Quote:
I owned also a ZX-81 (24 years ago). As far as I remember, TV image was controlled by the Z80A microprocessor, not by an specialized chip. It's possible that syncro signals will be OK for a TV-set but unstable for other purposes. Try to get a time base corrector (TBC). Some high-end VCR has TBC and also exists as PCI cards.
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I believe you are on to it. The screen shot of that
VirtualDub histogram on the web page in my first post would indicate that the output signal is not like any normal NTSC signal.
The
Datavideo TBC-100 Time Base Corrector is a PCI card that could do the trick. I wonder if it could handle something as wierd as the ZX-81 signal.