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Chapter 6. Data Terminals and Personal Computers. Agenda. Terminals Cluster control units Workstation ergonomics Terminal selection criteria Total cost of ownership of personal computer. Terminal Classification. Definition Input/output devices Data terminal equipment (DTE)

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chapter 6

Chapter 6

Data Terminals and Personal Computers

agenda
Agenda
  • Terminals
  • Cluster control units
  • Workstation ergonomics
  • Terminal selection criteria
  • Total cost of ownership of personal computer
terminal classification
Terminal Classification
  • Definition
    • Input/output devices
    • Data terminal equipment (DTE)
    • Data circuit-terminating equipment (DCE)
  • Classification
    • Teletypewriters
    • Video display terminals (VDTs)
    • Personal computers
    • Industry-oriented transaction terminals
    • Intelligent terminals
    • Specialized terminals
teletypewriter terminals
Teletypewriter Terminals
  • Types
    • Unbuffered
    • Buffered
  • Characteristics
    • Slow speed
    • Mechanical dot matrix printing
    • Hard copy
video display terminals vdt i
Video Display Terminals (VDT) - I
  • Types
    • Cathode ray tube terminal (CRT)
    • Flat panel displays
  • Characteristics
    • Electronic
    • Reliable
    • Buffered
    • High speed
    • Unintelligent - intelligent
video display terminals vdt ii
Video Display Terminals (VDT) - II
  • Screen
    • All-point-addressable (APA)
    • Pixels or pels
    • Line-by-line mode
    • Page or formatted mode
    • Intensifying, blink, or reverse video
  • Keyboard
  • Alternative input mechanisms
    • Touch-sensitive
    • Joystick
    • Trackball
    • Mouse
video display terminals vdt iii
Video Display Terminals (VDT) - III
  • Selection criteria
    • Nonglare surface
    • Titled or swiveled mechanism
    • Color or monochrome
    • Image flickfree
    • Size
    • Resolution
    • Programmable
    • Graphics capability
personal computers
Personal Computers
  • Types
    • Microcomputer (portable, laptop, or notebook)
    • Workstation
    • Internet computers
  • Characteristics
    • Upload and download (FTP)
    • Terminal emulation program & hardware (DEC VT-, IBM 3270)
    • Graphical user interface (GUI)
    • Multitasking
  • Virus
others
Others
  • Industry-oriented transaction terminals
    • ATM & point of sale
  • Remote job entry
  • Facsimile machines
    • Group I, II, III, III enhanced, super III, IV
    • Security problems (audio cassette recorder)
  • Specialized terminals
    • Telephone
    • Optical recognition (bar code reader, optical character recognition (OCR))
    • Other terminals for counting, weighing, measuring, and reporting results to the computer
terminals intelligence
Terminals Intelligence
  • Intelligent terminals: program & storage capability
  • Smart terminals: storage capability
  • Dumb terminals: no or limited storage capability
cluster control units
Cluster Control Units
  • Characteristics
    • Program capability
    • Buffers
  • Functions
    • Control terminals
    • Code conversion
    • Error checking
    • Share printer
    • Access multiple computers
    • Multiple sessions using hot key
workstation ergonomics
Workstation Ergonomics
  • Nonglare screen
  • Tilted back 10 to 20 degrees
  • Top of screen is eye level
  • 18 inches from eyes
  • Adjustable chair
  • Movable keyboard
  • Proper lighting
terminal selection criteria
Terminal Selection Criteria
  • Special or general
  • Hardcopy or video display
  • Types of operators
  • Compatibility with the existing equipment
  • Degree of intelligent
  • Cost
  • Vendor support and service
total cost of ownership
Total Cost of Ownership
  • Cost
    • $6,400 to over $13,000 lifetime
    • Hardware & software cost – 20%
    • User operational cost (learning & training) – 46%
    • Technical support cost – 21%
    • Administrative cost – 13%
  • Control
    • Centralized management
    • Standardizing hardware and software
points to remember
Points to Remember
  • Terminals
  • Cluster control units
  • Workstation ergonomics
  • Terminal selection criteria
  • Total cost of ownership of personal computer
discussion
Discussion
  • Design terminal requirement for a big manufacturing company
  • Design terminal requirement for a big insurance company