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  3. 20 points totally consider the following basic input routine poll...

Question: 20 points totally consider the following basic input routine poll...

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(20 points totally) Consider the following basic input routine. POLL LDI Re, DevRegPtr1 BRzp POLL LDI Re, DevRegPtr2 DevRegPtr1 .FILL XFE00 DevRegPtr2·FILL XFE02 a. (5 points) What will be contained in Re immediately after the first instruction is executed? Choose your answer from one of the four I/O device registers. b. (10 points) Explain the execution of the second instruction based on the content of Re. c. (5 points) What will be contained in R0 immediately after the third instruction is executed? Choose your answer from one of the four I/O device registers.

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