I don't recall if your PIC had a serial port, which would make a
difference.  I've got several products that are simultaneously sending
and receiving DMX, scanning pots and keyswitches, exchanging data with
printer ports, etc.  These are all with a single 16c74 running at 16 MHz.
 If you're bit banging... good luck!

Harold



Harold Hallikainen
harold@hallikainen.com
Hallikainen & Friends, Inc.
See the FCC Rules at http://hallikainen.com/FccRules and comments filed
in LPFM proceeding at http://hallikainen.com/lpfm

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