Re: C65 on Ebay

Den Sun, 5 Nov 2017 20:57:42 +0000 skrev smf <smf@null.net>:
> 
> On 05/11/2017 19:23, silverdr@wfmh.org.pl wrote:
> > Theoretically looks like you could probably do this (and then 
> > constantly monitor for drifting and react), but the questions are:
> > 1) why make it more difficult and expensive while at the same time
> > potentially less reliable and slower to lock?
> >
> It is essentially what I described a while back for making c64 output
> a valid pal/ntsc signal while maintaining perfect sync between the
> cpu/sid & vic, by speeding up/slowing down the system clock to make
> the sync pulses hit at the correct time.
> 
> I wasn't considering syncing to an external sync, which would add
> some complexity. But it would be an awesome project.

If you want a signal that has correct interlace you cannot do this
without breaking sampled audio playback, as you have to halt the VIC
chip for one line to insert the interlace line. The only way to avoid
this is to have a buffer for video signal that can hold up to one line,
and run the VIC so the v-sync is perfectly aligned but H-sync slightly
off so it will drift exactly one line until that extra blank line is
needed...

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