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Added support for Tandy 1000 HX and SL/2. As part of this commit :

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- FDC now selects drive number from DOR (0x3f2)
- FDC now fails seeks on drives > 1
- XT systems no longer have BIOS mapping at E0000-EFFFF
- SN76489 now distinguishes between SN76496 (PCjr and early Tandy 1000), NCR8496 (later Tandy 1000 - different noise handling) and PSSJ
- Removed redundant limits on memory configuration - allows selection of 768k for Tandy 1000 SL/2
This commit is contained in:
TomW 2015-12-03 21:48:10 +00:00
commit 2ca86ba028
24 changed files with 1420 additions and 64 deletions
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16
src/fdc.c
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@ -120,6 +120,7 @@ void fdc_write(uint16_t addr, uint8_t val, void *priv)
fdc_reset();
}
motoron = val & 0x01;
fdc.drive = 0;
/* if (motoron)
output = 3;
else
@ -143,6 +144,7 @@ void fdc_write(uint16_t addr, uint8_t val, void *priv)
timer_process();
motoron = (val & 0xf0) ? 1 : 0;
timer_update_outstanding();
fdc.drive = val & 3;
}
fdc.dor=val;
// printf("DOR now %02X\n",val);
@ -299,7 +301,7 @@ void fdc_write(uint16_t addr, uint8_t val, void *priv)
timer_process();
disctime = 1024 * (1 << TIMER_SHIFT);
timer_update_outstanding();
fdc.drive = fdc.params[0] & 3;
// fdc.drive = fdc.params[0] & 3;
disc_drivesel = fdc.drive & 1;
fdc_reset_stat = 0;
switch (discint)
@ -456,7 +458,7 @@ uint8_t fdc_read(uint16_t addr, void *priv)
break;
case 7: /*Disk change*/
if (fdc.dor & (0x10 << (fdc.dor & 1)))
temp = (disc_changed[fdc.dor & 1] || drive_empty[fdc.dor & 1])?0x80:0;
temp = (disc_changed[fdc.drive] || drive_empty[fdc.drive]) ? 0x80 : 0;
else
temp = 0;
if (fdc.dskchg_activelow) /*PC2086/3086 seem to reverse this bit*/
@ -626,7 +628,10 @@ void fdc_callback()
case 7: /*Recalibrate*/
fdc.track[fdc.drive]=0;
// if (!driveempty[fdc.dor & 1]) discchanged[fdc.dor & 1] = 0;
fdc.st0 = 0x20 | (fdc.params[0] & 3) | (fdc.head?4:0);
if (fdc.drive <= 1)
fdc.st0 = 0x20 | (fdc.params[0] & 3) | (fdc.head?4:0);
else
fdc.st0 = 0x68 | (fdc.params[0] & 3) | (fdc.head?4:0);
discint=-3;
timer_process();
disctime = 2048 * (1 << TIMER_SHIFT);
@ -708,7 +713,10 @@ void fdc_callback()
fdc.track[fdc.drive]=fdc.params[1];
// if (!driveempty[fdc.dor & 1]) discchanged[fdc.dor & 1] = 0;
// printf("Seeked to track %i %i\n",fdc.track[fdc.drive], fdc.drive);
fdc.st0 = 0x20 | (fdc.params[0] & 3) | (fdc.head?4:0);
if (fdc.drive <= 1)
fdc.st0 = 0x20 | (fdc.params[0] & 3) | (fdc.head?4:0);
else
fdc.st0 = 0x68 | (fdc.params[0] & 3) | (fdc.head?4:0);
discint=-3;
timer_process();
disctime = 2048 * (1 << TIMER_SHIFT);