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From: Ordania-DM@cup.portal.com (Charles K Hughes)
Newsgroups: comp.sys.atari.8bit
Subject: Re: INFO-ATARI8 Digest V90 #30
Message-ID: <27862@cup.portal.com>
Date: 13 Mar 90 22:06:46 GMT
References: <900310044119.739566@DOCKMASTER.NCSC.MIL>
Organization: The Portal System (TM)
Lines: 33

RE: 65802/816 upgrade.

John Sangster writes:
---------------------
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
------------------------

  Guess what...that is exactly what I am trying to do.  It should be that 
simple but it didn't work the first time.  I am still working on it.
  For those of you out there that are looking for schematics, try your
local library.  Mine has most of the SAMs series and that is where I go.

  Btw...the other guy who was working on the 816 upgrade is called Chuck
Steinman.  He isn't particularly helpful to non-816 owners, but then he
doesn't have any competition...YET! ];>

Charles_K_Hughes
@cup.portal.com