Path: utzoo!utgpu!water!watmath!clyde!cbosgd!mandrill!neoucom!wtm
From: wtm@neoucom.UUCP (Bill Mayhew)
Newsgroups: comp.sys.att
Subject: Re: More HD on my 3b1.  How?
Summary: My 3B1 HDU gets power from the power pack
Message-ID: <969@neoucom.UUCP>
Date: 24 Jan 88 16:19:10 GMT
References: <7637@alice.UUCP> <176@bhjat.UUCP>
Organization: Northeastern Ohio Universities College of Medicine
Lines: 23


My 3B1 hard disk has a cable that runs straight to a connector on
the power pack module.  My first motherboard was that way.  When my
machine boots, it says something like "Main Board P3..P5" just
after the kernel loads.  There was a sticker on the first
motherboard I had that said "Rev E", I think.  When I got a strnage
panic message, AT&T decided to replace the motherboard a few weeks
ago.  The replacement board had obviously been in used some place
else, as there were marks of previous lock washers around the
screws, etc.  That board had a sticker that said "Rev H", I think.
Physically, both boards looked identical and had the very same
fix-up jumper wires.  Anyway, both motherboards had only a single
power socket for the floppy drive, though there were some solder
pads where a power cable for the hard disk could have been put.
Most of the ICs on my "new" motherbaord were date-coded about the
middle of 1986.

I don't know how feasible it might be to solder your drive power
cable right to the power pack.  I agree that it would be a good
idea to "cut out the middle man" and not send hard disk power
through the motherboard.

--Bill