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From: wrd@tekigm2.UUCP (Bill Dippert)
Newsgroups: net.micro.atari8
Subject: 65C02
Message-ID: <894@tekigm2.UUCP>
Date: Wed, 13-Aug-86 13:09:37 EDT
Article-I.D.: tekigm2.894
Posted: Wed Aug 13 13:09:37 1986
Date-Received: Thu, 14-Aug-86 22:02:12 EDT
Organization: Tektronix, Inc., Beaverton, OR
Lines: 21

Does anyone know much about the 65C02 chip?  I understand from an article
in either Antic or ANALOG that it was pin compatible with the 6502 chip.
Hence I obtained one and swapped it with my 6502 chip in a 1200XL.  Voila,
instead of getting a normal screen, I got an all green screen and nothing
happened.  This was with no cartridge inserted.  With a cartridge inserted
I could not get anything on the screen.  (Altho between tests, I had swapped
the 6502 in and out again to check the computer.)  Finally I gave up and
put the 6502 back in again.  Computer worked fine.  Only thing that I 
noticed was that the chip said that it was a R65C02.  I thought initially
that the R indicated the vendor, but I am wondering -- is there such a
thing as a "reverse chip" -- in other words is what I have a 65C02 chip
with pins reversed (or backwards)?  Has anyone had any success in swapping
in 65C02 chips?  Or is the Atari 6502 a custom modified 6502?  I do notice
that the Atari chip has their part number on it and not the JDEC 6502 
designation.  (Did not Commodore originate the 6502 and if so, is Atari
merely trying to hide the origin?)

				 --Bill--
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Just hacking away at my hardware, a little saw cut here, a new chip there!!
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