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Always take the PCjr path for 0-step seeks, fixes 1B/V3 without breaking 386BSD.

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This commit is contained in:
OBattler
2025-11-29 06:40:53 +01:00
parent f11ca60ae9
commit e140db7d14
1 changed files with 5 additions and 16 deletions
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21
src/floppy/fdc.c
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@@ -1312,14 +1312,8 @@ fdc_write(uint16_t addr, uint8_t val, void *priv)
fdc->step = 1;
} else {
fdc->st0 = 0x20 | (fdc->params[0] & 3);
if (fdc->flags & FDC_FLAG_PCJR) {
fdc->fintr = 1;
fdc->interrupt = -4;
} else {
timer_disable(&fdc->timer);
fdc->interrupt = -3;
fdc_callback(fdc);
}
fdc->fintr = 1;
fdc->interrupt = -4;
break;
}
} else {
@@ -1327,14 +1321,9 @@ fdc_write(uint16_t addr, uint8_t val, void *priv)
if ((fdc->params[1] - fdc->pcn[fdc->params[0] & 3]) == 0) {
fdc_log("Failed seek\n");
fdc->st0 = 0x20 | (fdc->params[0] & 3);
if (fdc->flags & FDC_FLAG_PCJR) {
fdc->fintr = 1;
fdc->interrupt = -4;
} else {
timer_disable(&fdc->timer);
fdc->interrupt = -3;
fdc_callback(fdc);
}
/* Always use the PCjr code, so both 386BSD and 1B/V3 work. */
fdc->fintr = 1;
fdc->interrupt = -4;
break;
}
if (fdc->params[1] > fdc->pcn[fdc->params[0] & 3])