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

From: Nicolas Welte (
Date: 2002-02-28 10:38:19

Richard Atkinson wrote:
> > > set DDR as output
> > > set DR as one
> > > set DDR as input
> > > wait until DR is zero
> Well, I think Nicolas Welte and various others had some significant input
> into the technique too...

Yes, thanks for remembering that. Originally I wanted to use the method to
distinguish 6510 and 85xx CPUs (the time differs between them), but then you
found that the value depends a lot on the temperature as well, even more than
on the CPU type.

I wondering what A.K.'s part is in the story, he jumps into every discussion
that is about CPUs and shares his "secret knowledge", as if it would be the
biggest achievement in CBM history ever. Rather annoying ...


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