Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!uunet!husc6!necntc!ames!sdcsvax!ucbvax!DOCKMASTER.ARPA!Cothrell
From: Cothrell@DOCKMASTER.ARPA
Newsgroups: comp.sys.atari.8bit
Subject: 65c802 and card
Message-ID: <870920232913.843439@DOCKMASTER.ARPA>
Date: Sun, 20-Sep-87 19:29:00 EDT
Article-I.D.: DOCKMAST.870920232913.843439
Posted: Sun Sep 20 19:29:00 1987
Date-Received: Tue, 22-Sep-87 02:06:26 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 7

Contrary to popular belief...the 65C802 is not 100% compatible with the
6502.  I discovered this in building the processor replacement card..
the 65c802 cannot have its cycle extended by "stretching" the Phase 0
clock at a logical 0.  the spec sheet specifies a "maximum T0-low" for
the phase 0; the max time for my chip (4Mhz version) is 10 us.  the 6502
max low time is infinity.  the 65C802 max high time is infinity, but the
6502 has a non-infinite max high time.  Back to the drawing board.