Jim Robertson wrote:
> but Olin has something along these lines

Thanks, yes I do.  It's called the RSLink
(http://www.embedinc.com/products).  It has a DB-9 connector on one end that
connects to a PC COM port via a straight thru extension cable.  On the
Microcontroller side you connect it to 5V, ground, and the PIC UART RX and
TX lines.  It does the signal inversion and level conversion to RS-232.

It would be easier and cheaper to use a PIC with a UART built in.  The
16F648A has the same footprint, a hardware UART, more program memory, more
RAM, a few other nice peripherals, and costs less than the 16F84.


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