/* *******************************************************************
	This function writes the byte value to the specified port.
	Valid ports are PORTA, PORTB, PORTCL and PORTCH.
*********************************************************************** */
int DOut(int Port, int ByteValue)   
{
	int result;
	int BitData;

	switch (Port)
	{
	case PORTA:
		result = DBitIn(Port, 4, &BitData);
		if (BitData == 1)
			return(3); /* error - not configured for output */
		break;
	case PORTB:
		result = DBitIn(Port, 1, &BitData);
		if (BitData == 1)
			return(3); /* error - not configured for output */
		break;
	case PORTCL:
		result = DBitIn(Port, 0, &BitData);
		if (BitData == 1)
			return(3); /* error - not configured for output */
		break;
	case PORTCH:
		result = DBitIn(Port, 3, &BitData);
		if (BitData == 1)
			return(3); /* error - not configured for output */
		break;
	default:
		return (0); /* error - illegal port */
		break;
	}
	
	outb(ByteValue, Port); /* write the port data */

	return(0); /* no errors detected */
}