Routines
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B21C: The update routine for a block that shuttles to and fro in V (graphic 67)
Object template 14. A note pitched by V every turn, then SHUTTLE_U's common part, set up for V: it reads +2 and sets +A. Knight Lore's upd_55.
Input
IX the block
SHUTTLE_V B21C CALL BEEP_BY_V a note pitched by V
B21F LD HL,$020A H = 2 (V), L = 10 (its step)
B222 JR SHUTTLE_BLOCK
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