Routines
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C1A1: Is the object moving?
Used by the routines at upd_96_to_102, upd_85 and dec_dZ_upd_XYZ_wipe_if_moving.
Input
IX the object
F on exit, Z set if its dX, dY and dZ (+$09 to +$0B) are all zero
is_obj_moving C1A1 LD A,(IX+$09)
C1A4 OR (IX+$0A)
C1A7 OR (IX+$0B)
C1AA RET
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