Please have a look at www.lirc.org.  (The page seems to be down right
now.  Try google archives if it continues down.)  There are hardware
schematics for IR receivers and transmiters, recorded codes for many
remotes, and software that runs on linux and windows.  I've got an
alternate lirc transmitter at http://www.blars.org/blarslirc/

The normal "serial port" version is actually bit-banging the serial
control lines.
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Blars Blarson                   blarson@blars.org
                                http://www.blars.org/blars.html
"Text is a way we cheat time." -- Patrick Nielsen Hayden

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