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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?

    Mac Plus 820-0174-A: pulsating vertical-line pattern, no bong, good sync — TSM and LAG cleared via custom PAL exerciser. Where next? Hi all — long post, but I think it's worth the detail since I haven't found anyone documenting quite this deep on this specific symptom. Looking for ideas on where...
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    Running a Mac Plus logic board on an SE analog board/PSU — anyone done this?

    I'm looking at running a Macintosh Plus logic board off a Macintosh SE's analog board, CRT, and PSU, instead of the Plus's own analog board. I've cross-referenced and mapped the power and video pins between the two harness connectors. What I want to understand is the Plus's output video signal...
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    Macintosh SE Checkerboard pattern with random speckled dashes, no boot chime

    I have a Macintosh SE 820-0176-B, 1986, 630-4125 logic board that shows a checkerboard pattern with random noise/static (speckled dashes) displayed on boot, with no audio boot chime — just a single speaker click. I've installed the suspect board into a known-good SE chassis (proven analog board...
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