Routines
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B31C: Rest
Used by the routine at play_note.
Silence for one to four units, each 17163 turns of a 26 T-state loop: about 0.127 seconds, a little shorter than a note's unit. None of the four tunes uses a rest.
Input
DE the address of the note byte; on exit, the next one
snd_delay B31C LD A,(DE) the length, one to four units
B31D INC DE
B31E RLCA
B31F RLCA
B320 AND $03
B322 INC A
B323 LD L,A
B324 LD BC,$430B 17163 turns per unit
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