Retro/pcem
Watch
1
0
Fork
You've already forked pcem
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Re-implemented FDC Read a Track command. King's Quest 1 booter works again.

Browse source
This commit is contained in:
TomW 2015-10-04 17:52:38 +01:00
commit fba5891d95
4 changed files with 56 additions and 39 deletions
Download patch file Download diff file Expand all files Collapse all files

69
src/fdc.c
View file

@ -176,6 +176,12 @@ void fdc_write(uint16_t addr, uint8_t val, void *priv)
// pclog("Starting FDC command %02X\n",fdc.command);
switch (fdc.command&0x1F)
{
case 2: /*Read track*/
fdc.pnum=0;
fdc.ptot=8;
fdc.stat=0x90;
fdc.pos=0;
break;
case 3: /*Specify*/
fdc.pnum=0;
fdc.ptot=2;
@ -297,6 +303,20 @@ void fdc_write(uint16_t addr, uint8_t val, void *priv)
disc_drivesel = fdc.drive & 1;
switch (discint)
{
case 2: /*Read a track*/
fdc.track[fdc.drive]=fdc.params[1];
fdc.head=fdc.params[2];
fdc.sector=fdc.params[3];
fdc.eot[fdc.drive] = fdc.params[5];
if (fdc.config & 0x40)
disc_seek(fdc.drive, fdc.track[fdc.drive]);
// pclog("Read a track track=%i head=%i sector=%i eot=%i\n", fdc.track[fdc.drive], fdc.head, fdc.sector, fdc.eot[fdc.drive]);
disc_readsector(fdc.drive, SECTOR_FIRST, fdc.track[fdc.drive], fdc.head, fdc.rate);
disctime = 0;
readflash = 1;
fdc.inread = 1;
break;
case 5: /*Write data*/
fdc.track[fdc.drive]=fdc.params[1];
fdc.head=fdc.params[2];
@ -476,49 +496,28 @@ void fdc_callback()
fdc_reset_stat = 5;
return;
case 2: /*Read track*/
/* if (!fdc.pos)
readflash = 1;
fdc.eot[fdc.drive]--;
// pclog("Read a track callback, eot=%i\n", fdc.eot[fdc.drive]);
if (!fdc.eot[fdc.drive] || fdc.tc)
{
// printf("Read Track Side %i Track %i Sector %02X sector size %i end sector %02X %05X\n",fdc.head,fdc.track,fdc.sector,fdc.params[4],fdc.params[5],(dma.page[2]<<16)+dma.ac[2]);
}
if (fdc.pos<512)
{
fdc.dat=disc[fdc.drive][fdc.head][fdc.track[fdc.drive]][fdc.sector-1][fdc.pos];
// pclog("Read %i %i %i %i %02X\n",fdc.head,fdc.track,fdc.sector,fdc.pos,fdc.dat);
if (fdc.pcjr)
fdc.stat = 0xf0;
else
dma_channel_write(2, fdc.dat);
timer_process();
disctime = 60 * (1 << TIMER_SHIFT);
timer_update_outstanding();
}
else
{
disctime=0;
// pclog("Complete\n");
fdc.inread = 0;
discint=-2;
// pclog("RT\n");
fdc_int();
fdc.stat=0xD0;
fdc.res[4]=(fdc.head?4:0)|fdc.drive;
fdc.res[5]=fdc.res[2]=0;
fdc.res[6]=fdc.track[fdc.drive];
fdc.res[7]=fdc.head;
fdc.res[8]=fdc.sector;
fdc.res[9]=fdc.params[4];
fdc.res[5]=fdc.res[6]=0;
fdc.res[7]=fdc.track[fdc.drive];
fdc.res[8]=fdc.head;
fdc.res[9]=fdc.sector;
fdc.res[10]=fdc.params[4];
paramstogo=7;
return;
}
fdc.pos++;
if (fdc.pos==512 && fdc.params[5]!=1)
{
fdc.pos=0;
fdc.sector++;
if (fdc.sector==SECTORS[fdc.drive]+1)
{
fdc.sector=1;
}
fdc.params[5]--;
}*/
else
disc_readsector(fdc.drive, SECTOR_NEXT, fdc.track[fdc.drive], fdc.head, fdc.rate);
fdc.inread = 1;
return;
case 3: /*Specify*/
fdc.stat=0x80;