Introduction to computer systems

3. IPO - Input, Process, Output INPUT PROCESS OUTPUT Data is INPUT into the computer system It is then PROCESSED to produce useful Information as OUTPUT .

6. Hardware Devices

8. Input Devices

12. Touch Screen A touch screen can detect exactly where, on its surface it has been touched. Touch screens are used in a lot of fast food chains and restaurants because they are easy to keep clean and re-program if changes need to be made to the menu.

19. Output Devices

24. Backing Storage Devices

38. Monitor- Output Printer- Output Central Processing Unit Mouse- Input Keyboard- Input A Computer System ?

47. Bus Network What would happen to the network if a workstation breaks down? X

49. Ring Network What would happen to the network if a workstation breaks down? X Advantage: all nodes can access the Token equally, high speed. Disadvantage: all on one path, therefore maintenance is high for faults and failures.

50. Star Network Data is controlled by a central server, messages sent and received are read by the controller. Each workstation has Its own dedicated link. Advantages: fast with high volumes of data, extra nodes added without any disconnections. Central Controller Node Workstations

51. Star Network What would happen to the network if a workstation breaks down? X Disadvantages: if the Central controller fails the whole system is down, large amounts of cable are required, so it may get expensive.

52. Mesh Network Data sent from node to node goes by a direct link. Possible to leave out some paths as there are many alternative routes. Advantages: very fast, and fault tolerant. Disadvantages: very large amounts of cabling, resulting In higher maintenance costs.

53. Mesh Network What would happen to the network if a workstation breaks down? X