public void handler() {
            /* skip the long IC CHECK in Teddyboy Blues and Choplifter */
            /* this is not a ROM patch, the game checks a RAM location */
            /* before doing the test */
            memory_region(REGION_CPU1).write(0xeffe, 0x4f);
            memory_region(REGION_CPU1).write(0xefff, 0x4b);

            system1_define_sprite_pixelmode(system1_SPRITE_PIXEL_MODE2);
            system1_define_background_memory(system1_BACKGROUND_MEMORY_SINGLE);
        }