1. Stores the OS/data currently in use and software currently in use Memory Unit 21

2. Data is processed instantly. System responds instantly to changes in input Real Time Operating System 14

3. the user communicates with the computer in a human conversation type way Natural Language Interface 15

4. Stores the data being transferred to or from memory Memory Data Register 13

5. allows one user at a time to use the system. It allocates each user with rights and keeps the user files separate Single User Operating System 6

6. Route reserved before transmission. Establishes a route along which to send data. Data sent down this route in its entirety. Can tie up large areas of network. Circuit Switching 28

7. Identification about where the data is being sent/coming from Address Bus 111

8. network covering a single building or site LANLAN 5

9. Multiple bits transmitted at a time down many wires. Parallel Transmission 2

10. A set of rules that governs communication between devices ProtocolProtocol 18

11. Input device that detects physical quantities SensorSensor 12

12. That number is looked up on a database. If number is not on database then it must have been incorrectly inputted. Existence Check 8

13. Characters shapes are scanned and these shapes are turned into text Optical Character Recognition 9

14. Data is put onto long term storage and kept offline so that it can be referred to if necessary. Data is still available without taking up space on working storage. ArchiveArchive 33

15. Controls fetch/execute cycle. Manages execution of instructions by using control signals to other parts of computer. Synchronises actions (using inbuilt clock). Control Unit 16

16. Stores results of calculations performed AccumulatorAccumulator 25

17. Contains startup program. Cannot be changed RomRom 7

18. Communication in both directions simultaneously DuplexDuplex 17

19. Stores the address of the next instruction and controls the sequence in which the instructions are executed. Program Counter 22

20. hardware that is used to put data into a computer Input Device 1

21. A digit on the end of a string of numbers that has been calculated based on an algorithm performed on the string of numbers. Check Digit 24

22. Stores the instruction currently being executed Current Instruction Register 30

23. hardware to display information from a computer Output Device 10

24. One bit transmitted at a time down a single wire Serial Transmission 34

25. copy of a file and its structure on a portable medium kept away from originals so that if the original is corrupted it can be replaced. Important files needs be protected from deliberate or accidental data loss. BackupBackup 19

26. Send control signals from control unit to other parts of the processor Control Bus 27

27. Connects LAN to a WAN RouterRouter 23

28. Acts as a gateway to processor. Arithmetic Logic Unit 3

29. Communication in one direction only SimplexSimplex 20

30. Peripheral that allows storage of data over a long period of time Secondary Storage Device 4

31. Communication in both directions but one at a time Half Duplex 26

32. Checking input data with original data to ensure there have been no input errors VerificationVerification 29

33. Transmit data between areas of the processor Data Bus 31

34. Ensures data meets certain rules. These are programmed in the software. ValidationValidation 32