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I'm trying to understand how to register files. The question below is from past exam paper:

The following diagram shows the register-file from a simple 8-bit machine enter image description here

enter image description here

I don't fully get register files but is R3=AA becasue it is the 3rd row from the top? So, you input hexadecimal 0x55 to DA then it writes it to AA which is R3?

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