
generic 8255




The classic in digital I/O.  Three channels of 8 bit digital I/O,
each channel is I/O configurable, channels 0 and 1 in 8 bit units,
channel 2 in 4 bit units.  The driver does not support modes 1 or 2
yet, since I don't really understand how they would potentially be used.
(Send me email if you want to use these modes.)  If and when
modes 1 and 2 are supported, there is a strong possibility that the
3rd channel will be split into two 4-bit channels.  (Refer to the
8255 spec for clues as to why.)



David Schleef
<ds@stm.lbl.gov>

