github.com/mist-devel.mist-board
1
0
Fork 0
mirror of https://github.com/mist-devel/mist-board.git synced 2026-01-28 12:38:43 +00:00
Code Issues Releases Wiki Activity

[ATARI ST] Return on odd/non existent acia regs. Fixes A_496 intro

Browse Source
This commit is contained in:
harbaum
2015-04-28 14:16:06 +00:00
parent 2c4d25c532
commit b32ef045cf
1 changed files with 10 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
cores/mist/mist_top.v
View File

@@ -231,12 +231,17 @@ wire dma_sel = io_sel && (
(({tg68_adr[15:1], 1'd0} == 16'h860e) && ste)); // ff860e-ff860f (hdmode, STE)
wire [15:0] dma_data_out;
// de-multiplex the various io data output ports into one
wire [7:0] io_data_out_8u = acia_data_out;
wire [7:0] io_data_out_8l = mmu_data_out | mfp_data_out | auto_vector | mste_ctrl_data_out;
// --------- de-multiplex the various io data output ports into one -----------
// acia returns 0xff on odd addresses (needed e.g. by intro of automation 496)
wire [15:0] acia_data_out_16 = { acia_data_out, acia_sel?8'hff:8'h00 };
wire io_data_out_8l_sel = mmu_sel | mfp_sel | auto_iack | mste_ctrl_sel;
wire [15:0] mfp_data_out_16 = { mfp_sel?8'hff:8'h00, mfp_data_out };
wire [15:0] mmu_data_out_16 = { mmu_sel?8'hff:8'h00, mmu_data_out };
wire [15:0] mste_ctrl_data_out_16 = { mste_ctrl_sel?8'hff:8'h00, mste_ctrl_data_out };
// wire [7:0] io_data_out_8l = mste_ctrl_data_out;
wire [15:0] io_data_out = vreg_data_out | dma_data_out | blitter_data_out |
ste_joy_data_out | audio_data_out | rom_data_out |
{8'h00, io_data_out_8l} | {io_data_out_8u, 8'h00};
ste_joy_data_out | audio_data_out | rom_data_out | { 8'h00, auto_vector } |
mfp_data_out_16 | mmu_data_out_16 | mste_ctrl_data_out_16 | acia_data_out_16;
wire init = ~pll_locked;