Basic TechnologyComponentsKeyboarding8.26.14

A) monitorB) keyboardC) CPUD) printer

A) monitorB) keyboardC) CPUD) mouse

A) monitorB) keyboardC) CPUD) printer

A) monitorB) keyboardC) CPUD) printer

A) monitorB) keyboardC) CD-Rom DriveD) printer

A) monitorB) speakersC) CPUD) printer

A) monitorB) keyboardC) CPUD) floppy drive

A) floppy disksB) CDsC) monitorD) printer

A) floppy diskB) CD-ROMC) monitorD) printer

A) scannerB) speakersC) monitorD) printer

A) floppy diskB) CD-ROMC) monitorD) printer

A) scannerB) digital cameraC) monitorD) printer

A) floppy diskB) CD-ROMC) MP3 playerD) scanner

A) floppy diskB) microphoneC) headphonesD) mouse

A) floppy diskB) microphoneC) headphonesD) mouse

The Actual Computer • Your "computer" is a

collection of devices that function as a unit.

• The most basic collection includes:• Computer CPU• Monitor• Keyboard• Mouse.

• The Computer CPU is normally:• a rectangular box that sits on

your desktop (called a "Desktop Case") or next to your knee under the desk (called a "Tower Case").

• The computer's CPU is:• actually a small electronic

device inside the case

The Monitor • The Computer Monitor:

• is the computer user's window into the workings of the computer.

• It consists of a television picture tube that had been modified to accept the type of video signal created by the computer's electronics.

The Keyboard • The Keyboard is:

• the primary input device used to communicate with the computer.

• A computer keyboard closely resembles a conventional typewriter keyboard with the addition of numerous keys that are used specifically for computing functions.

The Mouse• Named for the

resemblance of the wire coming out of it and a mouse's tail

• The mouse was introduced to computing in the early 1980's

• The mouse is:• another input device used to

point at objects on the computer monitor and select them.

The Floppy Diskette Drive• Uses a temporary storage

containers or transportation media for data.

• A standard floppy diskette can hold 1.44 MB of computer data.

• Computer diskettes are:• Not as reliable or fast as the

internal storage drives on the computer.

• They are also the primary vector of virus infection in the computer world.

The CD-ROM Drive• Gained prominence in the

late 1980's• The disk is read with an

optical laser • Most disks of this kind are

"Read Only" meaning:• that the computer can

retrieve information from the disk, but cannot place information on it (CD-R)

• New developments have improved this technology to allow writing and rewriting data to the disk (CD-RW)

Computer Peripherals• Computer peripherals (device

that works in conjunction with a computer) are any electronic devices that:• can be hooked up to a

computer other than the standard input-output devices (monitor, keyboard, mouse).

• Peripheral devices include:• speakers, microphones,

printers, scanners, digital cameras, plotters, and modems.

• Peripherals often require special software packages called "drivers". • These drivers are usually

included with the peripheral at purchase time.

Input: Keyboard• The layout of the keys was:

• borrowed from the typewriter with a number of new keys added.

• Various keyboards have different extra keys.

• A keyboard for a Windows computer has different extra keys than one for an Apple computer.

• Laptop computers have:• fewer keys, but have an

additional Fn key (functions key), that can be combined with other keys to replace the missing keys.

• Keyboards can be customized for other languages, too.

Escape

• Cancels actions in progress before they finish.

Function keys:• These keys are numbered

F1, F2, F3,....F12. • These are programmable

keys. • That is, programs can

assign actions to these keys. • So the same key might

produce different results in different programs.

• Some of the function keys are becoming more standardized as to what they do. For example, F1 is most often used to access the Help file for a program.

Numbers row:• Two characters on each key,

one at the top of the key and one at the bottom or side. • The upper character is a symbol

and is accessed by holding the SHIFT key down while pressing the key.

• Numbers can also be typed from the Numeric Keypad.

• The Backslash key does not have a standard position on the keyboard. • Sometimes you will find it at the

end of the number keys, before the Backspace key.

