[comp.sys.atari.8bit] The 6502 difference

pkopp@potpourri.UUCP (Paul Kopp) (09/16/87)

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. **
                    Mail paths?, oh yea mail paths:
                 ...!{sun,pur-ee,brl-bmd}!gould!pkopp
                 ...!{ihnp4!codas,allegra}!novavax!gould!pkopp

          Remember:  A path is just a thing that you have running
          between two shrubberies of slightly different heights.