Re: C65 on Ebay

Den Sat, 4 Nov 2017 14:11:30 +0000 skrev smf <smf@null.net>:
> On 04/11/2017 13:31, Mia Magnusson wrote:
> 
> > But there is some slight difference in the crystal frequency afaik,
> > maybe that also affects the RF modulator. Most TV's are rather
> > tolerant because the sync frequencyes from a VCR's can vary quite a
> > bit if the tape for some reason (temporary) runs too slow or too
> > fast.
> 
> There are built in tollerances because it would have been impossible
> to build clocks into the broadcast equipment and a receiver that
> operated at exactly the same speed no matter the temperature.
> 
> I believe you are correct and a "PAL" amiga running at 60hz has a 
> slightly different timing to an "NTSC" amiga running at 60hz. This is 
> pretty common on any system that uses the colour clock for timing,
> the only system I recall that copes properly is the Net Yaroze Sony 
> PlayStation as it is fitted with two colour clocks & it selects the 
> correct one for 50hz or 60hz.

But the Amiga doesn't use the color clock for timing - atleast not on
any other Amiga than A1000. (However there is a correlation, but not
that strong)

Maybe I'll have to dig out the schematics for PAL and NTSC A520 :)

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