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Parallelport

The original IBM-PC's Parallel Printer Port had a total of 12 digital outputs and 5 digital inputs accessed via 3 consecutive 8-bit ports in the processor's I/O space.

    • 8 output pins accessed via the DATA Port
    • 5 input pins (one inverted) accessed via the STATUS Port
    • 4 output pins (three inverted) accessed via the CONTROL Port
    • The remaining 8 pins are grounded



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