(Topic ID: 242615)

Tech: Space invaders displays all flash 88 - why?


By EvanDickson

9 months ago



Topic Stats

  • 5 posts
  • 3 Pinsiders participating
  • Latest reply 9 months ago by EvanDickson
  • No one calls this topic a favorite

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#1 9 months ago

Hi, 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?

#2 9 months ago

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.

#3 9 months ago

I'll give that a try, thanks!

Any other things I should try? Anyone?

#4 9 months ago

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?

#5 9 months ago
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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