Ms pacman ghost colors

RedlandMan

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Im missing colors on My ms Pacman ghosts. I was going to start by checking the roms but as this board was hacked to play ms pacman i have more eproms than usual. Can anyone give me info on the extra chips on this board.I was considering using this board to put a multipac kit but im unsure with the way this board is set up
 

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Its hacked to play mspac without the daughterboard. Im pretty sure if you pull the original roms you can put a 96-1 on there and it will work.
Also, looks like you might have a bad color prom or 2125 ram.
 
I put on two known working color proms but still not working correctly. Any way i can tell which ram is bad
 
Check/swap out the 2125 RAM like Riptor suggested. See board or schematics for location.

If that does not solve it:
Green & red are OK because of the yellow and red of ms pac. Is the blue signal somehow diverting to the red output (short in resistor, transistor, etc)?

Measure the resistance between the color outputs (RGB) on your problem board and compare to a known good board.
 
i finally had time to work on this again. when i bend the bottom of the board towards the 2125 ram i can get the colors to leave and comeback. I guess i have some cold solder joint. Ill try and touch them up tommorow
 
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