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Systems architecture

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Question 8

Five components of a CPU are listed below:

  • A. Current Instruction Register (CIR)
  • B. Memory Data Register (MDR)
  • C. Memory Address Register (MAR)
  • D. Program Counter (PC)
  • E. Arithmetic Logic Unit (ALU)

For each row in Table 1, choose the letter (A, B, C, D, or E) that best matches the description. Letters should not be used more than once.

Table 1

DescriptionLetter (A-E)
Holds the memory address of the instruction or data currently being read from or written to.
Temporarily holds the data or instruction that has just been read from or is about to be written to main memory.
Holds the instruction that is currently being decoded and executed.
[3]
Markscheme

Systems architecture Questions

  1. GCSE
  2. /Computer Science
  3. /Systems architecture

37 exam-style questions on AQA GCSE Computer Science Systems architecture. Each one has a worked solution and a mark scheme showing where the marks go.

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