Re: CIA old/new?

From: Segher Boessenkool <*segher_at_kernel.crashing.org*> Date: Fri, 8 Jan 2021 12:44:12 -0600 Message-ID: <20210108184412.GO30983_at_gate.crashing.org> · segher_at_kernel.crashing.org

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!

Segher