1. Standard Input Devices

2. Objectives Identify the five key groups on a stand computer keyboard.
Name six special purpose keys found on all standard computer keyboards
List the five steps a computer follows when accepting input from a keyboard

3. Objectives (cont.)
Describe the purpose of a mouse and the role it plays in computing.
Identify the five essential techniques for using a mouse
Identify three common variants of the mouse

4. The Keyboard
The keyboard was one of the first peripherals to be used with computers, and it is still the primary input device for entering text and numbers. A standard keyboard includes about 100 keys; each key sends a different signal to the CPU
The skill of typing or Keyboarding, is the ability to enter text and numbers with skill and accuracy.

5. The Standard Keyboard Layout
The Alphanumeric Keys
The Modifier Keys
The Numeric Keypad
The Function Keys
The Cursor-Movement Keys
Special-Purpose Keys
Alphanumeric keys – the part of the keyboard that looks like a typewriter. - the letters are arranged the same way almost on every keyboard – sometimes called QWERTY because the first 6 key on the top row of letters or Q, W, E, R, T, Y.
The modifier keys modify the input of other keys (shift, crtl, alt)
The numeric keypad is usually located on the right side of the keyboard and looks like an adding machine. It features a Num Lock key the forces the numeric keys to input numbers.
The Function keys are arranged in a row along the top of the keyboard. There are usually function keys.
The cursor movement keys let you move around the screen without using the mouse.
There are 6 special purpose keys, each of which perform a special function.
Esc key – is used to back out one level
Print screen allows the user to capture whatever is shown on the screen as an image
Scroll lock causes the cursor to remain stationery
The Pause key can be used to stop a command in progress
Insert key switches cursor to Overtype mode
Delete removes character to the right of the cursor
In 1996 nearly all IBM-compatible keyboards added two additional keys
The start with has the windows logo
The shortcut which opens and on screen menu

6. Ergonomic and Specialty Keyboards
Ergonomically designed keyboards enable the user’s hands to remained positioned correctly on the keyboard while reducing bending and strain.

7. How the Computer Accepts Input from the Keyboard
Keyboard controller
Keyboard buffer
Scan code
Interrupt request
Repeat rate
A key is pressed on the keyboard
The keyboard controller sends the scan code for the key to the keyboard buffer
The keyboard controller sends an interrupt request to the system software
The system software responds to the interrupt by reading the scan code from the keyboard buffer
The system software passes the scan code to the CPU
The repeat rate determines how long you must hold down an alphanumeric key before the keyboard will repeat the character and how rapidly the character is retype while you press the key.

8. Self check
The _____________ keyboard layout is so called because of the location of the first six keys in the top row of letter keys
The ________ key works as part of the alphanumeric keys but also functions as a modifier key.
When you press a key on the keyboard, a(n) ___________ tells the computer which key you pressed.
QWERTY
Shift
scan code

9. The Mouse
A personal computer purchased in the 1980’s probably included a keyboard as the only input device.
Today, most PC’s include a pointing device

10. Mouse Terms Mouse Pointer Optical mouse
A mouse is an input device that rolls around a flat surface and controls the pointer.
The pointer is an on-screen object that is used to select text, access menus and interact with programs, files or data that appear on the screen
Most mouse are mechanical: they contain a small rubber ball that protrudes through a hole in the bottom of the mouse’s case.
Another type of mouse is the optical mouse. This nonmechanical mouse emits a beam of light from its underside; it uses the light’s reflection to judge the distance direction and speed of its travel

11. Using the Mouse Pointing Clicking Double-clicking Dragging
Right-clicking

12. Variants of the Mouse The Trackball The Trackpad
Pointers in the Keyboard

13. Please complete the following:
Key Term Questions
Multiple Choice
Review Questions
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