Hi,
At least the Quadra 900 and 950 have two SCSI buses, as deducted from Finn'ss
recent patch.
It is also possible to add SCSI buses. I have a NuBus SCSI card that has
a 53c9x chip of some flavor on it, although I haven't tried it and suspect
that it would take some work to get it supported in Linux. Having a NuBus
The 53C9x won't be that hard, but you'll have to write register access code
going through NUBUS instead of memory mapped IO. The NUBUS ethernet drivers
should have plenty of sample code. Leaves the exercise of locating the chip in
the slot address space :-)
SCSI card was a good option to upgrade performance of some of the mid-range
systems where Apple was still using the NCR5380 but better chips were
available. I'm pretty sure Apple supported booting off these as long as
they had the correct software in the ROM on the card.
Possible, but someone will just have to report what XPRAM data this would set.
And booting Linux off these without having a way of writing the kernel to that
bus won't make much sense.
Michael
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