Three-state logic
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General-purpose input/output
GPI
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Land Warrior
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Digital Command Control
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Yamaha YM2612
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Serial Peripheral Interface
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Memory-mapped I/O and port-mapped I/O
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SD card
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Single-board computer
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Observer pattern
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Video Toaster
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Breadboard
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Universal asynchronous receiver-transmitter
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Shift register
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Microcontroller
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Commodore 64
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General Purpose IO
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