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Summary OCR GCSE Computer Science - 1.1 Systems Architecture £7.49   Add to cart
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Summary OCR GCSE Computer Science - 1.1 Systems Architecture
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Created by a student who achieved 10 grade 9s at GCSE, this mindmap covers everything you need to know from Section 1.1 of the OCR GCSE Computer Science specification, Systems Architecture. Be sure to check out the other mindmaps in this series!

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  • February 3, 2024
  • 1
  • 2023/2024
  • Summary

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Central processing unit

1)Fetch instruction from RAM

2) Copy memory address from the PC to the MAR​
Fetch
3) Copy the instruction stored in the MAR to the MDR​

4) Increment the PC ready for next cycle​

The instruction in the MDR is decoded by the CU.
Decode Carries out instructions using
​The CU may then prepare for the next step.​ fetch-decode-execute cycle

- Loading data from memory​

- Write data to memory​

- Do a calculation or logic The instruction is performed.
Execute
operation and hold it in the ACC​ Examples include:
takes input
- Change the address in the PC​
Does this via a
computer program
processes data What is

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