Input, Output and Storage

Input, Output and Storage

1. Input and Output Devices

   • Input
     • Barcode Readers
       • Pen-Type Readers
         • Simple
         • Durable
           • Tightly sealed against hazards
         • Limited applications
           • Direct contact with barcode
         • Portable computers
           • Small
           • Low weight
       • Laser Scanners
         • Reliable
         • Economical
         • Supermarkets
         • Variety of forms
       • Camera-Based Readers
         • Read barcode on any surface
           • Read damaged barcodes
         • Age verification
         • Coupons
         • Event tickets
         • Scan QR code with mobile
           • DVD catalogues
           • Play MP3
           • Nutrition information
     • Digital Cameras
       • CCD sensor
         • High quality images
         • Reliable
       • CMOS sensor
         • 100 times less power consumption
     • Radio Frequency Identification
       • Tags read without line of sight
       • Tracker
         • Household products
         • Cars
         • Bank cards
         • Animals
       • Active Tags
         • Larger
         • Battery needed
         • Track things read from further away
       • Passive Tags
         • Cheaper
         • No battery
         • Tagging items
   • Output
     • Screens
       • LCD Monitors
         • Reach maximum brightness immediately
         • Sharper image
         • Consume little power
       • OLED Screens
         • Thinner
         • Brighter
           • No backlight
         • Respond 200 times faster
         • Do not last long
     • Printers
       • Laser
         • Affordable
         • Home printers
         • Businesses
         • Better for printing text
       • Inkjet
         • Photo-realistic images
         • Cheaper
         • Slower
         • Replace ink cartridges
       • Dot Matrix
         • Operate in damp or dirty environments
         • Noisy
         • Slow
         • Poor print quality
       • 3-D
         • Vehicle parts
         • Medical equipment
         • Prosthetic limbs
     • Multimedia Projectors
       • Classrooms
       • Makes teaching easier
     • Computer Speakers
       • Music
       • Video soundtracks
       • Sat-nav
       • Notifications
     • Actuators
       • Used with sensors to control mechanisms
       • Opening window
       • Starting pump
       • Turning wheel
       • Controlling devices in smart home

2. Magnetic, Flash and Optical Storage Devices

   • Magnetic
     • Hard Disk
       • Less portable
       • Large capcity
         • Desktops
   • Optical Disk
     • Cheap
     • Three formats
       • Read-only
       • Recordable
       • Rewritable
     • Easy to distribute
     • Easily damaged
   • Flash
     • Solid State Disk
       • Low capacity
       • Faster access speed
       • Consume less power
       • Less susceptible to damage
       • Mobile phones and MP3 players
         • Silent
         • Light
         • Portable

3. Virtual Storage

   • RAM not large enough to store all programs at same time
     • Hard disk used as extension of memory

4. RAM and ROM

   • Random Access Memory
     • Store programs and data being used
     • Volatile
       • Contents lost when computer turned off
   • Read-Only Memory
     • Hold information permanently in memory
     • Embedded systems never change so held in ROM