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2015-01-19 Paul Boddie Renamed the source file to reflect the actual IC in use.
2015-01-19 Paul Boddie Fixed the command definitions and pin usage; made changes to help debugging.
2015-01-18 Paul Boddie Simplified the interfacing, dropping the multiplexer and data latch.
2015-01-18 Paul Boddie Removed the output latch; introduced a multiplexer to separate the data channels.
2015-01-18 Paul Boddie An initial design using four 74HC273 ICs: three for output, one for input.
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