Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!usc!zaphod.mps.ohio-state.edu!tut.cis.ohio-state.edu!ucbvax!DOCKMASTER.NCSC.MIL!JHSangster
From: JHSangster@DOCKMASTER.NCSC.MIL
Newsgroups: comp.sys.atari.8bit
Subject: Re: INFO-ATARI8 Digest V90 #30
Message-ID: <900310044119.739566@DOCKMASTER.NCSC.MIL>
Date: 10 Mar 90 04:41:00 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
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Re:  CPU upgrades...  Jim Tittsler of Atari ("sort of a hardware guy" he
calls himself, I think that means chief hardware engineer or something)
once emailed me a note saying that he thought you could drop a 65802
chip right into an Atari 800, and you could probably also make up a
little board to plug one into an 800XL or 130XE, by cribbing the
tri-state driver circuitry out of the 800 schematic (it's included in
the custom chip 6502 version in the XL/XE).  I guess it follows that
such a board would also be a way to fix an 800XL in the future when the
custom chip is no longer available.

The 65816 would probably be a more ambitious upgrade, I don't know much
about how it differs.

I have not been able to locate the name of the person who was doing
65802 and 65816 upgrade designs a couple of years ago but will keep
looking...  -John Sangster