Exercise 2

COMPUTER SYSTEM- is a combinatin of software and hardware

---HARDWARE---

__CPU- Central Processing Unit__ The processor chip that runs your computer.

__RAM- Random Access Memory__ The part of the computer that temporarily holds a program and related files and manipulates data (non permanent).

---PERIPHERALS---

INPUT DEVICES

__Keyboard__ Keyboards are designed for the input of text and characters and also to control the operation of a computer.

__Mouse__ A mouse functions as a pointing device by detecting two-dimensional motion relative to its supporting surface. Physically, a mouse consists of a small case, held under one of the user's hands, with one or more buttons.

__Scanner__ Scanner is a device that analyzes images, printed text, or handwriting, or an object (such as an ornament) and converts it to a digital image. Most scanners today are variations of the desktop (or flatbed) scanner.

OUTPUT DEVICES

__Monitor__ Monitor is a piece of electrical equipment which displays viewable images generated by a computer without producing a permanent record.

__Printer__ Printer produces a hard copy (permanent human-readable text and/or graphics) of documents stored in electronic form, usually on physical print media such as paper or transparencies.

__Speakers__ Speakers are external speakers, commonly equipped with a low-power internal amplifier. The standard audio connection is a 3.5mm (1/8 inch) stereo jack plug often colour-coded lime green, following the PC 99 standard) for computer sound cards.

STORAGE DEVICES

__Hard Drive__ Hard drive a non-volatile storage device which stores digitally encoded data on rapidly rotating platters with magnetic surfaces.

__Floppy Drive__

__Zip Drive__ Zip drive is a medium-capacity removable disk storage system, introduced by Iomega in late 1994. Originally it had a capacity of 100 MB, but later versions increased this to first 250 MB and then 750 MB.

__CD-ROM__ CD-ROM is a Compact Disc that contains data accessible by a computer. While the Compact Disc format was originally designed for music storage and playback, the format was later adapted to hold any form of binary data. CD-ROMs are popularly used to distribute computer software, including games and multimedia applications, though any data can be stored (up to the capacity limit of a disc).