Computer Prepare Test

GUI is a graphical user interface that came into 1995 to make computers easier to use by everyone (windows 95 was the first GUI). GUI makes windowed applications

used by many organizations like doctors offices, etc. OLDEST

used to host programs and data for small network

• 1. vacuum tube - oldest
• 2. transister - newest
• 3. I.C (integrated circuits ) - current

performed specifically for that product

cost 4-5 millions, only government uses it

central processing unit where date fets processed

• input - entering data into the computer
• processing - performing operations on the data
• output - presenting the results (what you see on your screen)

• input - mouse, keyboard
• processing - CPU
• output - monitor or computer screen

• Primary - hard drive of computer (feed drive)..internal, fixed, main computer hard drive
• Secondary - flash drive...mobile, not fixed

all the physical hard drives that make up the computer (ex. mouse, printer, monitor, keyboard, etc)

data is raw number and information is the data

an internet proticol address designed to every device that is on the internet

internet service provider that is a computer that provides you with internet service like verizon, at&t, comcast, etc.

aplication and system

the computers we use

a numbering system that is digital. 2 numbers in this system - decimal system

8 bits equal 1 byte. each letter is one bit.

language that the machine uses

• KB - kilobytes-thousand
• MB - megabytes-million
• GB - gigabytes-billion
• TB - tarabytes-trillion

Computer Processing Unit-Arithmatic Logical Unit - does all the calculations

RAM - random access memory that is the higher, faster computer functions. everything used on computer takes their own individual share on RAM.

ROM - read only memory that is fixed and permanent, hard coded in computer. any problem with ROM, your computer is crashing

Ports - stocket that is found on back of computer where you plug things in

• 3 types....
• Serial - hole that has room for only 1 pin (mouse, mic, headphones, etc)
• Parallel - a lot of tiny holes in it to be used for devices that send alot of instruction at same time (printer, monitor)
• USB - flashdrive..low cost, high speed

• device - secondary storage
• drive - where you insert the secondary storage

corporations/company's store elseware as backup incase something happens

• random - access in random order
• direct - can choose in what # order you want

• floppy - physical and compatability is low
• flash - physical and compatability is high
• CD - physical is low and compatability is high
• DVD - physical is low and compatability is high

• Cluster - whatever you save goes to a cluster
• Sector - group of clusters

Note: every sector has a lot of clusters in it

random array of independent disk that break data and put on different harddrives

digital camera

• CD-R: Reading and memory - cannot delete or edit
• CD-RW: read and writing - can edit and delete

Input Device - convert data from hyman understandable form to computer understandable form

Output Device - convert data from computer understandable form to human understandable form

Standard Keyboard - what we use everyday

Ergonomic keyboard - bigger keyboard demicircle shape friendlier and safer for hands

Wireless keyboard - no wires needed

• standard mouse
• mousepad
• mechanical mouse (old-style with a rolling ball)
• optical mouse - laster at bottom
• wireless mouse

• OCR - optical character pecandinitia
• MICR - magnetic in character recondition

Mechanical (old) and Flatbed (current)

CRT - catahode ray tube (an older type) that spray image on screen and is heavy in weight

LCD - liquid crystal display wih best quality (newer). picture quality does not matter. (LED, LCD, plasma)

diagonally

• flat screen - screen flat, back is not
• flat panal - whole thing is flat

• 8 jet printer (oldest) - not good print quality
• laser (newest) - last a long time
• inkjet - good quality
• photo printer

system which converts human voice into a computer (note: windows 7 has it now)

• 1. graphics
• 2. audio
• 3. video

hyper text markup language

used in creation of websites - works well with multimedia

wireless markup language used for creating websites for small divices like cellphones

starts up computer

command-line interface, which is a text prompt in which you can enter specific commands to be executed

• hardrive - C
• floppy - A (B is with more than 1 floppy)
• CD-ROM/DVD - D or E
• USB - F and above

• sequential - stored at random locations
• direct - stored at sequential locations