Konami Aliens arcade pcb repair #2
Game had bad graphics on the intro and missing title screen. Mask ROM test indicated rom J13 was bad – and it was. A 27c400 eprom was used as a replacement (if I remember right that’s actually twice as big as is needed, but I didn’t have any others spare. Instead I used the trick of writing the same data to upper and lower halves of the ROM so it was correct regardless of the state of the top address line).