Wrong Colors on Bootleg MS Pac

madrits

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I have a MS Pac bootleg that is displaying the wrong colors. Basically 4 colors are swapped. Blue with Green and Yellow with Pink. I used the two bits diag board to display the color grid.

I have been told by the guy selling these that hacking the board and running a couple of wires to different locations fixes the colors. But the tech that did this for him originally cannot be reached.

The board uses the same color proms as the original midway boards at 4A and 7F. As a matter of fact most of the color section is identical to the original. There are just a few minor differences. One of which is obviously swapping the colors.

Has anyone seen this board and/or problem before? Any ideas on what I can do to swap the colors? At the very least to swap Blue and Green?

Thanks in advance.
 

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I have a MS Pac bootleg that is displaying the wrong colors. Basically 4 colors are swapped. Blue with Green and Yellow with Pink. I used the two bits diag board to display the color grid.

I have been told by the guy selling these that hacking the board and running a couple of wires to different locations fixes the colors. But the tech that did this for him originally cannot be reached.

The board uses the same color proms as the original midway boards at 4A and 7F. As a matter of fact most of the color section is identical to the original. There are just a few minor differences. One of which is obviously swapping the colors.

Has anyone seen this board and/or problem before? Any ideas on what I can do to swap the colors? At the very least to swap Blue and Green?

Thanks in advance.

Yeah, it'd be easy. Look at the harness, find where the blue and green signals for the monitor are coming from. Cut the traces for blue and green, and run 2 wires from green->blue and blue->green.
 
Wow, talk about brain fart. That should have been the first thing I tried. Instead I'm sitting here trying to change inputs and outputs. Thanks Scucci. That will definitely do it...
 
Ummm, I think I have a couple here I already modded. There are some poorly made boot pcbs that have two colors swapped. I have run across this 4 times. Also be aware that alot of the pac jamma boots dont have the video ground trace connected so you need to jump that too.
Stand by and I will get you a pic of the mod, its very simple.
 
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Thanks a lot. That's exactly what I did once Scucci kick started my brain. Great catch on the video ground. I didn't notice that... Thank you both...

-Slava
 
So did you get it fixed?
Just curious if it had both issues on that board. There are a bunch of different revisions of those jamma mspac boards. I think I have three different ones at the house now. Its amazing how many different bootleg pac boards have been produced over the years.
 
Another "issue" with these chinese boards is the silkscreening is often wrong on the socket orientation. The socket notch is installed the correct way but the screening will show it on the opposite side. Apparently this confuses some people because I have gotten several boards with eproms plugged in backwards. Its usually the character rom because it sits sideways instead of up and down.
 
I think the board in this post is a Korean made board,not Chinese.
The similar board ,same size ,has more chips on sockets ,sometimes has Zloa MsPacman chips on them,that is Chinese board.The Zloa MsPacman board doesn't have color mix up issue.
I come across many different aftermarket MsPacman boards,some were 18,22,28 pins,Towbits made a double connector MsPacman board,has both 22 pins for original and 28 pins for jamma.
 
Sorry for the delay, I was out of town. It did in fact fix it. Thanks again.

So did you get it fixed?
Just curious if it had both issues on that board. There are a bunch of different revisions of those jamma mspac boards. I think I have three different ones at the house now. Its amazing how many different bootleg pac boards have been produced over the years.
 
These boards are great, you can run the Pac 4-in-1 on them with just a couple of wires (and a direct swap of the ram for nvram for high score save).
 
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