Path: utzoo!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!samsung!zaphod.mps.ohio-state.edu!van-bc!johna
From: johna@van-bc.UUCP (John Altstadt)
Newsgroups: comp.sys.atari.st
Subject: Aerco 4 Meg ram upgrade boards
Message-ID: <131@van-bc.UUCP>
Date: 30 Dec 89 22:06:10 GMT
Reply-To: johna@van-bc.UUCP (John Altstadt)
Organization: Wimsey Associates
Lines: 32


Does anybody have any information on how to add 1 Meg chips to the
Aerco "easieST" solderless ram upgrade for a 520?  The literature
that came with the board claimed that the board would hold up to
4 Meg, but neglected to state how the extra ram should be added to
the sockets provided.  Since I could not afford the 1 Meg ram chips
when I bought the kit, I didn't bother finding out how it was done.

I tried the most obvious method of plugging the chips into the extra
sockets in the orientation implied by the dimple on the sockets
themselves.  This resulted in the ram test program insisting that I
had 2.5 Meg, but I wound up with 3 partial images of everything on
the screen.  The ram check program would crash with several bombs, the
number of bombs not repeatable.  Just for the fun of it, I removed all
but one of the extra chips, and had exactly the same results.  Now how
robust can the power-up memory check (not test) be if it will find ram
on the basis of one bit being set?

Any hints anybody?  Do I have to toss the board (it was ~ $250 back in
1987) and buy a different one?  For a little extra info, my ST has 
sticker saying it was made in 7 1985.

Does Aerco still exist?  They have not replied to a letter I sent
them on October 31 (I think that two months should be ample time
to reply).

John

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