Atari 4-Player Football Play-Select Wiring Diagram

bit_slicer

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Not sure if this would benefit anyone, but while making the test wiring harness I drew up the diagram for the two 'Play Select' LED boards. How it works is that the LED array is time-multiplexed among Anodes B,C, and D, and the CPU lights up the correct LED for each. It does this so fast that the human eye filters out the LED 'off' time and it looks like the selected LEDs stay 'on'.

http://bitslicer.tripod.com/index.htm
 
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