Read the revision notes one at a time, with a quick check after each one. Get one wrong and you can look back at the note and try again, then there's a final round of the ones you missed.
Central Processing Unit
Stored Program Computers
Von Neumann Architecture
Registers
Control Unit
Arithmetic Logic Unit
Program Counter
Memory Address Register
Memory Data Register
Accumulator
Cache and performance
The Fetch Decode Execute Cycle
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