ITSU1001 Introduction to Computer Systems and Networking

The following questions are designed based on the lectures completed to the date.

Answer all the questions. (This tutorial accounts for 3% of the total unit assessment)

Question 1. The following figure shows how the MAR and MDR registers are connected.

1. What are the meanings of msb and lsb?
2. How many bits are represented by the small boxes (circled) shown on the right-hand side?
3. Explain how the size of MAR is related to memory capacity.
4. What is the capacity of this memory?
5. Explain the process of accessing memory with MAR and MDR registers
6. Where are MAR and MDR located?

Question 2.Explain the Fetch-Execute cycle of a CPU?

Question 3.What happens to the Program Counter after each Fetch-Execute cycle?

Question 4.The following Fetch/Execute cycle is used to load a value in particular memory address to register ‘A’. Explain this five-step cycle in your words.

Question 5.Write down the Fetch/Execute cycle for an instruction saying to write the value in register ‘A’ to a memory location specified by [address].

Question 6.Most modern computers provide many general-purpose registers and very few memory access instructions. Most instructions use these registers to hold data instead of memory. What are the advantages to such an architecture?

Question 7.Create the fetch–execute cycle for an instruction that moves a value from general-purpose register-1 to general-purpose register-2. Compare this cycle to the cycle for a LOAD What is the major advantage of the MOVEover the LOAD?

Question 8.The Little Prince Computer (LPC) is a mutant variation on the LMC. (The LPC is so named because the differences are a royal pain.) The LPC has one additional instruction. The extra instruction requires two consecutive words:

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