Re: a CIA riddle - please run these tests

Am Freitag, 19. Juni 2020, 19:00:23 CEST schrieb Spiro Trikaliotis:
> Hello Groepaz,
>
> * On Fri, Jun 19, 2020 at 06:35:07PM +0200 groepaz_at_gmx.net wrote:
> > Am Freitag, 19. Juni 2020, 14:16:11 CEST schrieb peter_at_rittwage.com:
> >
> > What we are debugging there is the serial shift register and its
> > interrupt,
> > the tests puts data into the shiftregister to shift it out and then checks
> > the value of the ICR at varying amount of cycles after that. The timing
> > for the 4485 CIA seems to be shifted one cycle.
>
> Now, that is interesting.
>
> The SRQ nibbling in nibtools also uses the serial shift register of the
> 6526.
>
> There are people who have problems and say it does not work.
>
> Some of them have exchanged their 6526, and the problem vanished.
>
> Reading this, I ask myself if this problem with SRQ nibbling might be
> related. And that's most probably the motivation of Pete's question,
> too.
>
> You do not happen to have a variant of the test prog that can be run in
> a 1570, 1571 and/or 1581? ;)

That would be nice to have, indeed ... if only that wouldnt be less than
trivial to do :) BUT if those people could just check the timestamp on their
CIAs for a start, perhaps thats good enough. But sure... we should make a
"short" test, that can be ported to the drive easily - any takers? :)

at least i made a new zip with renamed files, which is hopefully a bit less
confusing: https://sourceforge.net/p/vice-emu/bugs/_discuss/thread/538e31942f/
42e7/attachment/cia-sdr-icr-tests-v2.zip

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