Routines
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B4ED: Sound: one wave
Used by the routines at materialise_sweep, jump_sweep, transform_warble and toggle_audio_hw_xC.
Speaker bit on for B turns of a 13 T-state loop, then off for as long, with the border black throughout. A count of 128 comes out at about 1kHz.
Input
B the half-wave count, kept
toggle_audio_hw B4ED LD A,$10 speaker on; keep B
B4EF OUT ($FE),A
B4F1 LD A,B
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