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Compaq EGA: Implement C&T behavior where reads in mode 0 return 0xFF if bit 2 of GDC register 4 is set, fixes video memory size detection, fixes #4571.

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OBattler
2024-08-07 05:08:41 +02:00
parent 608165295b
commit fbfb6849c4
1 changed files with 4 additions and 0 deletions
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4
src/video/vid_ega.c
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@@ -1278,6 +1278,10 @@ ega_read(uint32_t addr, void *priv)
temp4 &= (ega->colournocare & 8) ? 0xff : 0; temp4 &= (ega->colournocare & 8) ? 0xff : 0;
return ~(temp | temp2 | temp3 | temp4); return ~(temp | temp2 | temp3 | temp4);
} }
if ((ega_type == 2) && (ega->gdcreg[4] & 0x04))
return 0xff;
return ega->vram[addr | readplane]; return ega->vram[addr | readplane];
} }