i'm not really familiar with the 16c74 but many people here shy away from
longer code segments so i give it a try
what seemed obvious in simulation is that the led's display and inmediately
get cleared (if the receiver gets set up correctly , i did not check),  you
are looping to start which clears port b (within microseconds ) you never
see them blink

make the last part of your program
loop    movf RCREG,W         ;Get input data
    movwf   PORTB           ;Display on LEDs
    movwf   TXREG           ;Echo character back
    goto    loop

    end


-----Original Message-----
From: Aidi Moubhij <aidi@MJR.COM>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Tuesday, May 04, 1999 12:53 PM
Subject: PIC16c74


> Hi,
>
>I'm using the code below to receive a byte from the US ART. When I get the
>byte I display it on the LED's and echo it back.
>This code is not working for me.  Can anybody tell me what I'm doing wrong.
> Thanks
>
>
> list p=16c74
>        Title "first aidi Program"
>
>        include <P16C74.INC>
>
>        org     00h
>
>Start
>    clrf    PORTB           ;Clear PORT_B output latches
>
>        bsf     STATUS,RP0      ;Go to Bank1
>
>        clrf    TRISB           ;Config PORT_B as all outputs
>
>
>        movlw   19h             ;Set Band rate (9600 baud @4MHz)
>        movwf   SPBRG
>        movlw   b'00100100'     ;8-bit transmit, transmitter enable
>        movwf   TXSTA           ;Asynchronous mode, High baud rate
>
>        bcf     STATUS,RP0      ;Go to Bank0
>
>        movlw   b'10010000'     ;8-bit receive, receiver enabled
>        movwf   RCSTA           ;serial port enabled
>
>        movf    RCREG,W         ;Get input data
>        movwf   PORTB           ;Display on LEDs
>        movwf   TXREG           ;Echo character back
>        goto    Start
>
>        end
>
>
>
>
>Aidi Moubhij
>
>aidi@mjr.com