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Question 1 (20 Marks) a) Why is it important for us to develop good designs in Computer Architecture? Give two reasons. [2Marks] b) In the design of a processor chip, suggest two aspects that could --to improved performance. Explain your answer. [2Marks] c) What is the performance implication of designing one microprocessor using RISC and the other one as CISC architecture in modern machines? [2Marks]? d) Consider two machines where one is a uniprocessor and the other is a multiprocessor. Explain two techniques, one for each machine that are used to speed up execution of processes. [4Marks ] e) Explain any three signals that are mandatory in a system bus to enable it to perform its control function adequately. [3Marks] f) Describe two techniques that are used to keep the copy of file in the cache consistent with that in main memory. Give a disadvantage of each. [4Marks] g) Suppose we had a computer that uses 0.2 us to access registers and 5ms to access memory. How much time would it take to access an instruction using the following addressing modes? [3Marks] a) Register Indirect b) Indirect h) Consider a requirement where we need to add a new type of instruction to the control unit. Which type of control unit would you propose to use for this task and why? [2Marks]