Little Ms.PacMan problem

Powerplayfec

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I got a strange problem with a Ms.Pac board. Everything is looking and working fine except that 2 of the Ghosts are pink and the other 2 are red. All 4 have no eyeball irises. Character ROMS are AOK. Any pointers on where to look for a problem? Thanks.
 
Not to impede on someone's thread, but I have a similar problem with a Jr. Pac field board. Are the color roms in the same location or does anybody know the location?
 
For the OP, it could be the color proms but it sounds like a problem with the 2125 ram(s).
Jrpac also has a couple proms and I think the rams on that board are a couple 93422.
 
I am pretty sure PacJR boards are just like Pac Man boards........
Anyway.......... my color proms check AOK. Sure is wierd... Got 2 Red Ghosts and 2 almost White ghosts.?
 
I got a strange problem with a Ms.Pac board. Everything is looking and working fine except that 2 of the Ghosts are pink and the other 2 are red. All 4 have no eyeball irises. Character ROMS are AOK. Any pointers on where to look for a problem? Thanks.

I had a board with this exact problem but I do not remember what was wrong with it. I think it may have been one of the motion object RAM chips. Without looking at a PCB I think they are in row 1 in the lower right hand corner of the board. They are the ones with the little heat sinks on them.
 
I fixed a similar issue a couple weeks back, it was a 74LS174 at location 1H. That bit of TTL selects the proper graphics to display.

Please post a follow-up to this thread for archive purposes.
 
I am pretty sure PacJR boards are just like Pac Man boards........
Anyway.......... my color proms check AOK. Sure is wierd... Got 2 Red Ghosts and 2 almost White ghosts.?


Not the same hardware, boards are different.
How are you checking the proms, reading them or just physically looking at them. On pac boards it is not uncommon to find pac plus proms on them which makes the colors screwy. On a pac if some colors or details are missing on the ghosts and/or pac only you need to look at the 2125's and any associated IC's in that area (like Mike just said).

This thread is confusing now, talking about two different boards.
On Jr pac you should check out the two 7489 rams at the bottom of the board.
 
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Im sorry, should have been more specific. The 2125's are the rams with heatsinks on them in row 2 A-D. The actual ram on your board could have a different part number like 93425 or 93415.
 
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