Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!watmath!clyde!rutgers!sri-spam!ames!ucbcad!ucbvax!decvax!tektronix!uw-beaver!cornell!rochester!pt.cs.cmu.edu!andrew.cmu.edu!postman# From: postman#@andrew.cmu.edu.UUCP Newsgroups: comp.sys.ibm.pc Subject: Western Digital Controller Message-ID: Date: Fri, 30-Jan-87 20:22:41 EST Article-I.D.: andrew.MS.V3.20.kg0r.80020d02.mercer.ibm032.353.0 Posted: Fri Jan 30 20:22:41 1987 Date-Received: Sat, 31-Jan-87 19:40:25 EST Organization: Carnegie-Mellon University Lines: 19 ReSent-Date: Fri, 30 Jan 87 20:23:43 est ReSent-From: postman#@andrew.cmu.edu ReSent-To:nntp-xmit#@andrew.cmu.edu Return-path: To: outnews#ext.nn.comp.sys.ibm.pc@andrew.cmu.edu I just bought a used 20M hard disk from a friend, who had been using it as a 30M with an RLL controller. He also threw in a Western Digital controller, so I now have to reformat the disk for 20M. Unfortunately, he didn't give me any documentation (he couldn't find it.) The board has a whole bunch of pins on it for configuration, but there are no jumpers/shorting blocks. I cannibalized some jumpers from my multifunction card, but trial and error plugging and unplugging of jumpers hasn't placed anything meaningful at C800:0000. Can someone help me? I need to know what each group of pins is for, and/or what each combination of jumpers means. Kenneth Gober kg0r@andrew.cmu.edu P.S. I have found 1 jumper that exhibits interesting behavior. When I short the pins together, C800:0000 is flooded with 0xFF. When I take the jumper off, C800:0000 goes back to sequences of seemingly random 0xE8's and 0xE2's. Anyone have any idea what that jumper's for? The short slot? Is the EPROM on the card blank?