Routines
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B4A3: Sound: a plain beep of 16 waves
Used by the routines at check_for_start_game, start_pickup_drop and upd_103.
Used when an object is picked up or dropped, when an extra life is collected, and when the control menu's choice changes.
toggle_audio_hw_x16 B4A3 LD BC,$8010 16 waves at half-wave count 128
B4A6 JR toggle_audio_hw_xC
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