The following instructions are executed on a CPU which has R=20 and PC=20 for each instruction. The

The following instructions are executed on a CPU which has R=20 and PC=20 for each instruction. The instructions each occupy two memory locations and set AC to the value shown. What are the contents of memory locations 20, 21 and 22?

LDAC $0 sets AC=22

LDAC 20 sets AC=21

LDAC @R sets AC=20

 

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