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D86F: Always wait for two index pulses on wrong DENSEL and do it in Turbo mode as well, fixes floppies in Windows 95 when booted with a floppy inserted.

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This commit is contained in:
OBattler
2025-07-31 23:37:13 +02:00
parent 3ef7f82c78
commit 437ecbde6c
2 changed files with 75 additions and 44 deletions
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2
src/floppy/fdd.c
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@@ -539,7 +539,7 @@ fdd_hole(int drive)
static __inline uint64_t
fdd_byteperiod(int drive)
{
if (!fdd_get_turbo(drive) && drives[drive].byteperiod)
if (drives[drive].byteperiod)
return drives[drive].byteperiod(drive);
else
return 32ULL * TIMER_USEC;

117
src/floppy/fdd_86f.c
View File

@@ -758,36 +758,43 @@ d86f_get_encoding(int drive)
uint64_t
d86f_byteperiod(int drive)
{
double dusec = (double) TIMER_USEC;
double p = 2.0;
d86f_t *dev = d86f[drive];
uint64_t ret = 32ULL * TIMER_USEC;
switch (d86f_track_flags(drive) & 0x0f) {
case 0x02: /* 125 kbps, FM */
p = 4.0;
break;
case 0x01: /* 150 kbps, FM */
p = 20.0 / 6.0;
break;
case 0x0a: /* 250 kbps, MFM */
case 0x00: /* 250 kbps, FM */
default:
p = 2.0;
break;
case 0x09: /* 300 kbps, MFM */
p = 10.0 / 6.0;
break;
case 0x08: /* 500 kbps, MFM */
p = 1.0;
break;
case 0x0b: /* 1000 kbps, MFM */
p = 0.5;
break;
case 0x0d: /* 2000 kbps, MFM */
p = 0.25;
break;
if (!fdd_get_turbo(drive) || (dev->version != 0x0063) || (dev->state == STATE_SECTOR_NOT_FOUND)) {
double dusec = (double) TIMER_USEC;
double p = 2.0;
switch (d86f_track_flags(drive) & 0x0f) {
case 0x02: /* 125 kbps, FM */
p = 4.0;
break;
case 0x01: /* 150 kbps, FM */
p = 20.0 / 6.0;
break;
case 0x0a: /* 250 kbps, MFM */
case 0x00: /* 250 kbps, FM */
default:
p = 2.0;
break;
case 0x09: /* 300 kbps, MFM */
p = 10.0 / 6.0;
break;
case 0x08: /* 500 kbps, MFM */
p = 1.0;
break;
case 0x0b: /* 1000 kbps, MFM */
p = 0.5;
break;
case 0x0d: /* 2000 kbps, MFM */
p = 0.25;
break;
}
ret = (uint64_t) (p * dusec);
}
return (uint64_t) (p * dusec);
return ret;
}
int
@@ -2463,16 +2470,17 @@ d86f_poll(int drive)
dev->state = STATE_SECTOR_NOT_FOUND;
}
if (fdd_get_turbo(drive) && (dev->version == 0x0063)) {
d86f_turbo_poll(drive, side);
return;
}
if ((dev->state != STATE_IDLE) && (dev->state != STATE_SECTOR_NOT_FOUND) && ((dev->state & 0xF8) != 0xE8)) {
if (!d86f_can_read_address(drive))
dev->state = STATE_SECTOR_NOT_FOUND;
}
/* Do normal poll if DENSEL is wrong, because Windows 95 is very strict about timings there. */
if (fdd_get_turbo(drive) && (dev->version == 0x0063) && (dev->state != STATE_SECTOR_NOT_FOUND)) {
d86f_turbo_poll(drive, side);
return;
}
if ((dev->state != STATE_02_SPIN_TO_INDEX) && (dev->state != STATE_0D_SPIN_TO_INDEX))
d86f_get_bit(drive, side ^ 1);
@@ -2577,12 +2585,6 @@ d86f_poll(int drive)
d86f_advance_bit(drive, side);
if (d86f_wrong_densel(drive) && (dev->state != STATE_IDLE)) {
dev->state = STATE_IDLE;
fdc_noidam(d86f_fdc);
return;
}
if ((dev->index_count == 2) && (dev->state != STATE_IDLE)) {
switch (dev->state) {
case STATE_0A_FIND_ID:
@@ -3277,7 +3279,12 @@ d86f_readsector(int drive, int sector, int track, int side, int rate, int sector
if (!ret)
return;
if (sector == SECTOR_FIRST)
if (d86f_wrong_densel(drive)) {
dev->state = STATE_SECTOR_NOT_FOUND;
if (fdd_get_turbo(drive))
dev->track_pos = 0;
} else if (sector == SECTOR_FIRST)
dev->state = STATE_02_SPIN_TO_INDEX;
else if (sector == SECTOR_NEXT)
dev->state = STATE_02_FIND_ID;
@@ -3302,7 +3309,13 @@ d86f_writesector(int drive, int sector, int track, int side, int rate, int secto
if (!ret)
return;
dev->state = fdc_is_deleted(d86f_fdc) ? STATE_09_FIND_ID : STATE_05_FIND_ID;
if (d86f_wrong_densel(drive)) {
dev->state = STATE_SECTOR_NOT_FOUND;
if (fdd_get_turbo(drive))
dev->track_pos = 0;
} else
dev->state = fdc_is_deleted(d86f_fdc) ? STATE_09_FIND_ID : STATE_05_FIND_ID;
}
void
@@ -3315,7 +3328,13 @@ d86f_comparesector(int drive, int sector, int track, int side, int rate, int sec
if (!ret)
return;
dev->state = STATE_11_FIND_ID;
if (d86f_wrong_densel(drive)) {
dev->state = STATE_SECTOR_NOT_FOUND;
if (fdd_get_turbo(drive))
dev->track_pos = 0;
} else
dev->state = STATE_11_FIND_ID;
}
void
@@ -3336,7 +3355,13 @@ d86f_readaddress(int drive, UNUSED(int side), UNUSED(int rate))
dev->id_found = 0;
dev->dma_over = 0;
dev->state = STATE_0A_FIND_ID;
if (d86f_wrong_densel(drive)) {
dev->state = STATE_SECTOR_NOT_FOUND;
if (fdd_get_turbo(drive))
dev->track_pos = 0;
} else
dev->state = STATE_0A_FIND_ID;
}
void
@@ -3438,7 +3463,13 @@ d86f_common_format(int drive, int side, UNUSED(int rate), uint8_t fill, int prox
dev->index_count = dev->error_condition = dev->satisfying_bytes = dev->sector_count = 0;
dev->dma_over = 0;
dev->state = STATE_0D_SPIN_TO_INDEX;
if (d86f_wrong_densel(drive) && !proxy) {
dev->state = STATE_SECTOR_NOT_FOUND;
if (fdd_get_turbo(drive))
dev->track_pos = 0;
} else
dev->state = STATE_0D_SPIN_TO_INDEX;
}
void