Arkanoid Revenge of Doh - graphics issue

arcaderob

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Hi,

I have an Arkanoid Revenge of Doh Graphics issue.

I have an Arkanoid Revenge of Doh PCB that has graphics banding issues. The test screen shows RAM and ROM OK. Game plays fine.
I Have:

Checked for correct +5v
Reseated all socketed chips
Verified the ROMS at positions B08-11 and B08-12. I do not have an eprom programmer that can read the other ROMS.

Does anyone have the schematics, or any idea where to start trouble shooting?

Thanks
Robert
 

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I did a bunch of work on Arkanoid, not DOH.

From the pics, I'd guess a bad '194 shifter, but since Arkanoid used custom shifter ASICs, I assume this does as well, and the functionality is in one of those SETA chips.

Could just be a bad 6116, but I'd expect self-test to find that.
 
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