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

/* Get BRK Handler Address      *
 * Returns: Status              *
 *            $00 = modifiable  *
 *            $7F = hard coded  *
 *            $FF = unavailable *
 *          Address MSB         *
 *          Address LSB         */
char getbrk();

/* Get IRQ Handler Address      *
 * Returns: Status              *
 *            $00 = modifiable  *
 *            $7F = hard coded  *
 *            $FF = unavailable *
 *          Address MSB         *
 *          Address LSB         */
char getirq();

/* Get NMI Handler Address      *
 * Returns: Status              *
 *            $00 = modifiable  *
 *            $7F = hard coded  *
 *            $FF = unavailable *
 *          Address MSB         *
 *          Address LSB         */
char getnmi();

/* Get RESET Handler Address    *
 * Returns: Status              *
 *            $00 = modifiable  *
 *            $7F = hard coded  *
 *            $FF = unavailable *
 *          Address MSB         *
 *          Address LSB         */
char getrst();

/* Set BRK Handler Address      */
 * Args: &d - New Address       *
 * Returns: Result              * 
 *            $00 = modifiable  *
 *            $7F = hard coded  *
 *            $FF = unavailable *
char setbrk();

/* Set IRQ Handler Address      */
 * Args: &d - New Address       *
 * Returns: Result              * 
 *            $00 = modifiable  *
 *            $7F = hard coded  *
 *            $FF = unavailable *
char setirq();

/* Set NMI Handler Address      */
 * Args: &d - New Address       *
 * Returns: Result              * 
 *            $00 = modifiable  *
 *            $7F = hard coded  *
 *            $FF = unavailable *
char setnmi();

/* Set RESET Handler Address    */
 * Args: &d - New Address       *
 * Returns: Result              * 
 *            $00 = modifiable  *
 *            $7F = hard coded  *
 *            $FF = unavailable *
char setrst();

/* Exit from IRQ Interrupt */
xitirq: