Moon Cresta (Galaxian)

channelmanic

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Donor 3 years: 2011-2013
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Anybody ever see a problem with the Galaxian hardware where the moving graphics are correct, but there are text characters all over the screen?

The player's ship is on top of the characters and enemies are behind.

It's all the text number "4" and is frustrating. I've ruled out the 8216s and the 2101 RAMs and have replaced a few TTL chips, but am pulling hair out over this one.

Any ideas?

Thanks!
 
Forgot... I swapped out the 2114 RAMs too. Still have all those pesky 4s covering the screen.
 
You checked the 2114s @ 3F & 3H? AFAIK, the 2101s are object RAM (i.e. sprites and missles) and the 2114s are the tilemap.

And between them and the EPROMs are the 157s @ 3K & 3J.

EDIT: sorry, was writing my reply when you posted that you already swapped the 2114s.
 
Going to go revisit the issue again this weekend on this Moon Cresta board...

I just had a bootleg Pac Man (Galaxian hardware) on the bench that was doing something similar. Turned out to be on the opposite end of the board! There was a stuck pin on IC 9B, a 74LS245.

That was an interesting one to track down.
 
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