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Google it, you should easily find software UARTs code in C for PIC's, mind you they're typically sensative to the clock speed of the PIC you're running, a lot moreso than hardware because it's done all in software using interupts.
Depending on how much data you're transmitting between the two devices you may run out of processing speed fast enough to handle both the hardware and software uarts at the same time though and you'll start getting corrupted data.
Does somebody have "Software USART" code in C?
What C compiler do you use? Microchip have examples for C18 in their reference guide that explain how to use both hardware and software USART.
Nigel I'm not wrong just backwards close enough to wrong though, I was thinking of receiving. For reception at some point an interrupt is going to cause an ISR during the software UART's delay routine and desync it.