Interrupts on a PIC18

Ok, I THOUGH I was following the C18 compiler User guide to a T, but I
am having trouble getting the interrupts to work right.

I am working with a PICDEM HPC, which has a 18F8722 as the main chip,
I am just trying something simple to get an understanding of their
interrupt system.

The HPC demo board has 8 LEDs on PortD, the code powers every other
LED 1010 1010.

When I don't include the ioA.x files in my project - everything works
as expected.  When I reset the board, the 4 LEDs come on.  But when I
compile the code w/ ioA.c and ioA.h as part of the project, then
nothing happens.  When I reset the board, the LEDs light up.

So:
1. Is something wrong w/ my code (which does compile BTW)?
2. Am I expecting the wrong thing to happen?
3. ???

Stumped, looking for some direction.
RonB


//main.c

#include <p18cxxx.h>
#include "ioA.h"
#include "ports.h"
#include "RS232_IO.h"


void setup(void)
{
	setupPorts();
	RCON = 0x80;
	IPR1 = 0x20;
	INTCON = 0x80;
}

void main(void)
{
	setup();
	while(1){};
}

//-------------------------
// ports.c

#include <p18cxxx.h>
#include "ports.h"

void setupPorts(void)
{
	LATD = 0xAA;
	TRISD = 0;
}

//-------------------------
// ports.h

#ifndef PORTS_H
#define PORTS_H

void setupPorts(void);

#endif

//-------------------------
// ioa.c

#include <p18cxxx.h>
#include	"IOA.H"
#include	<usart.h>


#pragma code rx_interrupt=0x08
void rx_int(void)
{
	_asm goto rx_handler _endasm
}
#pragma code


#pragma interrupt rx_handler
void rx_handler(void)
{
	PIR1bits.RCIF = 0;
}
#pragma code

//-------------------------
// ioa.c

#ifndef IOA_H
#define IOA_H

void rx_handler(void);

#endif

//-------------------------
// ioa.h

#ifndef IOA_H
#define IOA_H

void rx_handler(void);

#endif