mister-devel/PCXT_MiSTer
1
0
Fork 0
mirror of https://github.com/MiSTer-devel/PCXT_MiSTer.git synced 2026-05-17 03:04:20 +00:00
Code Issues Packages Projects Releases Wiki Activity

Memory map selection according to video mode

Browse Source 
Thanks to this change, some parts of the area5150 demo that didn't look right, like the dancing elephant, are now displayed correctly.

Thanks @somhi for noticing this detail.
This commit is contained in:
Aitor Gómez
2022-08-13 07:51:11 +02:00
parent f89ae7dcdd
commit faeb8370c7
2 changed files with 16 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
rtl/KFPC-XT/HDL/Peripherals.sv
View File

@@ -97,6 +97,10 @@ module PERIPHERALS #(
// Mode Switch
input logic tandy_mode
);
wire grph_mode;
wire hres_mode;
//
// chip select
//
@@ -131,8 +135,8 @@ module PERIPHERALS #(
wire tandy_chip_select_n = ~(iorq && ~address_enable_n && address[15:3] == (16'h00c0 >> 3)); // 0xc0 - 0xc7
wire opl_chip_select_n = ~(iorq && ~address_enable_n && address[15:1] == (16'h0388 >> 1)); // 0x388 .. 0x389
wire cga_chip_select_n = ~(~iorq && ~address_enable_n && enable_cga & (address[19:15] == 6'b10111)); // B8000 - BFFFF (32 KB)
wire mda_chip_select_n = ~(~iorq && ~address_enable_n && enable_mda & (address[19:15] == 6'b10110)); // B0000 - B7FFF (32 KB)
wire cga_chip_select_n = ~(~iorq && ~address_enable_n && enable_cga & (address[19:15] == 5'b10111)); // B8000 - BFFFF (16 KB / 32 KB)
wire mda_chip_select_n = ~(~iorq && ~address_enable_n && enable_mda & (address[19:14] == 6'b101100)); // B0000 - B7FFF (16 KB)
wire bios_select_n = ~(~iorq && ~address_enable_n && address[19:16] == 4'b1111); // F0000 - FFFFF (64 KB)
wire xtide_select_n = ~(~iorq && ~address_enable_n && address[19:14] == 6'b111011); // EC000 - EFFFF (16 KB)
wire uart_cs = (~address_enable_n && {address[15:3], 3'd0} == 16'h03F8);
@@ -729,7 +733,9 @@ module PERIPHERALS #(
.splashscreen (splashscreen),
.thin_font (thin_font),
.tandy_video (tandy_video),
.color (color)
.color (color),
.grph_mode (grph_mode),
.hres_mode (hres_mode)
);
always_ff @(posedge clock) begin
@@ -752,13 +758,13 @@ module PERIPHERALS #(
.clka (clock),
.ena (~cga_chip_select_n),
.wea (~memory_write_n),
.addra (address[14:0]),
.addra ((tandy_mode & grph_mode & hres_mode) ? address[14:0] : address[13:0]),
.dina (internal_data_bus),
.douta (cga_vram_cpu_dout),
.clkb (clk_vga_cga),
.web (1'b0),
.enb (CGA_VRAM_ENABLE),
.addrb (CGA_VRAM_ADDR[14:0]),
.addrb ((tandy_mode & grph_mode & hres_mode) ? CGA_VRAM_ADDR[14:0] : CGA_VRAM_ADDR[13:0]),
.dinb (8'h0),
.doutb (CGA_VRAM_DOUT)
);
@@ -769,13 +775,13 @@ module PERIPHERALS #(
.clka (clock),
.ena (~mda_chip_select_n),
.wea (~memory_write_n),
.addra (address[14:0]),
.addra (address[13:0]),
.dina (internal_data_bus),
.douta (mda_vram_cpu_dout),
.clkb (clk_vga_mda),
.web (1'b0),
.enb (MDA_VRAM_ENABLE),
.addrb (MDA_VRAM_ADDR[14:0]),
.addrb (MDA_VRAM_ADDR[13:0]),
.dinb (8'h0),
.doutb (MDA_VRAM_DOUT)
);

6
rtl/video/cga.v
View File

@@ -42,7 +42,9 @@ module cga(
input splashscreen,
input thin_font,
input tandy_video,
input color
input color,
output grph_mode,
output hres_mode
);
parameter MDA_70HZ = 0;
@@ -73,8 +75,6 @@ module cga(
reg[3:0] tandy_newcolor = 4'b0000;
reg tandy_palette_set;
wire hres_mode;
wire grph_mode;
wire bw_mode;
wire mode_640;
wire tandy_16_mode;