‹ GCSE Computer Science
Computer systems
The CPU and the fetch-execute cycle step by step, what makes a CPU fast, RAM, ROM and virtual memory, secondary storage, and system software.
Start: The CPU and the fetch-execute cycle About 25 min, free
Lessons
Practise and test
By the end you can
Describe the parts of the CPU and the fetch-execute cycle Trace registers through a short program Explain clock speed, cores and cache Compare RAM, ROM, cache and virtual memory Choose secondary storage and calculate capacity and transfer times Describe what an operating system and utility software do Write 8-mark extended answers in the OCR style Revision notes
Specifications AQA 8525 3.4.1, 3.4.3 and 3.4.5OCR J277 1.1.1 to 1.1.3, 1.2.1, 1.2.2, 1.5.1 and 1.5.2Pearson Edexcel 1CP2 Topic 3
Next unit: Networks and protocols Previous unit: Data representation
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