> On 2021-01-04, at 17:19, Segher Boessenkool <segher_at_kernel.crashing.org> wrote: > >> Not every detail in the design is clocked, some delays just happen because of >> gate propagation delays - and when the process changes, those delays may >> change as well. > > Yup, exactly. > >> The well known "grey dot" the new VICII produces are related >> to exactly the same thing. > > But this isn't true at all. You get the grey dot if *external* timing > is off! The difference isn't between VIC-II versions, the difference is > between boards (and what PLA or PLA replacement is used on that). Erm... are you sure? FWIW I tested a large number of combinations when developing the GreydotKilla switch for BeamRacer and a) it never happens on any NMOS VIC b) it happens on _some_ HMOS-II VICs, depending on the particular chip/batch and chip's temperature. Even on the same board. This also include boards like the "Reloaded MkII", BTW. While theoretically possible (I didn't check this) I would be a bit surprised if Jens dynamically adapted his PLA replacement timings to one or another VIC. I think gpz can comment on that. -- SD!Received on 2021-01-04 19:00:55
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