Am Sonntag, 10. Januar 2021, 22:39:18 CET schrieb Francesco Messineo: > On Sun, Jan 10, 2021 at 10:32 PM <groepaz_at_gmx.net> wrote: > > Am Sonntag, 10. Januar 2021, 22:19:44 CET schrieb Francesco Messineo: > > > On Sun, Jan 10, 2021 at 10:08 PM <groepaz_at_gmx.net> wrote: > > > > Am Sonntag, 10. Januar 2021, 22:00:53 CET schrieb Francesco Messineo: > > > > > On Sun, Jan 10, 2021 at 9:58 PM Gerrit Heitsch > > > > > > > > > > <gerrit_at_laosinh.s.bawue.de> wrote: > > > > > > (*) I think only the 8500/6510 pair cannot be told apart via > > > > > > software. > > > > > > > > > > I have had success with this but I still need to make some other > > > > > tests > > > > > to have a reliable routine. > > > > > I only have 2 x 8500 at home, so my sample size is very limited. > > > > > > > > testing the bit fade time of the CPU port? > > > > > > of course, I can't think about any other way. > > > > > > This is a reliable indicator of die temperature, since gate leakage is > > > function of the die temperature. It's very different between > > > NMOS and HMOS-II. However I've found some broken 6510 that couldn't be > > > tested (the "1" level fades before it can even be read > > > back). > > > > It's not reliable for telling them apart from my experience... you get a > > quite high success rate, but still not 100% > > my 8500 when very well warm are still slower than a very cold 6510, so > my limited sample size is 100% reliable. > However, I've also found the 6510 of some friends to give a bit too > broad results. > Of course the loop must run with VIC-II blanked and interrupts disabled. > I have another idea about a test but I've never had the time to write > some code for it. It would *maybe* work if the input gates > of the bits 6 and 7 are very close in the die. I tried it on ~10 C64s and two C128s... it would randomly give false results. The same is true for the bitfading on SID registers... you surely get a "typical" value most of the time - but not always. I wouldnt rely on it :) -- http://hitmen.eu http://ar.pokefinder.org http://vice-emu.sourceforge.net http://magicdisk.untergrund.net Die Furcht vor der freimütigen Antwort kann auch robuste Charaktere befallen. <Jeanette Schmid>Received on 2021-01-10 23:01:31
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