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.