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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]

Systems architecture Questions

Practise AQA GCSE Computer Science Systems architecture with exam-style questions for GCSE Computer Science. 42 questions, matched to the AQA GCSE Computer Science (8525) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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Systems architecture Questions

  1. GCSE
  2. /Computer Science
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