Newsgroups: comp.sys.atari.st.tech
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!ghost.unimi.it!cdc835!ele9110
From: ele9110@cdc835.cdc.polimi.it (Oluzzi Massimo)
Subject: Re: HELP NEEDED: Memory Upgrades for ST
Message-ID: <1991May31.110757.16669@cdc835.cdc.polimi.it>
Keywords: memory upgrade
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References: <1991May28.142738.14487@noose.ecn.purdue.edu>
Date: Fri, 31 May 1991 11:07:57 GMT

defrain@ei.ecn.purdue.edu writes:

>Does anyone know the procedure for a piggy-back upgrade of a 512K
>520 ST to have 1MB? I cannot see from the schematic how to properely
>connect the addressing to the 256K DRAMs. Do other ICs need to be added?

>If someone has experience here and/or knows the fine detail of the procedure
>could you send a brief description of the various connections and necessary
>modifications.


There is a file, named "1megupgr.arc", which contains the infos requested.
I found it on sol.cs.ruu.nl (131.211.80.5), directory /ATARI-ST/doc .
Be kind to this ftp site, as they ask at connection time.

Bye,

					Massimo Oluzzi
					ele9110@cdc835.cdc.polimi.it