Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!brl-adm!rutgers!dayton!meccts!meccsd!mecc!zeke!todd From: todd@zeke.UUCP (Todd Burkey) Newsgroups: comp.sys.atari.st Subject: Re: Hard Disk Problem {BIZZARE} Message-ID: <131@zeke.UUCP> Date: Mon, 12-Jan-87 11:10:25 EST Article-I.D.: zeke.131 Posted: Mon Jan 12 11:10:25 1987 Date-Received: Tue, 13-Jan-87 07:24:00 EST References: <1014@chinet.UUCP> Reply-To: todd@zeke.UUCP (Todd Burkey) Distribution: world Organization: Zycad Corporation, St. Paul, Mn Lines: 15 In article <1014@chinet.UUCP> cabbie@chinet.UUCP (Richard Andrews) writes: >ideas. His machine is a 1 meg 520 with piggybacked chips (both installed >by me) and TOS is in ROM. My machine has the modulator and his doesn't, You might want to look for noise on the RAM data/address lines. I had the same problem because too thin a wire was used on my 1Meg upgrade. A fairly thick wire is actually needed to reduce noise (reflections, etc). -Todd Burkey ..!mecc!zeke!todd -- -Todd Burkey ZYCAD Corporation ..!mecc!zeke!todd