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
