strata it training chapter 3 common input/output devices
TRANSCRIPT
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Strata IT Training
Chapter 3
Common Input/Output Devices
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Basic I/O Devices
• Keyboard• Mouse
– USB– Wireless
• Monitor– CRT– LCD (Flat Screen)
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Keyboards• Key usage can depend on application
– Games– Function keys
• QWERTY layout (first 6 letters of top row)– Originally designed to slow typing on manual
typewriters
• Connectors– Mini-DIN or PS/2 (purple)– USB– Wireless
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Keyboard Properties
• Open Control Panel• Switch to Small icon
view• Click Keyboard
– Change repeat delay and repeat rate
– Change Cursor blink rate
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Mouse• Right-click
– Get information
• Left-click– Select item
• Use Control Key and Shift key to select multiple
– Double-click • Advances to that selection
• Wheel– Scroll down window
• Middle-click– Wheel is also a button– Application dependent
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Mouse Connectors• Serial
– Really old– 9-pin connector
• PS/2 or Mini-DIN– Green plug
• USB – Type A• Wireless
– USB– Bluetooth
• Apple mice have one button
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Changing Mouse Operations
• Open Control Panel
• Switch to Small icon view
• Click Mouse
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Monitors
• CRT (Cathode Ray Tube)– Original monitor – Basically
TV Set– Power Hungry – Dangerous high voltage
• 30,000 volt capacitors
– Analog interface
• LCD (Liquid Crystal Display)– Flat Screen– Digital Interface– Lighter/Less Power– Wide aspect ratio
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LCD Display Types
Passive Matrix
• Each pixel must maintain its state passively, without being driven by circuitry.
• Lower cost• Difficult to view at angle
Active Matrix
• Each pixel is attached to a transistor and capacitor which actively maintain the pixel state while other pixels are being address
• Wider viewing angle• More cost
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Monitor Connectors• Video Card or
Motherboard– Video card for high speed
gaming
• VGA– 15-pin Analog -- CRTs
• DVI– Digital – LCD
• HDMI– TV and Computer video
• Devices may have multiple port types
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DVI Connectors
• The DVI connector has up to 29 pins and is given one of three names, depending on which signals it implements:– DVI-D (digital only, single link
or dual link)– DVI-A (analog only)– DVI-I (integrated, combines
digital and analog in the same connector; digital may be single or dual link)
– Dual link has 6 more pins for more bandwidth
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HDMI Connectors
• Carry both audio and video signals
• Connector types:– Type – A– Type – B– Type - C
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Monitor Properties
• Pixels– One point– Multiple color options
require storage bits
• Resolution– Pixels across X pixels
down– Higher resolution is
clearer, but smaller
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Resolutions
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Aspect Ratios
• The ratio between number of pixels in height and width of screen
• The most common aspect ratios used today in the presentation of films in movie theaters are 1.85:1 and 2.39:1– 640x480 = 4:3 or 1.33– 1900x1080 = 16:9 or 1.77
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Changing Monitor Properties• Right-click desktop• Left-click Personalize• Click Display• Click Adjust
Resolution• Set LCDs to max resolution
for best (clearest) results
• Orientation• If you have two
monitors attached– Select Extend
– Determine position
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End of Chapter 3 Presentation