PIC18F4550 help please

I have a problem using a PIC18F4550. Here is my code

Code:

---

DEFINE OSC 20
'rcsta.7 = 0 tried turning usart off but not work
store var byte
number var word
let number = 65531

tx  var portc.6
rx  var portc.7
led1    var portd.0
led2    var portd.1
low led1
low led2
input rx
high tx

PAUSE 1000
high led1
serout tx, 2, ["Hello"]
pause 500
serout tx, 2, [#number]

start:
serin rx, 2, ["A"], store

pause 1000
low led1
high led2

serout tx, 2, [#store]

pause 1000
low led2
high led1
goto start

end

---

I am using a terminal program to test serial comms. If I compile for a pic16f871 it works fine, but compiled for a 18f4550 i just get garbage and the pic does not seem to receive anything.

Can anyone tell me what i'm doing wrong please?

You might have the oscillator config options set to run the CPU at 48MHz.

Try DEFINE OSC 48. If it works, that's the problem.