The ZX Spectrum Reverse Engineering and Clone Desgin Blog


A site dedicated to the reverse engineering of the ZX Spectrum and related projects.

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Video Noise Resolved

May 7, 2007

The video noise referred to in the Pretty Pictures page simply turned out to be interference picked up by my scart cable switching box.

I took the Harlequin prototype around to various members of my family to try it on their TVs, and they all gave great results with no noise at all. The common factor with those tests was that I was plugging directly into the TV. I tried plugging directly into my TV, and the interference was gone!

I suspect the scart swithing box is introducing a ground loop in the RGB video line. I'll have to look into that. However, feeling pleased.