CPU board 26285 versus 26285-1

Most System 3 CPU boards swap between games, with one catch. Boards up to Cue Ball Wizard (game 734) use a 2K 6116 RAM at U3 (24 pins). From Street Fighter II (game 735) the 26285-1 board has an 8K 6264 (28 pins) and revised timing. Count the U3 pins to tell them apart.

Systems

• Gottlieb System 3

Games

• Barb Wire
• Frank Thomas' Big Hurt
• Freddy: A Nightmare On Elm Street
• Gladiators
• Mario Andretti
• Rescue 911
• Shaq Attaq
• Stargate
• Street Fighter II
• Tee'd Off
• Waterworld
• Wipe Out
• World Challenge Soccer

Related tips

• Main chips on the CPU board
• CPU board connector uses
• Booting a CPU board on the bench
• Missing P6 or P7 header on the CPU board is normal
• CPU board EPROM and RAM size jumpers
• CPU board LED never lights
• Logic chips worth stocking
• U11 must be a 74HC123AN

Source: Repairing Gottlieb System 3 Electronic Pinball Games from 1989 to 1996, Clay Harrell (pinrepair.com)