MdntTrain wrote:
> On Nov 9, 9:24 am, Drew  wrote:

> < monitor
> tries to also sync is a little annoying, when booting my GS i never
> see the Apple IIGS bit, just GS/OS loading.>>
> 
> Yeah, I find that annoying too..  I wondered if it's doing that in
> response to the changing dot clocks coming the IIgs as video modes are
> switched.. but as its dot sync to the 16mhz super hires mode is
> imperfect, I'm actually not sure what it's doing.   It could just be
> that the V+H syncs coming from the IIgs are interrupted during mode
> changes, thus simply requiring the converter to relock onto the
> 15.7khz signal.

As you noted, the change in dot clock is a likely cause.  When the IIgs
switches to 16MHz (SHR) mode, the lock circuitry that was happy with
14.3MHz becomes unsatisfied, and so disables video and starts to hunt
for a new lock.  When it fails to do so, it settles on some sampling
frequency and re-enables video conversion.

-michael

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