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From: wrd@tekigm2.UUCP (Bill Dippert)
Newsgroups: net.micro.atari8
Subject: 6502 vs Atari
Message-ID: <911@tekigm2.UUCP>
Date: Tue, 19-Aug-86 03:00:00 EDT
Article-I.D.: tekigm2.911
Posted: Tue Aug 19 03:00:00 1986
Date-Received: Fri, 22-Aug-86 20:19:29 EDT
Organization: Tektronix, Inc., Beaverton, OR
Lines: 27

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.  Presumably there have been some improve-
ments but I do not think that they have gone to CMOS.  Any comments from
Atari?   Does anyone know if the 65802 chip has a halt function?  Possibly,
if it did, it could still be used with a 34/36 pin swap out.

			       --Bill--
==========================================================================
  It is rare to find anything unmodified in my household.  Half of my
  cats don't even have tails.  -- Don't flame me, they are Manx breed!
==========================================================================

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