public void handler() {
            PORT_START();
            /* IN0 */
            PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_COIN1);
            PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_COIN2);
            PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT | IPF_2WAY);
            PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT | IPF_2WAY);
            PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_BUTTON1);
            PORT_DIPNAME(0x20, 0x00, DEF_STR("Cabinet"));
            PORT_DIPSETTING(0x00, DEF_STR("Upright"));
            PORT_DIPSETTING(0x20, DEF_STR("Cocktail"));
            PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_UNKNOWN);/* "reset" on schematics */
            PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_COIN3);

            PORT_START();
            /* IN1 */
            PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_START1);
            PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_START2);
            PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT | IPF_2WAY | IPF_PLAYER2);
            PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT | IPF_2WAY | IPF_PLAYER2);
            PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_BUTTON1 | IPF_PLAYER2);
            PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_UNKNOWN);/* probably unused */
            PORT_DIPNAME(0xc0, 0x00, DEF_STR("Difficulty"));
            PORT_DIPSETTING(0x00, "Easy");
            PORT_DIPSETTING(0x40, "Medium");
            PORT_DIPSETTING(0x80, "Hard");
            PORT_DIPSETTING(0xc0, "Hardest");

            PORT_START();
            /* DSW1 */
            PORT_DIPNAME(0x03, 0x00, DEF_STR("Coin_A"));
            PORT_DIPSETTING(0x03, DEF_STR("4C_1C"));
            PORT_DIPSETTING(0x02, DEF_STR("3C_1C"));
            PORT_DIPSETTING(0x01, DEF_STR("2C_1C"));
            PORT_DIPSETTING(0x00, DEF_STR("1C_1C"));
            PORT_DIPNAME(0x0c, 0x00, DEF_STR("Coin_B"));
            PORT_DIPSETTING(0x00, DEF_STR("1C_1C"));
            PORT_DIPSETTING(0x04, DEF_STR("1C_2C"));
            PORT_DIPSETTING(0x08, DEF_STR("1C_3C"));
            PORT_DIPSETTING(0x0c, DEF_STR("Free_Play"));
            PORT_BIT(0xf0, IP_ACTIVE_HIGH, IPT_UNUSED);
            INPUT_PORTS_END();
        }