What is a computer?
A machine or device that receives data , processes information and outputs results of assigned tasks
What can a computer do?
- store large amounts of data
- carry out many different tasks
- work for a long period of time
- with stable quality
- with height speed & accuracy
Desktop Computer definition
- used in our daily life
- usually at home or office
Laptop computer definition
- all-in-one computer
- widely used in the education sector / business sector / personal entertainment
Tablet definition
- portable
- w touchscreen
Smartphone definition
- mobile device
- w touchscreen / internet access / operating system
POS ? Definition
- Point-of-sale terminal
- includes a screen / barcode scanner / printer / card reader / keyboard
- used in stores to process card payment
ATM ? Definition
- Automated teller machine
- provides different bank services
- cash withdrawal / bill payment / money transfer
1936 ?
- Alan Turing-> Turing machine
1953 ?
- IBM 701 -> 1st commercial scientific computer
- used to aid the United Nations in Korean War
1958?
- Jack Kilby -> introduced ‘ integrated circuit ‘ (computer chip )
1971?
- Intel introduced the 1st microprocessor
1981?
IBM -> 1st personal computer
1984 ?
- Apple -> 1st personal com w GUI / pointing device,Macintosh
2002?
1st tablet
2010?
Ipad
Is calculator a computer?
Yes
What is I-P-O ?
- Input -> process -> output
- three stages of computer operation
Main component of computer?
CPU, power supply, motherboard, storage devices
CPU? Definition
- Central Processing Unit
- brain of computer
- consists many electronic & logic circuits to perform logical operations
- major manufacturers->Intel , AMD
Motherboard? Definition
-main circuit board
- holds many important components
( CPU, main memory, display card, input/output connection interface , network interface )
Power supply ? Definition
- electronic device that supplies electric power of different voltage to main components
- generates a lot of heat during operation, has a fan for cooling down
Storage devices ? Definition
- for keeping data
- Eg. Hard disk , SSD , RAM
What is CPU responsible for ?
Fetching , interpreting , executing the instructions of computer programs
