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Now the fun begins. The next instruction is "LDS". This instruction first copies the contents of S into the MAR and initiates a memory read. Since 2500 is in the MAR, it is as if the CSC-1 computer had executed a "LOD 2500" instruction: 
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Now the fun begins. The next instruction is "LDS". This instruction first copies the contents of S into the MAR and initiates a memory read. Since 2500 is in the MAR, it is as if the CSC-1 computer had executed a "LOD 2500" instruction:
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