Computers use the Fetch-Decode-Execute cycle to process instructions.
Complete the table by writing the numbers 1 to 4 in the 'Sequence number' column to put the stages of the cycle in the correct chronological order (where 1 is the first stage and 4 is the last stage).
| Stage | Sequence number |
|---|---|
| The Control Unit (CU) decodes the instruction | |
| The instruction is fetched from memory using the address bus | |
| The Program Counter (PC) holds the address of the next instruction to be fetched | |
| The instruction is executed, such as performing a calculation in the ALU |
11 exam-style questions on Edexcel IGCSE Computer Science Machines and computational modelling. Each one has a worked solution and a mark scheme showing where the marks go.