Re: //gs + Apple High Speed SCSI + Quantum Drive == $#!+!!!!

[dempson@actrix.gen.nz (David Empson)]

In article <249@uplink.cichlid.com>,
Dameon D. Welch <@uplink.cichlid.com> wrote:
> 
> Got an Apple ][gs with an Apple High Speed SCSI card. Hook up my
> SyQuest 270 to it (overkill, but...). Works. Boots off SyQuest, etc,
> no problems. Now, I add in my Quantum 80 meg that I pulled out of my
> Mac SE/30 (internal drive) and take out my SyQuest cartridge (so it
> won't boot off the SyQuest). All works fine. (Boots off the Quantum
> drive) 

You could also achieve this by reversing the order of the SCSI IDs.
The Apple SCSI cards attempt to boot from the device with the highest
SCSI ID.  I wasn't aware that they then tried lower devices if that
one isn't bootable.

> Disconnect the SyQuest drive from SCSI chain. (Yes, everything is
> correctly terminated). Now ][gs refuses to recognize the Quantum
> drive at all (doesn't exist according to Apple's SCSI utils).
> 
> The Quantum drive is Externally terminated, BTW. Should the Quantum
> drive be internally terminated (I'd rather have it externally
> terminated)? 

In theory, it should make no difference.

It might be a problem with supply of power for the SCSI terminators.
If the SyQuest is supplying power and the Quantum isn't, then the
Quantum may not work by itself.
-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand