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From: pkopp@potpourri.UUCP (Paul Kopp)
Newsgroups: comp.sys.atari.8bit
Subject: The 6502 difference
Message-ID: <607@potpourri.UUCP>
Date: Wed, 16-Sep-87 12:01:01 EDT
Article-I.D.: potpourr.607
Posted: Wed Sep 16 12:01:01 1987
Date-Received: Sat, 19-Sep-87 12:14:02 EDT
Organization: Gould CSD, Fort Lauderdale, FL
Lines: 30
Keywords: I see no keywords here!


This was posted on the net a while back.  I saved this because I knew I
would need it someday.

------------------------------
Apparently the so called "6502" used in the Atari's is a custom modified
chip, hence its not using the industry type JDEC number.  From Mike at Xerox
comes the following:

     Atari 6502c #C014806                   standard 6502

     pin no.    function                    pin no.     function
     36         READ/WRITE                  36          N.C.
     35         /HALT                       35          N.C.
     34         N.C.                        34          READ/WRITE

Therefore one could bend up pins 34 and 36 and do a wire connection to swap
these two pins, but that would still leave you without a /HALT command.
(Presumably the halt command is necessary.)  I do not know if the 6502c
chip used by Atari is identical between the original 400/800, the intermediate
XL series and the current XE series.

        Gould Inc., Computer Systems Division, in Sunny South Florida
              ** The opinions (if any) expressed are my own. **
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