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Process command D1 (write output port) instantly, required for Windows 95 to work correctly on some chipsets such as SiS 50x.

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OBattler
2023-04-02 23:21:20 +02:00
parent 1c2100da5a
commit a41935301b
1 changed files with 20 additions and 0 deletions
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20
src/device/keyboard_at.c
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@@ -2338,10 +2338,30 @@ kbd_write(uint16_t port, uint8_t val, void *priv)
switch (port) {
case 0x60:
dev->status &= ~STAT_CD;
if (dev->want60 && (dev->command == 0xd1)) {
kbd_log("ATkbc: write output port\n");
/* Bit 2 of AMI flags is P22-P23 blocked (1 = yes, 0 = no),
discovered by reverse-engineering the AOpeN Vi15G BIOS. */
if (dev->ami_flags & 0x04) {
/* If keyboard controller lines P22-P23 are blocked,
we force them to remain unchanged. */
val &= ~0x0c;
val |= (dev->output_port & 0x0c);
}
write_output(dev, val | 0x01);
dev->want60 = 0;
return;
}
break;
case 0x64:
dev->status |= STAT_CD;
if (val == 0xd1) {
kbd_log("ATkbc: write output port\n");
dev->want60 = 1;
dev->command = 0xd1;
return;
}
break;
}