O-LevelComputer ScienceHardware2210/11 · May/June 2022 · Q25 Marks
A computer is designed using the Von Neumann model for a computer system. The computer has a central processing unit (CPU).
- (a)(i)Data is fetched from primary storage into the CPU to be processed. State the name of the primary storage from where data is fetched.[1]
- (a)(ii)The CPU performs a cycle to process data. Fetch is the first stage in this cycle. State the names of the second and third stages in the cycle. Second stage Third stage[2]
- (a)(iii)Identify two components within the CPU that are used in the fetch stage of the cycle. Component 1 Component 2[2]
Mark scheme
Marking points from the official mark scheme (May/June 2022). The mark or mark type is shown in brackets.
- [1] Random access memory // RAM
- [2] One mark for each correct stage Second stage Decode Third stage Execute
- [2] Any two from: Memory address register // MAR Memory data register //MDR Program counter // PC Control unit // CU Address bus Data bus Control bus
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