On Monday 20 February 2017, 08:19:57 Gerrit Heitsch <gerrit@laosinh.s.bawue.de> wrote: > On 02/19/2017 11:47 PM, HRSFALVI Levente wrote: > > Another addendum: Marko once measured the luma levels of different > > VIC-II chips in the same C64 motherboard, > > http://www.zimmers.net/anonftp/pub/cbm/documents/chipdata/656x-luminances. > > txt> > > . I don't know how well the data practically holds, since the > > > > measurements have been done without using a standard 75 ohm load; yet, > > one thing seems to be sure: there are slight differences between > > different VIC-II chip revisions in the luma levels they produce. Maybe > > part of what I've seen has been a result of that. I can't speak of the > > other symptoms, I didn't make measurements myself. > > We have to remember that VIC is a bit of a mixed signal chip, it is > mostly digital, but also produces analog signals. I take it as a given > that there will be slight differences between VICs of the same revision, > even if they come from the same wafer, let alone from different > production runs where the process was tweaked over time. > > So measuring luma levels only counts if you have multiple VICs of each > revision you can compare against each other. indeed, some other ppl checked the luma levels in the past decades, and its always slightly different :) -- http://www.hitmen-console.org http://magicdisk.untergrund.net http://www.pokefinder.org http://ar.pokefinder.org Wer schweigt, stimmt nicht immer zu. Er hat nur manchmal keine Lust, mit Idioten zu diskutieren. <Albert Einstein> Message was sent through the cbm-hackers mailing listReceived on 2017-02-20 08:01:37
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