Question about Apple ///

Adam Thornton athornton at
Fri Jul 5 13:38:56 CDT 2019

I have an Apple /// that I've had for many years; it's never worked.

When you power it up, you get a checkerboard screen, where half the squares
are solid white, and the other half have a little mosaic pattern in them.

Looks like this:

Does this failure mode ring any bells?  Obviously the video signal is being
generated well enough to sync a composite output.  Any idea whether I
should start by replacing the CPU or the ROMs?


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