Re: CIA old/new?

From: groepaz_at_gmx.net
Date: Fri, 08 Jan 2021 19:51:17 +0100
Message-ID: <5521721.dfAi7KttbR_at_rakete>
Am Freitag, 8. Januar 2021, 19:44:12 CET schrieb Segher Boessenkool:
> On Fri, Jan 08, 2021 at 07:34:00PM +0100, groepaz_at_gmx.net wrote:
> > Am Freitag, 8. Januar 2021, 19:21:52 CET schrieb Segher Boessenkool:
> > > > If we exclude on-chip propagation times then there has to be something
> > > > else that "matters" because with the same external timing, still only
> > > > (some) HMOS-II chips expose the problem.
> > >
> > > I have seen no proof of that claim, btw -- of course it is hard to show
> > > supporting evidence for a negative claim, it will need a lot of
> > > independent observations.
> >
> > It can certainly be observed using a C64RMK2 board... "old" VICII never
> > shows the grey dots in it, "new" VICII will (mostly) show them, with a
> > tendency for them to disappear when the chip warms up.
>
> Ah, so you see much less than half a pixel there?  That makes sense, and
> this is what I didn't grasp.  Duh.  Sorry about that!

Well, it is very hard to see on composite how big (or small) that dot actually
is. My guess would be that it always appears slightly bigger than the output
glitch actually is,

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Received on 2021-01-08 20:03:08

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