ADDRESS_MAP_EXTERN(timeplt_sound_readmem); ADDRESS_MAP_EXTERN(timeplt_sound_writemem); ADDRESS_MAP_EXTERN(locomotn_sound_readmem); ADDRESS_MAP_EXTERN(locomotn_sound_writemem); extern struct AY8910interface timeplt_ay8910_interface; WRITE8_HANDLER( timeplt_sh_irqtrigger_w );