Space Invaders -- does not advance past wave 1

hindered

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So, today I fired up my SI with messed up sound board (no sounds at all) to play a game. Game would not boot at first. Checked +5v to the board, it was somehow draining down to 4.8 or so even though the +5 test point on the power supply was about 5.10. So, I figure my edge connector is shot and I need to replace it. In the meantime, I cranked the psu until I was getting 5.05 to the game board, which then booted fine. I played a game, and after killing the last invader on the first wave.. the game just.. continued. Never went to wave 2. An occasional UFO would still go across the top, and I could shoot it for points, but other than that, I guess I just..... won the game. :p They gave up and went home.

Anyway, does that behavior sound consistent with cranking the PSU/having a crappy edge connector? Or does it seem like something else may be going on? I put in the test rom and all RAM checked out fine.
 
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Almost sounds like a bad ram or bad rom. Never saw that one happen!

You may also want to try re-seating the daughter board again.
 
Almost sounds like a bad ram or bad rom. Never saw that one happen!

You may also want to try re-seating the daughter board again.

Yeah, I reseated the board, RAM tests fine with the test ROM, and the roms are freshly burned, and worked fine the previous night. Not saying it couldn't be the case, but...
 
Today, I reset the sound board, adjusted the PSU down and made sure the edge connector had a good connection. Game played fine (although still no sound of course).
 
Lol I keep looking because I swear someone else had the same problem, and I think they just reseated the daughterboard.

If it keeps acting up a simple thing to clean it up is to take a PINK eraser and just clean up the daughterboard side. Do not use any erasers that may be more abrasive.

As to your audio thing, I saw you found an open diode!
 
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