5 Jul
2019
5 Jul
'19
11:38 a.m.
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:
https://share.icloud.com/photos/0NHNkEG9ssPsi65ojivBteKaQ
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?
Adam