HAVASUGAMEMAN
Member
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?