Spacel Duel - moving objects "jump"

luxmatic

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I'll guess a boardset issue with SD as Gravitar is fine on the same monitor. I would think that if it were a monitor issue, the problem would be universal from game to game.
 
I would bet boardset problem. If your lucky maybe a recap of the pcb. If not, I think a space duel pcb can be had for $75.

If you want to try another pcb, I have a spare..

One thing that does look of is the adjustments on the SD board, if you put it in test you will see that the corners are not lined up. the 2 pots glued down (past the 2 rows of 3) need to be adjusted..
 
It looks like a stuck bit somewhere. There are some shift registers you could probe the output pins of. I'd look at the 74194 chips on row 8.

I'm curious what the 'growing boxes' look like on the test screen.
 
It looks like a stuck bit somewhere. There are some shift registers you could probe the output pins of. I'd look at the 74194 chips on row 8.

I'm curious what the 'growing boxes' look like on the test screen.

I'm lacking a wiring harness still, so no way to advance through the test screens. Will post back when that gets sorted out.

Some sort of shift/roll error - that's kind of what it feels like. Do you have a pointer to a website that describes how I'd do this? Would be good to learn how to do.
 
I would bet boardset problem. If your lucky maybe a recap of the pcb. If not, I think a space duel pcb can be had for $75.

If you want to try another pcb, I have a spare..

One thing that does look of is the adjustments on the SD board, if you put it in test you will see that the corners are not lined up. the 2 pots glued down (past the 2 rows of 3) need to be adjusted..

Those are the *bip pots, right? I adjusted the best I could without help. I'm waiting for a wiring harness for the Space Duel cp I have, and can't easily step through the tests.

Are you in the south bay? IIRC, you came by my townhouse to check out this very same Gravitar 16 years ago. Gave me lots of advice! I'm in Oakland now. Would love to find a way to try your SD board out.
 
I forget but I think when you put space duel into test, all you have to do is hit player 1 and player 2 start at the same time. then the slam switch changes between tests.

Maybe the gravitar starts are not wired to the same spot it will not work..
 
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