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From: Cothrell@DOCKMASTER.ARPA
Newsgroups: comp.sys.atari.8bit
Subject: 1200xl portb
Message-ID: <870906220141.431649@DOCKMASTER.ARPA>
Date: Sun, 6-Sep-87 18:01:00 EDT
Article-I.D.: DOCKMAST.870906220141.431649
Posted: Sun Sep  6 18:01:00 1987
Date-Received: Sun, 6-Sep-87 22:43:34 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 11

I would like to know what the pinout of the 1200xl's port b is.  also,
which pin on the 6520 corresponds to bit 0 (I assume the rest are meerly
increments of bin and bit).  Also, there have been some rumors on
occasion that the CPU in the Atari 8 bitters is a custom CPU with a 6502
instruction set.  Is this true?  If so, what changes were made?  I have
a 65C802 CPU (16 bit, 6502 pin compatible) that I would like to drop
into my 1200 or 130XE.  A friend has done this with a Vic-20 (no laughs
please) and had no problems...except his games sped up.  Comments and
suggestions are welcome.

Cothrell -at dockmeer)