Re: Innovative Amiga genlocking

Den Tue, 7 Nov 2017 09:55:26 +0100 skrev silverdr@wfmh.org.pl:
> 
> > On 2017-11-07, at 09:46, Mia Magnusson <mia@plea.se> wrote:
> > 
> >> That's exactly what I understand Mia wrote and I rephrased:
> >> "Meaning you have to slow down or speed up the Amiga clock and
> >> wait for the syncs to align their phases. This takes time. Not
> >> much but still. Then you need to constantly monitor the two for
> >> drifting and react accordingly by either speeding up or slowing
> >> down - basically a form of PLL."
> > 
> > Really old tellys, like from the time where active components were
> > expensive (valves/tubes and the early transistor TV's) almost did
> > that. But it usually took far less than a second. Although there
> > were no pixel clock, they slowly synced up their local oscillators
> > for hsynk and vsynk and you could se the picture roll around for a
> > short moment.
> > 
> >> If that's how it actually works then I stand corrected. I (and as I
> >> understood smf too) thought it was done by supplying the reference
> >> pulses to Amiga so that it "knows" when to start the line/field. I
> >> thought that was the purpose of having the possibility of sync pins
> >> to act as inputs.
> > 
> > I thought so too before I got hold of an actual genlock. :)
> 
> So you _did_ check it, right? Well.. then I stand corrected, indeed.

It was a long time ago, but IIRC I didn't need any software to flip
those bits to input.

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