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Welcome students, I look forward to working with you this semester, check this site frequently for updates and assignments.
~ JON ~
| Chapter 3 Notes |
| Chapter 4 Notes |
| Chapter 5 Notes |
| Chapter 6 Notes |
| Chapter 7 Notes |
| Chapter 8 Notes |
| Chapter 9 Notes |
| Port Identification |
~ IST ~
· Hardware components
o System Unit
§ Tower/processing unit
· Ram, hard drive (inturnal), Processor, Motherboard, ect
o Peripheral Devices
§ Monitor, printer, router, mouse, scanner, ect.
· Together the system unit and peripheral devices perform four main functions: they enable the computer to input data, process that data, and output and store the data and information.
· Input devices
o Devices used to enter information or instructions into the computer
§ Keyboard
· The QWERTY keyboard is standard on most PCs
o
· Enhanced features include number, function and navigation keys.
· Dvorak Keyboard - Puts the most commonly used keys at “home keys” Reduces distance of finger stretches
o
· Specialty Keyboards: Laptops, PDAs, Wireless, Ergonomic, Gaming, cell phone key pads
·
§ Mouse / pointing device
· Rollerball mouse - Less expensive, Harder to keep clean
· Trackball - Harder to control, Stationary on desk
· Optical mouse, Needs no mouse pad, Doesn’t need cleaning, More expensive
· Game pads - Buttons and pointing devices
§ Microphone
§ Scanner
§ Digital camera, ect
· Output devices
o Softcopy (video, sounds, control signals)
o Hardcopy (print)
o Monitors
§ CRT Cathode Ray Tube
· Less expensive
· Use much more space
· Uses more energy
· Better viewing angles
· Uses picture tube technology
· Screen size – Diagonal measurement of the screen (15, 17, 19, 21)
· Resolution – Sharpness of the image determined by the number pixels that the screen can display (800 x 600, 1024 x 768, 1600 x 1200)
· Refresh rate – Speed at which the screen is refreshed (60Hz, 75Hz) Faster rate equals less flicker.
§ LCD Liquid Crystal Display
· More expensive
· Uses far less space
· More energy efficient
· Less viewable from an angle
· Liquid crystal sandwiched between two transparent layers form images
· Used for notebook computers, PDAs, cellular phones, and personal computers
§ Touch-screen monitors double as both input and output devices.
§ Data projectors project a computer image to a large screen for sharing with large groups.
o Printers
§ Impact printers
· Dot-matrix
§ Nonimpact printers
· Inkjet
· Laser
· Multifunction
§ Specialty printers
· Plotters
· Thermal printers
o Sound Output
§ Headphones
§ Speakers
· System unit
o Box that contains the central electronic components of the computer:
§
CPU/RAM/
motherboard
§ Expansion cards
§ Power supply
§ Storage devices
o Types of ports:
§ Serial
§ Parallel
§ VGA
§ USB
§ Connectivity
· Ethernet
· Modem
o Essential electronic components used to process data
§ Power supply
§ Hard disk drive
· Stores data and program instructions
· Permanent (nonvolatile) storage
· Storage capacities up to 250 GB and higher
· Transfers data in milliseconds
§ Motherboard
§ CPU
· Referred to as the “brains” of the computer
· Controls all functions of the computer
· Processes all commands and instructions
· Can perform billions of tasks per second
§ Expansion cards
· Adds functions
· Provides new connections for peripheral devices
· Common types:
o Sound
o Modem
o Video (VGA)
o Network (NIC)
§ Random access memory (RAM)
· Primary storage
· Stores instructions and data
· Temporary (volatile) storage
· Operates in nanoseconds
· Ergonomics
o Ergonomics refers to minimizing injury or discomfort while using the computer
§ Steps to follow:
· Position monitor correctly
· Use adjustable chair
· Assume proper position while typing
· Take breaks
· Ensure adequate lighting