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Add emulation of IBM PS/1 Model 2121.

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As part of this :
- FDC Specify command now completes immediately
- Implemented keyboard system flag status
- Added ability to remap 384kb reserved memory to above extended memory
This commit is contained in:
SarahW 2016-05-02 20:06:49 +01:00
commit 0724cfcae4
20 changed files with 461 additions and 26 deletions
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39
src/fdc.c
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@ -34,7 +34,7 @@ typedef struct FDC
int tc;
int written;
int pcjr;
int pcjr, ps1;
int watchdog_timer;
int watchdog_count;
@ -574,6 +574,14 @@ bad_command:
fdc.inread = 1;
break;
case 3: /*Specify*/
fdc.stat=0x80;
fdc.specify[0] = fdc.params[0];
fdc.specify[1] = fdc.params[1];
fdc.dma = (fdc.specify[1] & 1) ^ 1;
disctime = 0;
break;
case 5: /*Write data*/
fdc_rate(fdc.drive);
fdc.head=fdc.params[2];
@ -675,7 +683,21 @@ uint8_t fdc_read(uint16_t addr, void *priv)
temp &= ~0x20;
break;
case 3:
if (!fdc.enh_mode)
drive = (fdc.dor & 1) ^ fdd_swap;
if (fdc.ps1)
{
/*PS/1 Model 2121 seems return drive type in port 0x3f3,
despite the 82077AA FDC not implementing this. This is
presumably implemented outside the FDC on one of the
motherboard's support chips.*/
if (fdd_is_525(drive))
temp = 0x20;
else if (fdd_is_ed(drive))
temp = 0x10;
else
temp = 0x00;
}
else if (!fdc.enh_mode)
temp = 0x20;
else
{
@ -800,12 +822,6 @@ void fdc_callback()
disc_readsector(fdc.drive, SECTOR_NEXT, fdc.track[fdc.drive], fdc.head, fdc.rate, fdc.params[4]);
fdc.inread = 1;
return;
case 3: /*Specify*/
fdc.stat=0x80;
fdc.specify[0] = fdc.params[0];
fdc.specify[1] = fdc.params[1];
fdc.dma = (fdc.specify[1] & 1) ^ 1;
return;
case 4: /*Sense drive status*/
fdc.res[10] = (fdc.params[0] & 7) | 0x28;
if (fdd_track0(fdc.drive))
@ -1330,6 +1346,7 @@ void fdc_add()
io_sethandler(0x03f0, 0x0006, fdc_read, NULL, NULL, fdc_write, NULL, NULL, NULL);
io_sethandler(0x03f7, 0x0001, fdc_read, NULL, NULL, fdc_write, NULL, NULL, NULL);
fdc.pcjr = 0;
fdc.ps1 = 0;
}
void fdc_add_pcjr()
@ -1337,6 +1354,7 @@ void fdc_add_pcjr()
io_sethandler(0x00f0, 0x0006, fdc_read, NULL, NULL, fdc_write, NULL, NULL, NULL);
timer_add(fdc_watchdog_poll, &fdc.watchdog_timer, &fdc.watchdog_timer, &fdc);
fdc.pcjr = 1;
fdc.ps1 = 0;
}
void fdc_remove()
@ -1360,3 +1378,8 @@ void fdc_3f1_enable(int enable)
{
fdc.enable_3f1 = enable;
}
void fdc_set_ps1()
{
fdc.ps1 = 1;
}