hook display problem

HAVASUGAMEMAN

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Nov 11, 2002
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lake havasu city, Arizona
ok so i think i have narrowed it down to a problem on the cpu board.display works great when i put it into batman with the hook prom in it,so it is not the prom on back of display or display itself.so looking at the schematic i see chip 6821 controls alphanumeric pia,is there something else i should be looking at? what does the digit strobe or the diplay strobe do?
 
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