Quote from: Rabs on 13:13, 13 July 25Maybe this video may helpThat does look very similar, and I have seen mine produce the pattern in different colours occasionally, especially if the cassette deck is plugged in. It does look like a sensible thing to check.
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In this video there is a similar screen pattern, sometimes, but also the usual grey screen black border RAM problem display.
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In this GadgetUK finds that IC112 74LS32 Quad OR is faulty. Not quite sure how the floating output he finds relates to the issue as pin 11 selects the printer latch but pin 8 does select the data latch (by the way I made pin 8 float on my test board and I get the usual grey screen RAM problem symptoms).
No idea if this is the same as your problem but saw it and thought I would share.
Quote from: Dmanu78 on 16:47, 06 July 25@andycadley : I'm very curious about your test code. Don't hesitate to let me know if you notice any differences. This will help me improve the emulation.It doesn't seem to like my scan line doubling code:
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