From: Baltissen, GJPAA (Ruud) (ruud.baltissen_at_abp.nl)
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
IBM.
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.
--
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/ / |_/ Groetjes, Ruud
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