Space Invaders
Bally, 1980Hi, I've been asked for help by someone who has a Space Invaders. Apparently it boots and plays ok, lights and sounds all work. But all 4 displays are flashing 88. I've never encountered anything like this, and my google-fu is not finding an answer. Anyone got an idea what the trouble might be?
My first suspect would be connectors. On MPU and each display.
Then disconnect all displays and reconnect one at a time to see if any test bad.
If it's happening on all 4 displays I doubt its bad connectors on all of them.I would guess the 4th bcd line is stuck which would give you an 8.
Try swapping U10 and 11 on the MPU. Also check the bookeeping. If the numbers are scrambled could be a bad 5101 or 6810 chip.
Also whats the deal with the battery on the MPU?
Quoted from BigAl56:If it's happening on all 4 displays I doubt its bad connectors on all of them.I would guess the 4th bcd line is stuck which would give you an 8.
Try swapping U10 and 11 on the MPU. Also check the bookeeping. If the numbers are scrambled could be a bad 5101 or 6810 chip.
Also whats the deal with the battery on the MPU?
It's supposed to be restored, but I haven't seen it in person yet.
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