ym_mpu401_hw_if   120 dev/isa/ym.c   struct midi_hw_if ym_mpu401_hw_if = {
ym_mpu401_hw_if   150 dev/isa/ym.c   	struct midi_hw_if *mhw = &ym_mpu401_hw_if;
ym_mpu401_hw_if   176 dev/isa/ym.c   			mhw = &ym_mpu401_hw_if;