On 05/28/2018 09:24 PM, Francesco Messineo wrote: > On Mon, May 28, 2018 at 8:51 PM, <silverdr@wfmh.org.pl> wrote: >> >>> On 2018-05-28, at 14:28, groepaz@gmx.net wrote: >>> >> >> >> Interesting. Due to VCO? And the original clock circuit with discrete elements? There was AFAIR also a kind of PLL involved. Do those exhibit the same problem? > > the original C64 clock generator circuit (is) a regular PLL (so, not > "a kind"), the reference divider circuit is inside the VIC-II IC which > is part of the PLL. But the design of the PLL on the old C64 is a bit on the dirty side when you look at the part of the circuit containing the 74LS193. GerritReceived on 2018-05-29 18:00:02
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