Swapping Williams and Data East alphanumeric displays

Games with two 7-digit alphanumeric plus two 7-digit numeric displays can use either maker's display boards. Games with two 14-character alphanumeric displays cannot: a Williams display on a Data East CPU shows scrambled text, unless the CPU runs Williams game code.

Systems

• Data East CPU Version 1/2
• Data East CPU Version 3
• Williams System 11
• Williams System 11A
• Williams System 11B
• Williams System 11C

Related tips

• System 11 alphanumeric displays
• Run alphanumeric displays at 91 V for longer life
• Black DMD: Data East DMD controller has no clock past the 74HCT240 at U1
• System 9 versus System 11 display data
• Parts of some characters missing on alphanumeric displays
• Check every segment with the display test
• The three Data East dot matrix display sizes
• Alphanumeric displays dim or dead

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