Interfacing to the
IBM-PC Parallel Printer Port

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.

 pinout diagram

25-way Female D-Type Connector


Various enhanced versions of the original specification have been introduced over the years

so now the original is commonly referred to as the

Standard Parallel Port (SPP)

IntroductionProgramming ConsiderationsRegisters and Pinouts

Reading and Writing DataHow many ports are present and where


 Project Proposals

 Other Sources of Information

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last updated: 26-Jan-98 Ian Harries <>