Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!mailrus!ncar!ames!uhccux!virtue!hamish
From: hamish@waikato.ac.nz
Newsgroups: comp.sys.amiga.hardware
Subject: Re: old A2000 MMU/CPU memory board
Message-ID: <726.267666df@waikato.ac.nz>
Date: 13 Jun 90 04:16:30 GMT
References: <145@cutmcvax.OZ> <12579@cbmvax.commodore.com>
Organization: University of Waikato, Hamilton, New Zealand
Lines: 41

In article <12579@cbmvax.commodore.com>, grr@cbmvax.commodore.com (George Robbins) writes:
> In article <145@cutmcvax.OZ> mestona@cutmcvax.oz (meston anthony) writes:
>> I have an _OLD_ A2000 (you know, not the B2000) that has 512k chip on the main
>> mother board. (sob..) The machine has a memory board in the CPU slot with 512k
>> soldered, and sockets for another 512k AND.... FIVE JUMPERS... I found some
>> memory and put it in.
> 
> These boards were made as a stopgap when it was decided that the A2000 should
> have 1M total memory, even though the PCB only only had provision for 512K of
> memory.  Adding memory to the additional sockets isn't supported and tends to
> not work especially well.
> 
> You're better off just getting an Commodore A2058 or equivalent 3-rd party
> memory expansion.  If your expansion card works reliably keep it, otherwise
> yank it and stick more chips in the Zorro expansion card.
>

Hmmm... I know many people who are stuck with the old Rev 4 motherboard, that
has the discrete agnus chip (ala A1000) and they all have the extra 512k of
RAM populated in their machines. Nobody that I know of has ever had any
problems with it.

I can't remember the positinos of the jumpers, but it has been on the net
before. If you can't fins it in the archives send me some email and I'll 
look under the hood at home. (Mine has one as well). 
 
> -- 
> George Robbins - now working for,     uucp:   {uunet|pyramid|rutgers}!cbmvax!grr
> but no way officially representing:   domain: grr@cbmvax.commodore.com
> Commodore, Engineering Department     phone:  215-431-9349 (only by moonlite)
-- 
==============================================================================
|  Hamish Marson                        |  Internet  hamish@waikato.ac.nz    |
|  Computer Support Person              |  Phone  (071)562889 xt 8181        |
|  Computer Science Department          |  Amiga 3000 for ME!                |
|  University of Waikato                |                                    |
==============================================================================
|Disclaimer:  Anything said in this message is the personal opinion of the   |
|             finger hitting the keyboard & doesn't represent my employers   |
|             opinion in any way. (ie we probably don't agree)               |
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