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Hackcell

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Does anybody know if it's possible to recreate/replace the PAL in a ZN2 B board?

I have this Rival Schools B board that had 2 EPROMs damaged and only displayed a color partern. After replacing the faulty EPROMs, I get a CanNotFrinProgramRom. All EPROMs are OK (even the mask and I've tried reburning the Country PROM even in a new EPROM. So, my only guess (unless somebody else has experienced the same and know what's going on), it may be the CAT702 PAL is damaged.
 

Hackcell

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Didn't work. Same B930 error. Isn't it the CPS B custom the same found in CPS-2 boards?
 

Hammy

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Swap the romboard with a known good before going any further.
Otherwise the bios board is recommended to bypass the CAT chip.
 
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