Gigatron Hackers

I found the problem: PC13 and PC15 were open due to dry joints and socket U7 not seated evenly.
Re-soldering with iron set to high solved the problem.
My Gigatron now works nicely. Thanks.

Thanks. My garbled pixels have much more structure than yours! I notice something interesting: if I keep pressing the Start button, on the 2nd restart, the A sine-wave of Pac-Man ghosts appears! I can control the speed with the joy-pad and it can run for some time before the screen blanks and the Gi...

I assembled my Gigatron and powered it up. The flashing LEDs are running and the Menu appears on my monitor. :) If I select anything from the Menu which requires graphics, I get problems: Snake - brief flash of random pixels, then screen blanks, displays "no VGA signal" and stays blank. LE...