR, RND, LOG, EXP, COS, SIN, TAN, ATN,