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

From: Nicolas Welte (
Date: 2002-02-25 18:00:02

On Mon, 25 Feb 2002, Ethan Dicks wrote:
> Since the 6522 was made by multiple vendors (Rockwell, MOS, Synertek, UMC...),
> I would think that it's a "safer" chip to use.  The 6526, while millions
> were made, was strictly a Commodore/MOS product, right?

Right. But actually both chips are overkill, they have many more
capabilities than just a single I/O port. A chip like the 6529 would
better suit the needs, but it has the big disadvantage of not having a
data direction register. I think both the 6526 and 6522 are good enough
for testing the concept of the adaptor during prototyping.


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