Routines
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D2E9: The update routine for a conveyor that carries things backwards in U
Graphic 141; the same code as CONVEYOR_PLUS_U, a copy for each graphic. No room has one: this never ran in the build's sessions.
Input
IX the object record
CONVEYOR_MINUS_U D2E9 CALL DRAW_AT_L16_D8 the drawing nudge; ready to push again; move without falling
D2EC RES 3,(IX+$0D)
D2F0 CALL CLIP_AND_MOVE
D2F3 RET
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