• Sometimes it is above a rectangular Enter key. Or it may be to the left of the Enter key.

Alphabet Letters• The alphabet letters and some

punctuation marks are in three rows.

• QWERTY: This arrangement of the letters was inherited from the typewriter. • The name comes from the order of the

letters on the first row of alphabet characters.

• It is not the most efficient layout.• With the first typewriters, the typists

had trouble with the mechanical keys jamming each other because the typists could strike the keys faster than the keys could get out of each others' way. So the letters were arranged to slow down the typists' speed.

• Computer keyboards do not have mechanical keys, so a more efficient layout could be used. But so many people are familiar and skilled with the old way that it does not seem likely that the layout will change.

Navigation Keys, Insert & Delete

• Delete: Erases the character just to the right of the cursor. • Any text beyond the erased character

is moved to the left.

• Home: Navigation key. • Moves the cursor to the beginning of

the current line.

• End: Navigation key. • Moves the cursor to the end of the

current line.

• Page Up: Navigation key. • Moves the cursor up the displayed

area one screen's worth.

• Page Down: Navigation key. • Drops the displayed area down the

page one screen's worth.

Arrow keys:• Arrow keys: These four

keys are used to move the cursor on the screen. • In a text document:

• the up and down arrows move the cursor up or down one line.

• The left and right arrows move the cursor one character sideways.

• In a spreadsheet:• the arrow keys move the

cursor up or down a row, left or right a column.

Numeric Keypad• When Num Lock is on, the number

keys on the numeric keypad respond as numbers.

• Other buttons on the numeric keypad type symbols for arithmetic operations, + add, - subtract, * multiply, / divide and a decimal point.

• The ENTER key behaves like the ENTER key beside the alphabet keys.

• In a spreadsheet, you can actually do arithmetic with these keys. • Example: Type =1+2+3 in a cell and then

press ENTER. The cell will show the total, 6.

• In a word processing document, you are just typing in the symbols. They won't add up.

• When Num lock is off, the number keys are navigation keys, using the alternate markings on the keys.

Caps Lock• When the Caps Lock key

is on, pressing any alphabetic key will result in an upper case (capital) letter. • The number and symbol

keys are not affected, however.

Shift• Used in combination with

the alphabetic keys to get upper case letters, one at a time, or with number keys to get the upper symbol on the key. • You can turn on Caps Lock

when you want a lot of capital letters to save holding the Shift key down for a long time.

• With a numeric/symbol key, using the Shift key will produce the character at the top of the key.

Bottom row of keys• The CTRL (Control) key

does nothing all by itself. • It must be pressed in

combination with other keys.

• When used in combination, the Control key changes the normal effect of a key.

• The Windows key opens the Windows Start menu. • It can be combined with

other keys, like Win + M minimizes all windows.

• The ALT (Alternate ) key doesn't do anything by itself.

• But if you hold it down while pressing another key, the effect of that key may be different from usual.

Bottom row of keys• The Spacebar is used to enter

blank spaces in text. • Sometimes it can also be used

instead of a mouse click on buttons.

• The Context Menu key opens the right-click context menu for whatever you have selected.

• Laptops and keyboards for other languages often have an additional key for combining with other keys, labeled Fn for 'function'. • This key is usually on the left or

right side of the left side CTRL key and its label is usually in a different color.

• It is sometimes at the top left of a very small keyboard.

Screen control keys• The Print Screen key is the only

one of these three keys that is widely used these days. • Under Windows, pressing the Print

Screen key sends a copy of the screen to the Clipboard.

• You must then paste to an appropriate program and print from there.

• The Scroll Lock key is more useful under the disk operating system where pressing it will stop text on the screen from scrolling off the top of the screen.• This gives you time to read or print it

before continuing.

• The Pause/Break key is little used under Windows. Under the disk operating system it is used to pause actions in progress.

QUIZ ON FRIDAY 8.29.14QUIZ ON FRIDAY 8.29.14