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From: raymund@sci.UUCP (Raymund Galvin)
Newsgroups: net.micro.pc,net.micro
Subject: Re: XT controller for two hard disks.
Message-ID: <231@sci.UUCP>
Date: Mon, 22-Sep-86 11:23:10 EDT
Article-I.D.: sci.231
Posted: Mon Sep 22 11:23:10 1986
Date-Received: Tue, 23-Sep-86 04:21:31 EDT
References: <332@mit-amt.MIT.EDU> <7739@lanl.ARPA>
Organization: Silicon Compilers, Inc., San Jose, CA
Lines: 23
Xref: mnetor net.micro.pc:6607 net.micro:6100

In article <7739@lanl.ARPA>, myxm@lanl.ARPA (Mike Mitchell) writes:
> > I  need to control  two 10 Megabyte  hard disks  from  one  XT. The XT
> > already controls one 10M hard disk  using the original IBM controller.
> 
> The IBM controllers that I have seen were made by XEBEC. These controllers
> have the capability of running two hard disks. You can tell if your controller
> will do this by looking at the place where the cables connect to it. You
> should see three rows of staking pins. One should be 34 connecters and the
> other two should be 20. If your controller is set up like this then all you
> will need are the cables to hook up the drives. The 20 position cables have
> nothing special to them. They run straight through. The 34 position cable has
> a twist in it going to drive D (similar to the way the floppy cable has a
> twist in it going to Drive A). .........
> Hope this helps. 
> 
> Mike Mitchell
> myxm@lanl.arpa
I hooked two 10M drives to the XEBEC  controller in an ITT XTRA.  The cable 
twisting was avoided by setting the second hard disk to respond as drive 1 - 
not drive 0.   I believe the twist in the cable is used so both drives can
be configured as drive 0.

Ray Galvin