Generating colour bars with minimal resources

[ppppenguin]

I've now got a burst in about the right place. The vectorscope actually locked to a very brain damaged signal, even if the picture monitor obstinately stayed in monochrome. There's a scattering of vectors. Some are dots, others are like no shape I've ever seen before. I've also managed to muck up something to do with signed integers so black level and blanking are close to peak white while peak white is near black.

I may pull stumps now and run the weekly full backup.