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More bugfixes to the FDC SENSE INTERRUPT STATUS COMMAND, now PCjr, the MR 386DX BIOS, and Red Hat Linux 2.0 are all happy.

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This commit is contained in:
OBattler
2018-02-02 19:50:38 +01:00
parent cd5fc04c44
commit 4452b4e278
1 changed files with 12 additions and 4 deletions
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16
src/floppy/fdc.c
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@@ -9,7 +9,7 @@
* Implementation of the NEC uPD-765 and compatible floppy disk
* controller.
*
* Version: @(#)fdc->c 1.0.14 2018/02/02
* Version: @(#)fdc->c 1.0.15 2018/02/02
*
* Authors: Sarah Walker, <http://pcem-emulator.co.uk/>
* Miran Grca, <mgrca8@gmail.com>
@@ -611,7 +611,7 @@ fdc_implied_seek(fdc_t *fdc)
static void
fdc_bad_command(fdc_t *fdc)
{
fdc->stat |= 0x10;
fdc->stat = 0x10;
fdc->interrupt = 0xfc;
timer_clock();
fdc->time = 200LL * (1LL << TIMER_SHIFT);
@@ -663,8 +663,14 @@ fdc_sis(fdc_t *fdc)
fdc->reset_stat--;
} else {
fdc->res[9] = (fdc->st0 & ~0x04) | (fdd_get_head(fdc->drive & 0x03) ? 4 : 0);
fdc->fintr = 0;
if (fdc->fintr) {
fdc->res[9] = (fdc->st0 & ~0x04) | (fdd_get_head(fdc->drive & 0x03) ? 4 : 0);
fdc->fintr = 0;
} else {
fdc->res[10] = 0x80;
fdc->paramstogo = 1;
return;
}
}
fdc->res[10] = fdc->pcn[fdc->res[9] & 3];
@@ -1008,6 +1014,7 @@ fdc_write(uint16_t addr, uint8_t val, void *priv)
fdc->stat = (1 << real_drive(fdc, fdc->drive)) | 0x80;
fdc->st0 = fdc->drive & 0x03;
fdc->st0 |= fdd_get_head(real_drive(fdc, fdc->drive)) ? 0x04 : 0x00;
fdc->st0 |= 0x80;
fdc->time = 0LL;
drive_num = real_drive(fdc, fdc->drive);
/* Three conditions under which the command should fail. */
@@ -1046,6 +1053,7 @@ fdc_write(uint16_t addr, uint8_t val, void *priv)
fdc->head = (fdc->params[0] & 4) ? 1 : 0;
fdc->st0 = fdc->drive & 0x03;
fdc->st0 |= (fdc->params[0] & 4);
fdc->st0 |= 0x80;
fdd_set_head(real_drive(fdc, fdc->drive), (fdc->params[0] & 4) ? 1 : 0);
fdc->time = 0LL;
drive_num = real_drive(fdc, fdc->drive);