DaveyPocket
Member
Space Invaders Deluxe, jittering screen fixed, now there's a new problem....
So if any of you had no idea what was happening here:
http://forums.arcade-museum.com/showthread.php?t=140362
I found the problem: Someone had swapped the crystal oscillators on this Space Invaders board, the oscillator was at the wrong frequency, causing the game to screw up. I installed the oscillator from my working board into that one, and the problem went away (I still had the ROM's removed). I got the horizontal bars.
After installing the game ROM's, the game powered up with garbage all over the place, except this time, it was stable. Also, when I take out ROM H and let it do the horizontal line thing, the horizontal lines have jittery pixels at the top of them.
Here's what I can tell you so far:
- Power supply is functioning properly
- No problems on reset line (It works fine)
- Sound board works
- CPU works
- Monitor works
Anyone know what the issue could be?
So if any of you had no idea what was happening here:
http://forums.arcade-museum.com/showthread.php?t=140362
I found the problem: Someone had swapped the crystal oscillators on this Space Invaders board, the oscillator was at the wrong frequency, causing the game to screw up. I installed the oscillator from my working board into that one, and the problem went away (I still had the ROM's removed). I got the horizontal bars.
After installing the game ROM's, the game powered up with garbage all over the place, except this time, it was stable. Also, when I take out ROM H and let it do the horizontal line thing, the horizontal lines have jittery pixels at the top of them.
Here's what I can tell you so far:
- Power supply is functioning properly
- No problems on reset line (It works fine)
- Sound board works
- CPU works
- Monitor works
Anyone know what the issue could be?
