I've got a friend I'm helping out who wants to implement a 1200 Buad
MODEM in a PIC.

Has anyone achieved this?  I think I have heard of people getting 300
Baud MODEMs to work.

He seems to think we can take something like a PIC16C65 and load the PWM
unit with several different sine wave table lookups with the right phase
relationships to represent the zeroes and ones.

He thinks we just have to make a 1200 Hz sine wave with a small bit of
variability to get things to work on the TX side.

Is it really this simple?  Does anyone know where I can find a copy of
the BEL whatever spec for this on the net?

On the RX side, I'm not sure who to do this simply.  Does anyone know
that tricks?  Can we reshape the sine wave into a square wave(easy) and
us interrupts to figure out phase relationships?

What are the complications of doing this in a PIC?

If 1200 Baud is out of the question, does anyone know where I can find
the data to straightfowardly implement 300 Buad?  Microchip doesn't have
any app-notes on this published.

Regards, Bob Lowell