80486DX2-66/86Box-fork
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Filed / zero-step seek and recalibrates now instantly raise FINTR when not on PCjr, fixes 386BSD seek errors (though 386BSD still triple fault resets).

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This commit is contained in:
OBattler
2020-06-18 00:22:04 +02:00
parent 4fa8fd3dc0
commit f8126ceaba
1 changed files with 28 additions and 8 deletions
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36
src/floppy/fdc.c
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@@ -1120,8 +1120,10 @@ fdc_write(uint16_t addr, uint8_t val, void *priv)
if (fdc->flags & FDC_FLAG_PCJR) {
fdc->fintr = 1;
fdc->interrupt = -4;
} else
} else {
fdc->interrupt = -3;
fdc_callback(fdc);
}
break;
}
if ((real_drive(fdc, fdc->drive) != 1) || fdc->drv2en)
@@ -1170,7 +1172,7 @@ fdc_write(uint16_t addr, uint8_t val, void *priv)
/* Three conditions under which the command should fail. */
if (!fdd_get_flags(drive_num) || (drive_num >= FDD_NUM) || !motoron[drive_num]) {
/* Yes, failed SEEK's still report success, unlike failed RECALIBRATE's. */
fdc->st0 = 0x20 | (fdc->params[0] & 7);
fdc->st0 = 0x20 | (fdc->params[0] & 3);
if (fdc->command & 0x80) {
if (fdc->command & 0x40)
fdc->pcn[fdc->params[0] & 3] += fdc->params[1];
@@ -1178,7 +1180,13 @@ fdc_write(uint16_t addr, uint8_t val, void *priv)
fdc->pcn[fdc->params[0] & 3] -= fdc->params[1];
} else
fdc->pcn[fdc->params[0] & 3] = fdc->params[1];
fdc->interrupt = -3;
if (fdc->flags & FDC_FLAG_PCJR) {
fdc->fintr = 1;
fdc->interrupt = -4;
} else {
fdc->interrupt = -3;
fdc_callback(fdc);
}
break;
}
if (fdc->command & 0x80) {
@@ -1196,16 +1204,28 @@ fdc_write(uint16_t addr, uint8_t val, void *priv)
}
fdc->step = 1;
} else {
fdc->st0 = 0x20 | (fdc->params[0] & 7);
fdc->interrupt = -3;
fdc->st0 = 0x20 | (fdc->params[0] & 3);
if (fdc->flags & FDC_FLAG_PCJR) {
fdc->fintr = 1;
fdc->interrupt = -4;
} else {
fdc->interrupt = -3;
fdc_callback(fdc);
}
break;
}
} else {
fdc_log("Seeking to track %i (PCN = %i)...\n", fdc->params[1], fdc->pcn[fdc->params[0] & 3]);
if ((fdc->params[1] - fdc->pcn[fdc->params[0] & 3]) == 0) {
fdc_log("Failed seek\n");
fdc->st0 = 0x20 | (fdc->params[0] & 7);
fdc->interrupt = -3;
fdc->st0 = 0x20 | (fdc->params[0] & 3);
if (fdc->flags & FDC_FLAG_PCJR) {
fdc->fintr = 1;
fdc->interrupt = -4;
} else {
fdc->interrupt = -3;
fdc_callback(fdc);
}
break;
}
if (fdc->params[1] > fdc->pcn[fdc->params[0] & 3])
@@ -1715,7 +1735,7 @@ fdc_callback(void *priv)
fdc->interrupt = 0;
return;
case 0x0f: /*Seek*/
fdc->st0 = 0x20 | (fdc->params[0] & 7);
fdc->st0 = 0x20 | (fdc->params[0] & 3);
fdc->stat = 0x80 | (1 << fdc->rw_drive);
if (fdc->flags & FDC_FLAG_PCJR) {
fdc->fintr = 1;