>         Has anyone used the interupt driven RS232 comms
> program in microchip AN555 on the 16C84?
>
>         From what I can see, it is for the 16C71.
I have used a modified version to work on different pins.  Since I couldn't use
 the interrupt for the
Receive I used the timer Interrupt (TMR0) to check for Receive Data.
I actually implemented mine fully in the ISR where you simply set a flag when
 you have transmit data
available and a flag is set when receive data is available.
I had very little problems making the modifications and getting it to work.

If you have any problems implementing it, let me know and I will see what I can
 do to help.

Good luck!

Alan G. Smith
+---------------------------------------------------------
| Alan G. Smith
| ags@poboxes.com
| http://www.innovatus.com/ags