Re: SyQuest and Apple DMA SCSI card

[jmk3@crux3.cit.cornell.edu (Jay M. Krell)]

>From: slhood@bluemoon.use.com (Stephen L. Hood)
>Subject: SyQuest and Apple DMA SCSI card
 
>I have an Apple DMA SCSI card in my ROM 01 IIGS.  I am using a SyQuest 44
>megabyte removable hard drive and a Quantum 85 megabyte hard drive with
>this card.  After several severe headaches, I was able to get both drives
>working together (and with the proper partition booting first) by manually
>yanking all internal resistors and terminating the chain externally.  The
>system now boots the Quantum 85 properly.
 
Steve,
  I've got a similar setup, 44 MB SyQuest and 40 MB Quantum ProDrive. Each
drive worked seperately with their interal terminators. Strange thing is that
daisy-chained with the last one externally terminated (internal term removed),
they only work in one order. In the other order, the system is very flaky,
indicating termination problems.
 
>ProDOS 8 hangs if Syquest has no cart.
 
I have the same problem. It doesn't happen if the Syquest is off, which is
usually the case for me. For what its worth, I reported this to
apple.bugs@applelink.apple.com as a ProDOS 8 bug.
 
 
>2.  From GS/OS, it usually takes two to three tries before the GS
>recognizes an inserted cartridge.  Since inserting a cartridge and waiting
>for it to spin up to speed takes over 15 seconds, this gets to be
 
The only GS/OS problem I have is that a cart must be in during boot for the
drive to be recognized. Insertions and ejections are recognized immediately
provided the drive is being polled, as in Finder, Standard File dialogs, and
new apps that call HandleDiskInsert in their event loop.
 
>I'm pretty sure this is the fault of the Apple DMA SCSI card, which I know
>isn't exactly the best at handling removable media.  My question, then, is
 
The Rev C card had problems with removable media, but the DMA card is supposed
to have fixed them.
 
>is there a GS/OS driver available for the SyQuest and the DMA SCSI
 
I think not.
 
  --Jay, jay.krell@cornell.edu