Running the Data East test EPROM

Steps

• Power off and swap the game EPROM at 5C for the burned 27512 test EPROM. On Laser War to Batman, rejumper for a single 27512 (J5 in, J4 out).
• Power on and watch the PIA LED (right-most of the three). It should flash up to eight times, with a long pause only after the first.
• Often it repeats a set of eight after a brief blanking LED flash; this is normal.
• When all tests pass the RY1 flipper relay clicks on and every coil and flash lamp pulses in turn (burn-in).

Systems

• Data East CPU Version 1/2
• Data East CPU Version 3
• Data East/Sega CPU Version 3b

Related tips

• Data East CPU diagnostic test EPROM
• Leon's Data East CPU test EPROM
• CPU EPROM jumpers J4 and J5
• Two PIA exceptions when using the PIA test EPROM
• Checking PIA outputs with Leon's test EPROM
• Test EPROM flash codes: which chip failed
• Free-running the CPU to check address lines
• Test program does not run at all

Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Two, Clay Harrell (pinrepair.com)