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    Mac Plus 820-0174-A: pulsating vertical-line pattern, no bong, good sync — TSM and LAG cleared via custom PAL exerciser. Where next?

    @litriSE just wondering if you’ve made any progress on this one? I’m working on a Mac Plus logic board that doesn’t chime, just gives narrow horizontal stripes on CRT with no further activity, and I have gone down quite a similar rabbit hole as you to no avail…
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