The auxiliary power driver board has the AC relay, which finally centralized the location of it. It also allowed circuits with different voltages to share the same power source by using current limiting resistors to drop voltages to the appropriate levels. The interconnect boards acted as a pass-through for switch, lamp, flasher, and solenoid signal lines and circuits. ![]() Game-specific interconnect boards and auxiliary power driver boards were introduced in System 11B games. ![]() ![]() Later in the System 11 series, sound functions were partially (11B) or fully removed (11C) from the MPU, and eventually were solely handled by a dedicated sound board. Starting with the 11a board set, a more complex sound board was added (System 11 sound boards are strictly background sounds only). The power supply, sound board, and CPU driver board have minor changes. ![]() The primary differences between the System 9 and System 11 board sets are the sound system and rom space. Its far easier to just modify the rom images so that they are plug and play when installed in a System 11 CPU. With a fair amount of effort, a System 11 board could be made compatible with a System 9, but it is not worth the extended effort to change the jumpers.
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