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Go to microchip web site and find the user guide for the PICDEM2+. inside you will see the circuit for a 40 pin device ( 16F877 ) and the interface for the UART. use that as a referance design.
You can also find code sample on how to use the UART.
As mencioned above you just need a MAX232 and a few capacitors to connect the PIC to the PC using serial coms.
Most of C compiler already include libraries for serial com.
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