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D519: Wait for SPACE to be let go, then sound
Without this the press that paused the game would also end the pause.
debounce_space_press D519 LD A,$7E wait until SPACE is up
D51B CALL read_port
D51E BIT 0,A
D520 JR NZ,debounce_space_press
D522 CALL toggle_audio_hw_x24 the pause sound
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