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Williams Pinball Controller

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The Williams Pinball Controller (WPC) is an arcade system board used for several pinball games designed by Williams and Midway (under the Bally name) between 1990 and early-1999. It is the successor to their earlier System 11 hardware (High Speed, Pin*Bot, Black Knight 2000). It was succeeded by Williams/Midway's Pinball 2000 platform, before Williams left the pinball business in October 1999. These games were released under both the Williams and Midway names.

FunHouse (designed by Pat Lawlor) was the first production game to use the WPC System, although there are prototype Dr. Dude machines that use the WPC System.

Some WPC System boards made use of the YM2151 and the YM3012 sound chips respectively. These gave the WPC a sound similar to that of a Sega Genesis, until the DCS system was introduced later.


There are six variations of the WPC hardware. The original version is sometimes referred to as WPC-89. The WPC MPU remained the same through all generation up to the addition of the security chip in WPC-S, and then the subsequent WPC-95 board. The variations are as follows:

Some Dr. Dude machines were also this WPC generation, most were Williams System 11

Terminator 2: Judgment Day was designed to have a dot matrix display from the start, but it was released after Gilligan's Island, due to T2 having a longer development time than Gilligan's Island. This generation WPC hardware was also used in some of Williams / Midway's redemption games (SlugFest!, Hot Shot Basketball, Addams Family Values)

The Addams Family was the only game produced with the Fliptronics I board, which is compatible with Fliptronics II board, which added a bridge rectifier for the flipper voltage.

Twilight Zone was designed to be the first pinball machine to use the new DCS system, but due to delays of the new hardware design it was decided to release it on the old hardware (using downsampled sound effects) instead.

Starting with World Cup Soccer, a security programmable integrated circuit {PIC} chip was added to the CPU board in all WPC-S games at location U22. This PIC chip was game specific making it so CPU boards could not be swapped between different models without changing the security PIC chip.

This generation WPC hardware was also used in the Midway redemption games Ticket Tac Toe, March 1996.

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