I bit banged RS-232 on an output pin to talk to the GPS and used the usart 
to communicate RS-232 to a PC and it worked fine.
FJ

Hi,
        I am using pic18f452, and i am trying retrieve data from gps 
reciever
and then send data using gsm

network,  but how i can connect both gps and gsm to pic18f452 (serial
connection), so that the

trasmission and reception is done simultaneously  (for real time
application).
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