Complete the table by writing the missing CPU component/register name or description for each of the numbered blank spaces [1] to [4].
| CPU component or register | Description / Function |
|---|---|
| [ 1 ] | Holds the memory address of the next instruction to be fetched from primary memory. |
| Current Instruction Register (CIR) | [ 2 ] |
| [ 3 ] | Carries out arithmetic calculations and logical operations. |
| Accumulator (ACC) | [ 4 ] |
12 exam-style questions on OCR GCSE Computer Science Architecture of the CPU. Each one has a worked solution and a mark scheme showing where the marks go.