Routines
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9105: Move the conveyor in the current cavern
 Used by the routine at 870E. 9105 LD HL,(\$8070) Pick up the address of the conveyor's location in the screen buffer at 7000 from 8070 9108 LD E,L Copy this address to DE 9109 LD D,H 910A LD A,(\$8072) Pick up the length of the conveyor from 8072 910D LD B,A B will count the conveyor tiles 910E LD A,(\$806F) Pick up the direction of the conveyor from 806F 9111 OR A Is the conveyor moving right? 9112 JR NZ,\$9127 Jump if so The conveyor is moving left. 9114 LD A,(HL) Copy the first pixel row of the conveyor tile to A 9115 RLC A Rotate it left twice 9117 RLC A 9119 INC H Point HL at the third pixel row of the conveyor tile 911A INC H 911B LD C,(HL) Copy this pixel row to C 911C RRC C Rotate it right twice 911E RRC C 9120 LD (DE),A Update the first and third pixel rows of every conveyor tile in the screen buffer at 7000 9121 LD (HL),C 9122 INC L 9123 INC E 9124 DJNZ \$9120 9126 RET The conveyor is moving right. 9127 LD A,(HL) Copy the first pixel row of the conveyor tile to A 9128 RRC A Rotate it right twice 912A RRC A 912C INC H Point HL at the third pixel row of the conveyor tile 912D INC H 912E LD C,(HL) Copy this pixel row to C 912F RLC C Rotate it left twice 9131 RLC C 9133 JR \$9120 Jump back to update the first and third pixel rows of every conveyor tile
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