CIS 251 – Lesson 2 Essential Computer Concepts Rod Rodrigues.

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Presentation transcript:

CIS 251 – Lesson 2 Essential Computer Concepts Rod Rodrigues

Types of Computers Personal Computers or PCs Handheld Computer or PDA Large Business Computers –Midrange –Mainframe –Supercomputer

Interface An Interface is the way in which the computer’s basic system interacts with the user. Mainframe text-based –copy myfile.bas f:\ Windows or Mac GUI –Click and drag files

How Computers Represent Data In order for information to flow through a computer system in a form suitable for processing all symbols, pictures or words must be reduced to a string of binary digits.

bytes bits

ASCII Code and Unicode These are mappings between binary codes and characters of the alphabets of different languages. the ASCII code for “A” is 65, or ASCII Chinese: over 2,000 symbols. Unicode blows the lid off of the ability to represent World Languages by computer.

A Typical System

CPUs and Microprocessors Microprocessors integrate all of the memory, logic and control circuits for an entire CPU on a single chip ROM

Volatile Storage RAM storage has three functions –Stores all or part of the program that is being executed –Stores the operating system programs that manage the operation of the computer –Holds the data that the program is using

Secondary Storage Floppy Disks or diskettes, Hard disk, ZIP disk, CDs (CD, CD-R, CD-RW, DVD, DVD-R, DVD- RW, USB drive

Magnetic Tape An older storage technology that is still employed for secondary storage of large volumes of information Older reel-to-reel

Data Communications The transmission of text, numeric, voice, or video data from one computer to another Protocol is a set of rules, or language Analog and Digital

Modem

Networking

Computer Software System Software Application Software

A Reminder WebCT –All should occur through WebCT me using WebCT and NOT my school or home address I will ALWAYS you through WebCT –ONLY IF WEBCT is NOT FUNCTIONING, may you me using and I will use the address you supplied when you signed up for WebCT –Logon to WebCT to check for announcements and DAILY

The End