JHSangster@DOCKMASTER.NCSC.MIL (03/10/90)
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 SangsterOrdania-DM@cup.portal.com (Charles K Hughes) (03/14/90)
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