For "send" transmissions, I have had success "bit-banging" SIR at 19200bps to both my palm-pilot and to a laptop. No 38kHz modulation needed. It was a bit of a pain finding something to receive on my palm--Pocketerm II worked best, but the laptop was much simpler. I'm not at all clear on the best way to receive SIR though. I assume that there's a bunch of signal conditioning needed to detect spikes in IR--perhaps someone in [ee] could help us with that. The IrDa transceiver modules seem to cost several dollars; has anyone else used these with a PIC? Jason Neudorf -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.