1. Interacting with Your Computer
Peter Norton’s Introduction to Computers
Chapter 3
Interacting with Your Computer

2. Learning Objectives:
List at least three common input and output devices.
Name the processes a video monitor uses to displays images.
Name the components of a mouse and list the common techniques used to maintain a mouse.
Name three types of printers and list the advantages and disadvantages of each.
Explain how input and output devices communicate with the other parts of the computer.

3. Input Devices: Keyboard Mouse Trackball Trackpad Pen Touch Screen
Bar Code Reader
Image Scanner
Microphone
Video

4. When it gets sluggish, turn it over and remove the cover plate.
Right
click
The mouse is a fairly
intuitive input device.
Left
click
When it gets sluggish, turn it
over and remove the cover plate.
Carefully clean the ball and rollers.

5. Parts of a Keyboard: Alphanumeric Keys Modifier Keys Numeric Keypad
Function Keys
Cursor-movement Keys
Escape Key
Special-purpose Keys

7. Factors Affecting Monitors:
Size
Resolution
Refresh rate
Dot pitch

8. One complete set of scan lines is called a frame.
The picture is scanned
from left to right and
from top to bottom.
Size is measured
diagonally.
One complete set of scan
lines is called a frame.
Refresh rate = number of
frames in one second
1 pixel in a color monitor
Resolution = no. of pixels
(i.e x 768)

9. Flat-Panel Monitors: LCD (Liquid Crystal Display) Passive Matrix
Active Matrix
(Notebooks use LCD displays)

10. Types of Printers: Ink Jet Laser Dot-Matrix Thermal-Wax Dye-Sub Fiery
IRIS
Plotter

11. Ink jets are popular because of their
relatively low cost and color capability.

12. Laser printers are faster and capable of high resolution.
Heat roller bonds
toner to paper
Toner transferred
from drum to paper
Laser transfers
image to drum
Rotating
mirror
Laser beam
Paper is given a
static charge

13. Printer Criteria:
Image Quality
Speed
Initial Cost
Cost of Operation

14. Types of Interfaces:
Serial
Parallel
Centronics
SCSI

15. Serial data transmission is relatively slow!
UART
Receiver
RS232
Driver
Start bit
Stop Bit
Bit 6
Bit 3
Bit 1
Bit 2
Bit 4
Bit 7
Bit 0
Bit 5
To modem
Transmitter
Serial data transmission
is relatively slow!
Control
The serial ports transfer data one bit at a time.

16. The parallel port transfers data one byte at a time.
PIA
Receiver
Drivers
To printer
Transmitter
Control
The parallel port transfers data one byte at a time.

17. A SCSI card can be plugged into an expansion slot. SCSI
devices can be daisychained.

18. Learning Objectives: Chapter 3 Review
List at least three common input and output devices.
Name the processes a video monitor uses to displays images.
Name the components of a mouse and list the common techniques used to maintain a mouse.
Name three types of printers and list the advantages and disadvantages of each.
Explain how input and output devices communicate with the other parts of the computer.