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From: c152-ce@cory.Berkeley.EDU (Rob Pfile)
Newsgroups: comp.sys.mac
Subject: Q250 and SCSI bus questions
Keywords: HD40SC, Q250, Hard Disk
Message-ID: <9716@pasteur.Berkeley.EDU>
Date: 10 Feb 89 18:52:16 GMT
Sender: news@pasteur.Berkeley.EDU
Reply-To: c152-ce@cory.Berkeley.EDU (Rob Pfile)
Followup-To: comp.sys.mac
Distribution: usa
Organization: University of California, Berkeley
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	Recently, I purchased a Quantum Pro80S for my Mac II to replace my 
40 Meg internal Q250. Since my dad needed more storage for his Mac at home,
I packaged the disk in a Tulin Apple Hive, formatted it at a 3:1 interleave
with Apple HD Setup, and shipped it to him.

He received it yesterday, and it will not boot, although it worked great 
attached to my Mac II thru the external SCSI port.

The configuration is: Mac 512KE/new clock chip + Dove 1MB mem upgrade/SCSI port
attached to an Apple HD20SC, then to the HD40SC.

He says it wont boot even if the HD40SC is the only device connected.

The HD20SC is set to address 5, the HD40SC to addr 0.

Questions:

1) I suspect that this configuration is not terminated properly. Right now
   he only has one terminator, which I believe should go between the HD20 and
   the HD40, no? Is it possible that we need to terminate the HD40, too?
   (I know that this information is documented, but I dont have my Apple SCSI
   manual)

2) Is there a possibility that the Dove boards have problems addressing
   SCSI device 0? Might the Dove hardware want the devices to be consecutively
   numbered?

3) I wanted to set the HD40SC to be device 6 so that even without a Startup
   Device CDEV the 40Meg device would boot first. However, I do not have
   specs on the q250, aka HD40SC. Does anyone know the jumper pinout for
   this disk? Is this disk internally terminated?

Any other suggestions? Anyone there from Dove care to comment?

A hack that I tried was to have him boot the HD20 by turning off the HD40.
We found that the HD40 had to be disconnected, too. I then had him bring
up Paul Mercer's SCSI tools CDEV, connect and turn on the HD40, update the
bus status, and mount the disk. This worked for a second, but after an
HD40 Disk access, the machine froze. Also, on subsequent tries, sometimes
the bus status would indicate that the HD20 was gone from the bus on update.

With the whole mess hooked up (mac - hd20 - terminator - hd40) the mac
will not boot at all.

Does this sound like bus ringing, or what?

We need help on this one. He runs a small business and needs the
storage. Thanks.

Rob Pfile
c152-ce@cory.berkeley.edu
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