Pinbot: Williams' U22 sound ROM download was wrong

Williams posted game and sound ROM images for these games, but its Pinbot U22 image (a sound ROM on the CPU board) was faulty; a corrected copy exists. If you burn a new U22 for Pinbot, use the corrected file.

Systems

• Williams System 11A

Games

• Pinbot

Related tips

• Inlane, outlane and drain switches all dead: blown switch transistor Q49
• F-14 Tomcat: left credit-display character scrambled
• F-14 Tomcat pop bumper locks on once a game starts
• Side targets reset after about 5 seconds: the timer is an adjustment
• How the Williams switch matrix is scanned
• Using the Williams System 11 test fixture EPROM
• Sound circuits on the 11A and 11B CPU boards
• Testing the CPU board sound section with Leon's sound EPROM

Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Two, Clay Harrell (pinrepair.com)