From Newsgroup: uk.tech.broadcast

On Thu, 26 Jun 2025 15:37:35 +0100, NY <me@privacy.net> wrote:

I gather that the B&W output of the ZX81 cut a lot of corners with the timing of the signal and this meant that some TVs couldn't display ZX81 output. I think it was because there wasn't a half-line vertical spacing between the odd and even fields. This reference
<http://www.fruitcake.plus.com/Sinclair/ZX81/Chroma/ChromaInterface_PictureImprovement.htm>
doesn't mention that but does mention the lack of a back porch for
clamping of the black level - a naive omission ;-)

If there was a corner to be cut then Clive cut it, and then lopped of a
whole load more as well. Like RyanAir of his day.
Thankfully I never spent any money in his direction.
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