/*********************************************************
 * vector - 6502 Interrupt Vector Manipulation Functions *
 *********************************************************/

/* Get Maskable Interrupt Address       *
 * Returns: $00 If Address can be       *
 *              modified, otherwise $FF *
 *          Address MSB                 *
 *          Address LSB                 */
char getirq();

/* Get Non-Maskable Interrupt Address   *
 * Returns: $00 If Address can be       *
 *              modified, otherwise $FF *
 *          Address MSB                 *
 *          Address LSB                 */
char getnmi();

/* Get "Reset" Interrupt Address        *
 * Returns: $00 If Address can be       *
 *              modified, otherwise $FF *
 *          Address MSB                 *
 *          Address LSB                 */
char getrst();

/* Set Maskable Interrupt Address   */
 * Args: &d - New Interrupt Address *
 * Returns: $00 If Successful,      * 
 *              otherwise $FF       */
char setirq();

/* Set Non-Maskable Interrupt Address   */
 * Args: &d - New Interrupt Address     *
 * Returns: $00 If Successful,          * 
 *              otherwise $FF           */
char setnmi();

/* Set "Reset" Interrupt Address    */
 * Args: &d - New Interrupt Address *
 * Returns: $00 If Successful,      * 
 *              otherwise $FF       */
char setrst();