Download presentation
Presentation is loading. Please wait.
Published byHoward Patrick Modified over 9 years ago
1
The Computer System CS 103: Computers and Application Software
2
Computer Definition An electronic device that accepts data, processes it, and produces information Input-->Process-->Output Hardware System Software System
3
Hardware System Secondary Storage Central Processing Unit Main Memory Input Device Output Device
4
Hardware System CPU central processing unit ALU and Control Unit Main Memory RAM (random-access memory) -- stores program and data (temporary) ROM (read-only memory) -- stores basic instructions to the computer (permanent) Input Device keyboard, mouse, light pen, disk Output Device monitor screen, printer, disk
5
Central Processor Unit (CPU) Computer’s brain Computer’s brain Execute instructions—e.g., add, subtract, compare for equality Speed 500 Mhz—500 million instructions per second 1 Ghz—1 billion instructions per second
6
Main Memory Contains Program statements to be executed Data to be processed RAM Transient E.g., application programs 512 MB, 1 GB, 2GB ROM Permanent Preinstalled E.g., program to accept keyboard input, to print to screen, to execute statements
7
Motherboard
8
External Storage Diskette Diskette Hard Disk Hard Disk CD-ROM CD-ROM DVD DVD USB Flash Drive (pen drive, key drive, USB drive) USB Flash Drive (pen drive, key drive, USB drive) Tape Tape
9
Units of Storage Units of storage 1 Bit (smallest unit of data) 1 Byte = 8 bits (one character) 1 Kilobyte (1000x) 2 10 =1024 1 Megabyte (1,000,000x) 2 20 =1,024,000 1 Gigabyte (1,000,000,000x) 2 30 =1,024,000,000 1 Terrabyte (1,000,000,000,000x) Storage size Floppy diskette (1.4 MB) CD (600 MB) DVD (4.7 GB Flash memory (200 MB – 4 GB)
10
Software System Application Programs Word processor Spreadsheet Database Management Systems Games Operating Systems Windows 3.1, 95, 97, 2000, NT Apple Unix, Linux Programming Language Translators C++ Compiler Java Translater
11
Network System Local Area Network (LAN) Collection of computers connected together in a limited area to share recourses Share files, programs, printers Internet World-wide network of computer networks World Wide Web Collection of Web sites that uses the Internet
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.