Namco DigDug PCB color Problem

[olum64]

color problem
hello maybe someone can help me have a problem with dig dug and the colors have set pictures
where should I start is the problem on the video board custom chips pins are clean and look good

 

[stj]

check the chips at 5A-5D, i think they are 4k roms

 

[olum64]

hello there are no roms?

 

[stj]

damn,
thats a Namco board - i thought you had the Atari one.
i'll have to try and find the other schematics

 

[stj]

look for roms at 7A/B, 7C, 8A/B, and 8C

 

[olum64]

hello all roms read out and compared all well

 

[olum64]

hello error was a coler prom DDI-4

I built an adapter and am waiting for the WINBOND W27C512

 

[stj]

that was what i wanted you to test, but i didnt know the part number - the schematics are shit and only have the atari/namco number!
256x4? is it tri-state or open-collector?