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- From: johnh@jhunix.hcf.jhu.edu (John J Humpal)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Problems 2 RamCards installed
- Message-ID: <1992Aug18.163358.18927@jhunix.hcf.jhu.edu>
- Date: 18 Aug 92 16:33:58 GMT
- References: <1992Aug18.151305.4803@uni-paderborn.de>
- Organization: HAC - Johns Hopkins University, Baltimore
- Lines: 24
-
- In article <1992Aug18.151305.4803@uni-paderborn.de> caro@uni-paderborn.de (Carsten Rose) writes:
- >Hello,
- >
- >I have a A2000 with Board Rev 4.1 . The Computer works fine until I put
- >more than 1 cards in. With a 4Meg Ram Card all went fine. Adding
- >a second 2Meg Ram Card will cause strange GURU's after some well
- >worked minutes. The Gurus are so strange that I must switch off the Amiga
- >(no Keyboard Reset possible). Swapping the cards inside doesn't change
- >anything.
- >
- >I've heard of some changes to Motherboards Rev4.x . Does anyone have
- >a collection of them ?
- >
- I have a similar problem with a heavily loaded 2000 rev. 4.1
- I've been told that I should bring the board up to rev. 4.5. This
- entails adding some caps and resistors, especially some modification of
- a DTACK res and possibly a new Gary chip. The revs are in Commodore
- Tech Bulletin 25, I believe, which is supposedly only available to
- authorized Commodore Technical Repair people.
-
- --
- -John
-
- John J. Humpal -- johnh@jhunix.hcf.jhu.edu -- short .sig, std. disclaimer
-