PCT

1. DCE1243 - Introduction to PC Troubleshooting The objective is to introduce the main concepts associated with the assembling , installation , troubleshooting , and preventive maintenance of modern personal computer

4. Introduction to computer

9. History of Computer 1801 the Frenchman Joseph Marie Jacquard Invented – (remember the "hanging chad" from the Florida presidential ballots of the year 2000)

10. History of Computer Generation Year Descriptions 1 st 1940 – 1956 Vacuum Tubes – for circuitry and magnetic drums for memory  machine language to perform operations 2 nd 1956 – 1963 Transistor – replaced vacuum tubes, it is a device composed of semiconductor material that amplifies a signal or opens or closes a circuit 3 rd 1964 – 1971 Integrated Circuits – with transistors, resistors, and capacitors were etched onto a piece of silicon, called semiconductors, increased the speed and efficiency of computers 4 th 1971 – Present Microprocessors – widely used and most the wanted chips 5 th Present & Beyond Artificial Intelligence – making computer to behave like humans

12. Electronic Communication Computer uses binary notation to communicate Binary notation use 2 bit 0 and 1( 0 represent no signal off , 1 represent a signal on )

14. Communications Devices Modem Network Interface Card – NIC

15. Binary Math Term Memory Unit Value Bit Smallest unit of information, shorthand term for binary digit Nibble 4 bits (Half of a byte) Byte 8 bits (Equal to one character) Word 16 bits on most personal computers (longer words possible on larger computers) Kilobyte (KB) 1024 bytes Megabyte (MB) 1,048,576 bytes (Approximately one million bytes or 1024 KB) Gigabyte (GB) 1,073,741,824 bytes (Approximately one billion bytes or 1024 MB)

16. ASCII Code The standard code for handling text characters on most modern computers is called ASCII (American Standard Code for Information Interchange). The basic ASCII standard consists of 128 codes representing the English alphabet, punctuation, and certain control characters Most systems today recognize 256 codes: the original 128, plus an additional 128 codes called the extended character set

17. ASCII Code

18. EBCDIC Extended Binary Coded Decimal Interchange Code ( EBCDIC ) is an 8-bit character encoding Used on IBM mainframe operating system such as z/OS,OS/390,VM and VSE as well as IBM midrange computer operating systems such as OS/400 and i5/OS

24. Input Devices Keyboard Mouse – pointing device Microphone – speech-recognition Digital Cameras

26. Processing Devices Motherboard Central Processing Unit – CPU Random Access Memory– RAM Expansion Card

28. Output Devices Monitor Printer Speakers

30. Storage Devices Hard Drive Floppy Disk Drive Zip Drive CD/DVD Drive Jaz Drive Tape Drive Micro Drive

32. Types of Computers: Computers for Individuals Desktop – PC, iMac Notebook – Laptop Workstation Personal Digital Assistant Internet Appliance All-in-One