PC2JAMMA
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2 Player, 3 Button Version Using just the Keyboard
This is the setup I use

Components
17 x 1K Resistors
3 x 7404 (Hex Inverters)
5 x 4066 (Quad Bilateral Switches)
8 x 14pin DIL Sockets
 
  The complete circuit diagram looks like this
(Click for a more legible version)

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