Version "3b" CPU boards have extra printer pins at CN3

From Last Action Hero to Batman Forever the version 3 CPU board carries three extra pins on connector CN3 for an optional printer. Otherwise it is the same as version 3.

Systems

• Data East/Sega CPU Version 3b

Related tips

• Full CPU jumper settings by board version
• Other CPU jumpers and what they set
• Bench-testing a CPU board on +5 V
• Missing VMA signal from corroded traces
• CPU EPROM jumpers J4 and J5
• Where the TIP122 drivers are on the CPU board
• CPU board PIA positions and jobs
• CPU jumpers J4 and J5 set the EPROM size at 5C

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