Re: Zx81
Well done, not bad at all for someone who keeps saying he doesn't know how to solder. Quite difficult to work in that confined space as well.
It would appear, then, that the real problem may have been a faulty modulator (possibly intermittent, as you did manage to get it to look better occasionally by putting pressure on it). That presumably doesn't matter if you plan to keep it modified this way.
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