[Coco] CoCo's TIMER and 60hz

[Dave Philipsen]

I think all *real* CoCos would nominally have the same VSYNC frequency. As far as finding a ‘test point’ on the system board to read the frequency, that would be fine but to be able to tune down to an accuracy of around +/- one second per day (which I think a good mechanical automatic wristwatches could achieve) you’d have to have a pretty accurate frequency counter that could differentiate between, say, 60 Hz and 60.0007 Hz. 

Dave

> On May 30, 2019, at 12:51 PM, Brock Harrison <brock.erific at gmail.com> wrote:
> 
> Might there perhaps exist a document illustrating the various models' VSYNC
> frequencies, if they differ, and that which can also provide some easily
> accessible locations on various motherboards so as to validate current
> machine operation against these values?
> 
> If so, the action of compiling a large list of empirical values from users
> and plotting the deviation from nominal may suggest emulation improvements
> and define soft real time clock module complexity requirements.
> 
> BH
> 
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