On 5/19/2016 8:41 AM, Adrian Graham wrote:
Then I remembered that I've composite modded a Sinclair Spectrum and a ZX81
and I get no picture at all with those, like the signal is too weak for the
monitor to pick up. Said pair of machines work fine on my 2008-era LCD TV
though so does anyone know what the difference might be?

Just because I could I hooked the Spectrum up to an Apple ][ Monitor and
that works fine - http://binarydinosaurs.co.uk/IMG_8839.JPG

Are there variations to the PAL Composite standard?

I think that the problem is probably that the Spectrum and ZX81 didn't actually comply with the standard so much as use it as a general guideline.

Analogue monitors could cope, but many LCDs cant.

Doug




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