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

From: Richard Atkinson (
Date: 2002-02-25 17:36:42

On Mon, 25 Feb 2002, Ethan Dicks wrote:

> > I just had a quick look at the design, because I once thought about making my
> > own, but to save parts (one inverter) I would've used a 6526.
> 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?

OTOH with the 6526 you're sure of getting one of Commodore's NMOS
processes, whereas with the others you don't know what you're getting.
Possibly even CMOS in some cases!

> While I'm on the subject of 40-pin 6502-family ICs, while fixing up amn AIM-65
> this weekend and going through my bins of parts, I ran across both 6522 chips
> and 6522A chips.  Are there any substantial differences?  Current drive on
> the output ports?  Anything?

2MHz compatibility would be my guess.


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