Routines
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B6B1: Shuttling block, north-south (type 55)
The block_ns block (block_ns). Sets up shuttle_block to work on Y and dY.
upd_55 B6B1 CALL sound_pitch_from_y sound pitched by Y
B6B4 LD HL,$020A H = 2 (Y), L = 10 (dY)
B6B7 JR shuttle_block
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