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More fixes for 5380-based SCSI chips of the day (March 29th, 2025)

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1. Avoid audio stops when they don't need to be.
2. And improved the MMIO-based NCR 53c400 timings to be similar to the port I/O-based one (T130B).
3. Minor timing fixes to the T128/PAS as well (especially for the hdd, when entering Windows 1.x using a SCSI HDD).
This commit is contained in:
TC1995
2025-03-29 14:24:20 +01:00
parent bb22e1dccb
commit 6d43f7e2df
3 changed files with 77 additions and 35 deletions
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15
src/scsi/scsi_t128.c
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@@ -95,9 +95,10 @@ t128_write(uint32_t addr, uint8_t val, void *priv)
t128->status, scsi_bus->period, timer_is_enabled(&t128->timer), t128->block_loaded);
t128->status &= ~0x04;
timer_on_auto(&t128->timer, 10.0);
timer_on_auto(&t128->timer, 1.0);
}
}
} else
t128_log("Write not allowed.\n");
}
}
@@ -136,20 +137,18 @@ t128_read(uint32_t addr, void *priv)
t128_log("T128 Transfer busy read, status=%02x, period=%lf, enabled=%d.\n",
t128->status, scsi_bus->period, timer_is_enabled(&t128->timer));
t128->status &= ~0x04;
if (!t128->block_loaded) {
ncr->isr |= STATUS_END_OF_DMA;
if (ncr->mode & MODE_ENA_EOP_INT) {
t128_log("T128 read irq\n");
ncr5380_irq(ncr, 1);
}
t128->status &= ~0x04;
scsi_bus->bus_out |= BUS_CD;
scsi_bus->tx_mode = PIO_TX_BUS;
timer_stop(&t128->timer);
} else if (!timer_is_enabled(&t128->timer))
timer_on_auto(&t128->timer, 10.0);
else
t128->status &= ~0x04;
timer_on_auto(&t128->timer, 1.0);
}
} else {
/*According to the WinNT DDK sources, just get the status timeout bit from here.*/
@@ -522,6 +521,10 @@ t128_init(const device_t *info)
scsi_bus->speed = 0.2;
scsi_bus->divider = 1.0;
scsi_bus->multi = 1.0;
for (int i = 0; i < 8; i++)
scsi_device_reset(&scsi_devices[ncr->bus][i]);
return t128;
}