Try..
Code:
        @   __CONFIG _XT_OSC & _WDT_OFF & _CP_OFF
        
        PORTB = 0
        TRISB = 0
        
        DATA 0,1,2,4,8,16,32,64,128
        
        Addr var byte
        
        for Addr=0 to 8
            read Addr, PORTB
            PAUSE 500
            NEXT
            
        STOP
and make sure you have MCLR pin tied to VCC via a resistor. Cap always have to be there. 0.1, 0.22, 0.47 or whatever else in that range.