Re: 6522 vs 6526 (was Re: 6502 to 8501: new details)

From: Marko Mäkelä (Marko.Makela_at_HUT.FI)
Date: 2002-02-26 08:01:39

Miika Seppänen's message bounced:

[quoted messages about CMOS vs. NMOS removed]

Several years ago I bought one for my VIC-20 to replace its broken 6522. 
It works (or should I say "worked", since the VIC is dead now. Maybe the 
CPU this time :( ) fine, so does it really matter if the chips are NMOS 
or CMOS?


Yes, it does matter when it comes to less basic features.  The
instruction set of the CMOS 6502 processors differ from the NMOS 6502
ones, and also the behaviour of documented instructions differs.

I don't know what differences there are in the logical behaviour of
the NMOS 6522 and the CMOS 6522, but I'd be surprised if there weren't
any.  There may also be electrical differences.


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