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FDC: Fix DOR FINTR disabling, fixes #5851.

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This commit is contained in:
OBattler
2025-07-31 18:26:27 +02:00
parent be80bd634b
commit 3ef7f82c78
1 changed files with 18 additions and 7 deletions
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25
src/floppy/fdc.c
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@@ -335,14 +335,17 @@ fdc_int(fdc_t *fdc, int set_fintr)
{
int ienable = 0;
if (!(fdc->flags & FDC_FLAG_PCJR))
if (fdc->flags & FDC_FLAG_PS2_MCA)
ienable = 1;
else if (!(fdc->flags & FDC_FLAG_PCJR))
ienable = !!(fdc->dor & 8);
if (ienable)
if (ienable) {
picint(1 << fdc->irq);
if (set_fintr)
fdc->fintr = 1;
if (set_fintr)
fdc->fintr = 1;
}
fdc_log("fdc_int(%i): fdc->fintr = %i\n", set_fintr, fdc->fintr);
}
@@ -762,9 +765,17 @@ fdc_write(uint16_t addr, uint8_t val, void *priv)
fdc->st0 &= ~0x07;
fdc->st0 |= (fdd_get_head(0) ? 4 : 0);
} else {
if (!(val & 8) && (fdc->dor & 8)) {
fdc->tc = 1;
fdc_int(fdc, 1);
/*
Writing this bit to logic "1" will enable the DRQ,
nDACK, TC and FINTR outputs. This bit being a
logic "0" will disable the nDACK and TC inputs, and
hold the DRQ and FINTR outputs in a high
impedance state.
*/
if (!(val & 8) && (fdc->dor & 8) && !(fdc->flags & FDC_FLAG_PS2_MCA)) {
fdc->tc = 1;
fdc->fintr = 0;
picintc(1 << fdc->irq);
}
if (!(val & 4)) {
fdd_stop(real_drive(fdc, val & 3));