Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!rochester!rit!ultb!clf3678
From: clf3678@ultb.UUCP (C.L. Freemesser)
Newsgroups: comp.sys.atari.st
Subject: Re: TOS 1.4 vs NEODESK and UIS-II
Summary: Different chips for different machines
Message-ID: <433@ultb.UUCP>
Date: 13 Mar 89 21:03:57 GMT
References: <8903100344.AA03075@ucbvax.Berkeley.EDU> <418@ultb.UUCP> <8560@watcgl.waterloo.edu>
Reply-To: clf3678@ultb.UUCP (C.L. Freemesser (709ITP))
Organization: Rochester Institute of Technology, Information Systems
Lines: 15

I think a little history is needed.

The original 520 (which I own) and older 1040 machines used a set of 6
chips for it's ROMS.  I believe these are 256k chips.

The new ROMS are larger, and need more room.  Therfore, Atari used 2 1
meg chips.  The pin-outs on these chips differ, so you cannot just stick
the 1 meg chips into the 256k sockets.  To interface the two (if it can
be done), you need an interface board that will plug into the 6 sockets
and hold the two new chips.

Now this can be done, OR Atari can put out a smaller version of the new
ROMS that will fit into the 6 chip arrangement we have.

=cf=