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http://en.wikibooks.org/wiki/Serial_Programming:Unix/termios
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Chris Tyler has some idea for controller and coins...
1. ctyler connects DSR and DTR lines on serial port to switch, write 6 lines of code to make RS232 DSR transition generate synthetic X input event
2. ctyler connects switch to power supply and solenoid, places solenoid over button on USB numeric keypad, plugs keypad into PC