Here's an instructional DIY video on how to extend your I/Os using 74HC595 chip and CUBLOC CB280. The input/output of a computer's memory can be enhanced with a modification using a microprocessing board and a mini-board. Watch this video computer-circuitry tutorial and learn how to extend I/O on a computer using a 74HC595 mini-board and a CUBLOC CB280.
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You can actually connect the serial out pin on a 74HC595 to another 74HC595 and chain them. You could setup 100s of outputs only using 3 pins.
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