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The PIA is designed for glueless connection to the [[Motorola 6800]] style [[bus]], and provides 20 I/O lines, which are organised into 2 8-bit bidirectional ports (or 16 general-purpose I/O lines) and 4 control lines (for handshaking and interrupt generation). The directions for all 16 general lines (PA0-7, PB0-7) can be programmed independently. The control lines can be programmed to generate interrupts, automatically generate handshaking signals for devices on the I/O ports, or output a plain high or low signal.
It was used in [[Atari 800]] family of computers (to provide four joystick ports to the machine).
==References==
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