Strange pac-man issues (bootleg)

nmantas

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Donor 2011, 2019
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I have seven bootleg pacs that I've been getting in working order. They all function well with the namcopac roms (original puckman). The boards were made for using 12 2716's but I figured out that the row 6 rom set will work with 2532's (I can't get the row 5 roms to work with 2532's).

I have some strange issues with four of the boards while the other 3 boards work perfectly (albeit they have a long boot sequence before they get to P's, test, and grid but they function and appear perfect). The ghosts in the title screen don't disappear correctly when they are eaten, the maze color is filled instead of just outlined and its a strange babyblue (similar to the second maze of Ms Pac-man), the cherry is creamy red instead of vibrant red.

Both pcbs are running identical rom sets. The color proms at 4A and 7F are socketed and have been swapped and didn't change anything (I was thinking it would fix the cherry color).


Here is a 4 minute video going over both boards and the issues (highlighting of the issues is at 2:30 to 3:00). (Sorry for the sideways video, youtube doesn't let you rotate)

http://www.youtube.com/watch?v=Xqw4KaCUEa8


Has anyone seen anything like this and/or have any idea of what is causing it?

Thanks
 
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I will spare you the video but the exact problem happened tonight when I burned a set of Hanglyman and newpuck-X chips (both the 12 rom versions).

I don't understand any of the errors but I especially don't get how the maze could be solid-filled instead of just outlined....that seems like it would have to be specific code on the roms to produce such a difference but the roms are identical when they are on the split boards and they work fine.
 
I swapped in the roms from my Pac Gal (Ms Pac bootleg) and aux card and it was buggy as hell and eventually started to reset but the title screen and maze looked perfect. The cherries were still cream-red.

My next move is to single-rom hack it with a Ms Pac romset (bootleg) and live with the creamy cherries.
 
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