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Just finishing off an Apple-1 replica and thought I'd test it by playing a game of Lunar Lander. Chose the version written in BASIC to give the full memory a test....Hmm, something not quite right....And who is this Corgy Cojen chap?? :bigsmile:
Are you using the correct character generator? What component are you using?
Turned out to be a flaky shift register. The fault only showed up after it had been on for a while.
Might be misspelled member from here Corey986 > Corey Cohen...
sincerely
SpeedyG
Yep that would be me and I would think a shift register was the problem as they are the most likely problematic component to mess with the display in that way.
I'm curious, what are you using a shift register for?
I haven't looked over your schematics but I was under the impression that your design was similar somewhat to the Briel version.
I guess I need to study your schematics more.