RE: (slightly OT:) Parallel port question

From: Baltissen, GJPAA (Ruud) (
Date: 2003-10-20 11:44:23

Hallo Groepaz,

> almost every (SPP-) parallelport "behaves like" a 8255.

This point of view is new for me. What computer(s) used a 8255 for their
LPT-port? IBM did not. And most clones based their designs on the ones of

Using a 8255 has an advantage: it saves space, certainly in a
laptop/dragable. The disadvantage: it cannot be used as a bi-directional
port using 'normal' software like Star Commander. The used 8255-port is
bi-directional but changing its direction means writing to the command
register, one the IBM bi-directional LPT-port doesn't know.

   / __|__
  / /  |_/     Groetjes, Ruud
  \ \__|_\



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