public void handler() {
            PORT_START();       /* IN0 */

            PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_COIN1);
            PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_COIN2);
            PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_COIN3);
            PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_UNKNOWN);
            PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_START1);
            PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_START2);
            PORT_BITX(0x40, 0x40, IPT_SERVICE, DEF_STR("Service_Mode"), KEYCODE_F2, IP_JOY_NONE);
            PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNKNOWN);

            PORT_START();       /* DSWA (not used, EEPROM) */

            PORT_BIT(0xff, IP_ACTIVE_LOW, IPT_UNKNOWN);

            PORT_START();       /* DSWB (not used, EEPROM) */

            PORT_BIT(0xff, IP_ACTIVE_LOW, IPT_UNKNOWN);

            PORT_START();       /* DSWC */

            PORT_DIPNAME(0x08, 0x08, "Freeze");
            PORT_DIPSETTING(0x08, DEF_STR("Off"));
            PORT_DIPSETTING(0x00, DEF_STR("On"));
            PORT_BIT(0xf7, IP_ACTIVE_LOW, IPT_UNKNOWN);

            PORT_START();       /* Player 1 */

            PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT | IPF_8WAY | IPF_PLAYER1);
            PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT | IPF_8WAY | IPF_PLAYER1);
            PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN | IPF_8WAY | IPF_PLAYER1);
            PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_UP | IPF_8WAY | IPF_PLAYER1);
            PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_BUTTON1 | IPF_PLAYER1);
            PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_BUTTON2 | IPF_PLAYER1);
            PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNKNOWN);
            PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNKNOWN);

            PORT_START();       /* Player 2 */

            PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT | IPF_8WAY | IPF_PLAYER2);
            PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT | IPF_8WAY | IPF_PLAYER2);
            PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN | IPF_8WAY | IPF_PLAYER2);
            PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_UP | IPF_8WAY | IPF_PLAYER2);
            PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_BUTTON1 | IPF_PLAYER2);
            PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_BUTTON2 | IPF_PLAYER2);
            PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNKNOWN);
            PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNKNOWN);
            INPUT_PORTS_END();
        }