xcelite
New member
ok intresting problem here i have a c&d pcb that showed up on my bench it had 4 problems lines in screen random sprite flickers and some sprites jump. I found 6 bad bit ram 4116's by using the self test mode. After those were replaced the self test says all is good. now here is the crazy part i still have jumping sprites in attract mode and play mode. If i run test mode after the game is running test mode is good. if i boot the board with test mode engaged then i get ramdom bit map errors. so i hooked the fluke up and it reads the bit map ram fine. Any idea's