1. Dr. Walaa Nasr

2.  By the end of this lecture the students will be able to identify :  Computer system  Hardware and its contents  Software  Networks and its types  Criteria for selection of computer equipment  Roles of support personnel

5. Key Board Scanner Microphone Digital Camera Barcode Reader Mouse

6. Hard Drive Processor Chip (CPU) Memory Optical Disc Drive Power Supply

10. Printer Headsets Data Projector Speakers Monitor

11.  The computer has both primary and secondary storage spaces. 1) Primary storage devices – Memory. 2) Secondary storage devices : 1.Hard disk: - Internal hard drive. - External hard drive. 2. CD/DVDs. 3. USB. 4. SD Card. 5. Floppy disk.

12. Internal hard drive. CD/DVD USB Floppy disk External hard drive. SD Card.

13. 700 floppy disks = 1 GB Flash Drive

14. Processor Memory Hard drive Processor speed is measured by : *Hertz. Memory capacity is measured in: * byte. Hard disk capacity is measured in: * byte. * Kilo (K), Mega (M), Giga (G)……

15.  Software programs consist of step-by-step instructions that direct the computer hardware to perform specific tasks such as multiplying, dividing or delivering data.

16. Supercomputer Mainframe computer Desktop computer Server Mini computers

17. Laptop Handheld computer Personal Digital Assistant iPhone Black Berry

18.  A network is "a combination of hardware and software that allows communication and electronic transfer of information between computers"

19.  Home Networks - within a home  Local Area Networks (LAN) - networks within an area, location or business. The University connects all its computers on a LAN.

20.  Wide Area Networks (WAN) - several LAN connected together  Internet - many WAN connected together around the globe to give us the Internet that we use today

21. When selecting a computer system or related hardware, you must take into consideration the following: 1. The types of applications required. Some people need word processing, while others may need database or spread sheet software.

22. 2. The program execution time and computer capacity needed to process jobs. Complex jobs require more processor speed and memory.

23. 3. Storage Capacity: Needs are determined by the amount of information that must be kept and the length of time that it must be retained. 4. Backup options: When information is critical to conduct daily business, another backup system may be need if the primary one fails.

24.  Support for computer systems and networks is extremely important in order to maintain system functionality The role of support personnel include:  1) User must have education and training.  2) Able to make installation and upgrading for operating systems and various applications  3) Be troubleshooting