Routines
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B2BE: Play a tune until a key is pressed
Used by the routines at keypress_tune_note and await_restart.
Checks the keyboard before every note and stops at once if any key is down. Used for the menu and game-over tunes, which the player may want to skip.
Input
DE the tune
play_audio_until_keypress B2BE XOR A A=0 selects every half-row at once, so any key at all counts
B2BF CALL read_port
B2C2 JR Z,keypress_tune_note a key: stop
B2C4 RET
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