>--- Jeff Garrison <[EMAIL PROTECTED]> wrote:
>SCSI Utils made before any Mac had a dual SCSI bus
>will only see Bus 0. IIRC, a dual bus didn't come
>along
>until some of the 040 based Macs. As for PowerMacs,
>I think either the 7100 or 8100 was the first with
>a dual bus, one Fast SCSI II internal only and one
>normal SCSI internal/external.
>From what I've observed and read from Apple's TIL is that software that
wasn't written for multiple SCSI buses will see BOTH buses. When Apple
added support for multiple buses they created new system calls to access a
bus by specifying it's number. They kept the old calls and changed them to
access both buses. If there is something at the same address on more than
one bus things will not work. But if only one bus has something at the
specified address then it works as if it were a single bus system.
I found out about this because my scanner software doesn't understand
multiple buses and if it was using the same ID as something on the internal
bus #0 it wouldn't work.
--
Clark Martin
Redwood City, CA, USA
Macintosh / Internet Consulting
[EMAIL PROTECTED]
"I'm a designated driver on the Information Super Highway"
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