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Improve FDC reset handling. Fixes floppy access in Windows 9x.

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This commit is contained in:
TomW 2015-11-15 14:08:39 +00:00
commit d3c2d455b9
1 changed files with 11 additions and 15 deletions
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26
src/fdc.c
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@ -60,7 +60,7 @@ void fdc_reset()
{
fdc.stat=0x80;
fdc.pnum=fdc.ptot=0;
fdc.st0=0xC0;
fdc.st0=0;
fdc.lock = 0;
fdc.head = 0;
fdc.abort = 0;
@ -301,6 +301,7 @@ void fdc_write(uint16_t addr, uint8_t val, void *priv)
timer_update_outstanding();
fdc.drive = fdc.params[0] & 3;
disc_drivesel = fdc.drive & 1;
fdc_reset_stat = 0;
switch (discint)
{
case 2: /*Read a track*/
@ -350,7 +351,6 @@ void fdc_write(uint16_t addr, uint8_t val, void *priv)
break;
case 7: /*Recalibrate*/
fdc_reset_stat = 0;
fdc.stat = 1 << fdc.drive;
disctime = 0;
disc_seek(fdc.drive, 0);
@ -493,7 +493,7 @@ void fdc_callback()
case -1: /*Reset*/
//rpclog("Reset\n");
fdc_int();
fdc_reset_stat = 5;
fdc_reset_stat = 4;
return;
case 2: /*Read track*/
readflash = 1;
@ -637,21 +637,17 @@ void fdc_callback()
case 8: /*Sense interrupt status*/
// pclog("Sense interrupt status %i\n", fdc_reset_stat);
fdc.dat = fdc.st0;
fdc.stat = (fdc.stat & 0xf) | 0xd0;
if (fdc_reset_stat)
{
fdc_reset_stat--;
if (!fdc_reset_stat)
fdc.st0 = 0;
else
fdc.st0 = (fdc.st0 & 0xf8) | (4 - fdc_reset_stat) | (fdc.head ? 4 : 0);
}
fdc.stat = (fdc.stat & 0xf) | 0xd0;
fdc.res[9] = fdc.st0;
fdc.res[9] = 0xc0 | (4 - fdc_reset_stat) | (fdc.head ? 4 : 0);
else
fdc.res[9] = fdc.st0;
fdc.res[10] = fdc.track[fdc.drive];
if (!fdc_reset_stat) fdc.st0 = 0x80;
if (!fdc_reset_stat)
fdc.st0 = 0x80;
else
fdc_reset_stat--;
paramstogo = 2;
discint = 0;