Basic Arduino TI99/A4 Keyboard Interface

I took an old, defunct TI99/A4 computer and hooked up its keyboard to an Arduino. The arduino uses two output pins to control a Serial-to-Parallel IC, which in turn controls two 3-bit-address Multiplexers/Demultiplexers. With this setup, the program repeatedly scans all the possible key connector combinations and looks for short circuits - these mean a key was pressed. A few more software bits write the input to the serial monitor.

Basic Arduino TI99/A4 Keyboard Interface avril songs
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Science & Technology	Upload TimePublished on 9 May 2012

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