[2120] in linux-scsi channel archive
Re: Ancient 40MB Mac SCSI drive - is there hope?
daemon@ATHENA.MIT.EDU (doctor@fruitbat.org)
Mon Jul 7 16:56:58 1997
From: doctor@fruitbat.org
To: ray.ingles@fanucrobotics.com
Date: Mon, 7 Jul 1997 13:20:43 -0700 (PDT)
Cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <19970707152630888.AAA82@ras150.vortex.is> from "Risto Jouhki" at Jul 7, 97 03:26:31 pm
> I've checked the SCSI HOWTO andd the comp.peripherals.scsi FAQ, but
>neither of them seem to deal with this nearly unique problem.
>
> An old MAC SE I got back in '88 lost its picture tube a while ago, but
>it was still usable as a remote drive for a while longer. Eventually I
>gave up on it and put it away.
>
> Recently I got a SCSI controller to talk to a scanner, and I was
>interested in seeing if I could get some old data off that drive. I got
>the hsftools to talk to Mac floppies, so that part's fine. Next, I hooked
>up the drive to the SCSI bus and powered up everything...
>
> ...and the card locks up every time it tries to Test Unit Ready on ID=0
>Either on powerup or when the ncr53c8xx driver resets the card, the LED
>on the drive lights up and stays lit, and the whole system hangs.
>
> I tried powering down just the drive (I had it hooked to the Mac power
>supply (they both share a common ground, so I don't think it's any sort
>of power problem) and it can continue on from there, recognize the
>scanner at ID=6, and finish booting. Once it actually seemed partially
>successful in identifying the drive at that point (it printed:
Presumably the Mac drive was on the end of the SCSI chain when attached
to the Mac, and therefore has Termination enabled. I'd suggest that you
turn Termination off on which ever device is *NOT* at the physical end of
the SCSI bus. Only the last device in the chain should have Termination.
Your chain should look like this:
PC========[Mac drive]=====[scanner]=|
Something else to note: SCSI ID #0 and #1 are typically used as boot
devices on the PC when booting from a SCSI interface. I'd suggest
changing the SCSI ID of the MAC drive to 2 (or if the ncr53c8xx has a
bios setup, disable booting).
> VENDOR: SONY MODEL: SRD2040A
>
> ...or something like that, which is actually correct.) The drive did
>seem to work fine for a long time with the onboard NCR5380 chip on the
>Mac.
>
> Anyway, to sum up:
>
> Drive: Sony SRD2040A, SCSI-1, 40MB
> PC controller: NCR53c825.
>
> I just wanted to know if there was any hope or if I should just toss it
>out as broken... Does this sound like a termination problem? Is the Mac
>internal SCSI cable I'm using incompatible in some way?
Yes, this sounds like Termination could be a problem.
> Sincerely,
>
> Ray Ingles (248) 377-7735 ray.ingles@fanucrobotics.com
>
> "Every question has a simple, easy-to-understand wrong answer."
> -H. L. Mencken
--
Peter A. Castro (doctor@fruitbat.org) or (pcastro@us.oracle.com)
