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From: defrain@ei.ecn.purdue.edu
Newsgroups: comp.sys.atari.st.tech
Subject: HELP NEEDED: Memory Upgrades for ST
Keywords: memory upgrade
Message-ID: <1991May28.142738.14487@noose.ecn.purdue.edu>
Date: 28 May 91 14:27:38 GMT
Sender: Paul D. DeFrain
Followup-To: defrain@ecn.purdue.edu
Organization: Purdue Electrical & Biomedical Engineering
Lines: 19

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.

the balance of future computing history weighs heavy in your hands,

Paul


.............................................................................
Paul D. DeFrain                  : "Physical concepts are free creations of  :
Purdue University,               :  the human mind, and are not, however it  :
Dept. of Electrical Engineering  :  may seem, uniquely determined by the ex- :
defrain@ecn.purdue.edu           :  ternal world."  ---  A. Einstien         :
(317)49-43556 (am), 497-9903     : ......................................... :