> On 2021-01-08, at 19:44, Segher Boessenkool <segher_at_kernel.crashing.org> wrote: > > 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? It's hard to tell. Didn't look at it this way when doing all the tests. The impression was that they are either there (looked to me like a full pixel but can be wrong on that) or they are not. Some of the chips that do have them can show them less often with the temperature rising. Up to a point when they are no longer appearing at all. The temperature response varies substantially from chip to chip (all HMOS-II). I am tempted to connect the stuff and do a hi-resolution grab of the output so that we can hopefully be sure if the size of the sparkles also varies. -- SD!Received on 2021-01-08 22:00:57
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