These boards utilize the Motorola series of microprocessors, 2 peripheral interface adapter chips PIAs , a switch matrix, multiplexed gas plasma displays, and direct driving of lamps and solenoids no matrix. Lamps are switched on near the zero crossing times a second to prevent premature lamp filament burnout. Additional boards present in games may include various flavors of sound boards, as well as additional lamp driver boards both main and auxiliary , solenoid expander boards, specialized boards such as an echo say-it-again board, and speech boards. The software utilized in these games is very similar to one another, consisting of an "operating system" and a "game rom"; Bally utilized a masked rom for their OS over several games, enabling many roms to be ordered at one time for lower manufacturing cost. This enabled the programmers to concentrate on defining their rulesets and lamp effects instead of tweaking timing within the assembly code itself.
Williams System 6 Pinball Repair - Part 4 MPU Repair
Main article: The standard is in four volumes, which describe general requirements, fuses for industrial and commercial applications, fuses for residential applications, and fuses to protect semiconductor devices. The IEC standard unifies several national standards, thereby improving the interchangeability of fuses in international trade. All fuses of different technologies tested to meet IEC standards will have similar time-current characteristics, which simplifies design and maintenance. Additional standard ampere ratings for fuses are 1, 3, 6, 10, and UL currently has 19 "parts".
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More Williams System 3 through 7 repair information is available! Lots more pinball at Mark's Pinball Page! Introduction to Section 4: This section deals with diagnosing and repairing problems with the MPU board in early Williams solid state games System 3 through System 7. I've tried to format it such that machine owners of all skill levels can use it to diagnose their game.