Composite Video output from VGA signals about pico-zxspectrum

[fruit-bat]

The current code as it is outputs VGA 640x480 at 60hz. Pixels are repeated and horizontal lines are repeated. I think some extra lines that are not displayed are sent too but I would need to look through the code.

Old PAL screens wanted 50hz interlaced frames. Each interlaced frame being half the total vertical resolution of (or something like that). Maybe there are newer standards I don't know about.

To make this work I think you need to drop the frequency to 50hz and remove the line doubling... And maybe change the number of hidden lines. The sync looks complicated and I don't know how much is actually needed to get frames to lock.

http://blog.retroleum.co.uk/electronics-articles/pal-tv-timing-and-voltages/

[ArnoldUK]

Yeah, I think you are right, a bit more involved than I thought. I've given up on the idea for now as it is a huge step backwards in terms of video quality. The VGA output is superb and very stable from my obsverations.