61 rows of three bytes, indexed by the low six bits of a note: the first two are the B and C counts that time each half-wave in note_wave, and the third is how many waves make one unit of length. Row 0 stands for a rest and is never read.

The rows go up a semitone at a time for five octaves. The comments give each row's pitch as worked out from the loop timings at 3.5MHz, and the step of an equal-tempered scale it stands for -- G#1 at row 1, A4 (440Hz) at row 38. The timing drifts across the range: the low rows come out about a fifth of a semitone sharp and the top rows up to half a semitone flat. Part of the flatness at the top is the 101 T-states each wave spends outside its two waits, which weigh more as the waits get shorter; why the bottom is sharp has not been worked out. Row 18 is the one real fault, noted below.