Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ames!amdahl!pyramid!ctnews!starfish!cdold
From: cdold@starfish.Convergent.COM (Clarence Dold)
Newsgroups: comp.sys.ibm.pc
Subject: Re: ROMS for IBM AT compatiables
Message-ID: <625@starfish.Convergent.COM>
Date: 9 Aug 88 17:05:30 GMT
References: <5136@killer.DALLAS.TX.US>
Distribution: na
Organization: Convergent Technologies, San Jose, CA
Lines: 21

From article <5136@killer.DALLAS.TX.US>, by egs@killer.DALLAS.TX.US (Eric Schnoebelen):
> 	I am trying to add a second hard disk controller to my AT/386
> clone.  I know it can be done, but the question is how.  
> 	WD1003-WA2 type primary controller,
> 	Western Digital WD1003-WAH secondary controller,
> 	AMI ROM BIOS
> 		Eric Schnoebelen
> 		u-word!egs@killer.dallas.tx.us

If these are 'XT' controllers, they are mapping into the same address range, 
hence the POST failure.
With the Miniscribe Scribecard 80SC, there is a jumper W2, that changes one
bit of the address, shifting it to a secondary address.  I have run a WD
controller as drive C:, with the Scribe as D:.  Because the XT controller
actually becomes part of the BIOS, the BIOS shouldn't be a problem,
but you will have to find which bit to cut and move, since WD doesn't 
have a jumper for this purpose.  (My WD has no jumpers)
The AWARDS BIOS looks for controllers at every 2K block from C800 - E000.
The controller is almost certainly at C800 now.
You can check for success in the readdressing: The first two bytes of 
the controller ROM should be 55AA, indicating a bootable device.