Routines
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6828: Plays the explosion sound effect.
The note pitch goes from `low` to `high`.
Used by the routine at 6814.
Input
C note frequency.
6828 ld a,$10
682a out ($fe),a Turn speaker ON
682c ld b,c Set duration
682d djnz $682d Note continues for the frequency duration
682f xor a
6830 out ($fe),a Turn speaker OFF
6832 ld b,c
6833 djnz $6833 Silence for the frequency duration
6835 dec c Decrement frequency (higher pitch)
6836 jr nz,$6828 Repeat until frequency is zero
6838 ret
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