800XL UPGRADES

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1 total messages Started by Ishler.WBST Fri, 31 Jan 1986 20:49

#2331

Author: Ishler.WBST
Date: Fri, 31 Jan 1986 20:49

11 lines
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		I have been following the discussion on upgrading the 800XL with the
65816 processor.The main problem that I see is that ATARI didn't use a
standard 6502 in the 800XL it's a special version made for them that has
some of the pinouts changed and new signals added to the chip.This chip
is code named "SALLY" and in the 800XL repair manual is says "6502c
(modified)"pg 1-5.In particular the r/w pin is 36 and a new input
is"HALT" at pin 35.All of the 65xx family manuals that I have, don't
contain a chip like this.
		
		Mike

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