Computer Hardware

3. holds the memory address of the next instruction to be fetched, incrementing by 1 each time
5. used to speed up the clock and processing power of a computer
6. carries the instructions
12. temporarily stores data being fetched from or written to the CPU's main memory
14. stores all programs and data temporarily while they are in use

1. stores results of calculations performed by the ALU
2. processes all data and instructions given by the user
4. controls and co-ordinates the activities of the computer
7. stores the instruction used to boot up the computer OS
8. controls the timing of the processor
9. memory which is volatile
10. causes the next instruction and any data involved to be fetched from main memory
11. decodes the instruction to be carried out
13. performs logic and arithmetic instructions
15. type of memory that stores frequently used instructions, programs and data