Retro/pcem
Watch
1
0
Fork
You've already forked pcem
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Fix reads of 3C6 on SDAC (Bahamas 64) when not returning command register or RAMDAC ID.

Browse source
This commit is contained in:
SarahW 2019-05-12 18:00:19 +01:00
commit aa933688eb
1 changed files with 3 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

7
src/vid_sdac_ramdac.c
View file

@ -96,7 +96,6 @@ void sdac_ramdac_out(uint16_t addr, uint8_t val, sdac_ramdac_t *ramdac, svga_t *
uint8_t sdac_ramdac_in(uint16_t addr, sdac_ramdac_t *ramdac, svga_t *svga) uint8_t sdac_ramdac_in(uint16_t addr, sdac_ramdac_t *ramdac, svga_t *svga)
{ {
uint8_t temp;
// /*if (CS!=0xC000) */pclog("IN RAMDAC %04X %04X:%04X %i %i %i\n",addr,CS,cpu_state.pc, ramdac->rs2, ramdac->rindex, ramdac->windex); // /*if (CS!=0xC000) */pclog("IN RAMDAC %04X %04X:%04X %i %i %i\n",addr,CS,cpu_state.pc, ramdac->rs2, ramdac->rindex, ramdac->windex);
switch (addr) switch (addr)
{ {
@ -105,15 +104,15 @@ uint8_t sdac_ramdac_in(uint16_t addr, sdac_ramdac_t *ramdac, svga_t *svga)
ramdac->magic_count++; ramdac->magic_count++;
if (ramdac->magic_count == 4) if (ramdac->magic_count == 4)
{ {
temp = 0x70; /*SDAC ID*/
ramdac->rs2 = 1; ramdac->rs2 = 1;
return 0x70; /*SDAC ID*/
} }
if (ramdac->magic_count == 5) if (ramdac->magic_count == 5)
{ {
temp = ramdac->command;
ramdac->magic_count = 0; ramdac->magic_count = 0;
return ramdac->command;
} }
return temp; break;
case 3: case 3:
ramdac->magic_count=0; ramdac->magic_count=0;
break; break;