>
> I'm looking for a microcontroller development system that receives
> input from device A through an RS232 port, processes the data, and
> then transmits the processed data to device B through an another
> RS232 port. I would also like to program/develop the software via
> a host computer.
>

EMAC INC has several single board computers and development systems in
Basic, C, or assembler that have the provision for 3 serial ports on a
single board. There home page is www.emacinc.com. Check it out.

Eric