Data Terminals and Personal Computers

1
Chapter 6

• Data Terminals and Personal Computers

2
Agenda

• Terminals
• Cluster control units
• Workstation ergonomics
• Terminal selection criteria
• Total cost of ownership of personal computer

3
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

4
Teletypewriter Terminals

• Types
• Unbuffered
• Buffered
• Characteristics
• Slow speed
• Mechanical dot matrix printing
• Hard copy

5
Video Display Terminals (VDT) - I

• Types
• Cathode ray tube terminal (CRT)
• Flat panel displays
• Characteristics
• Electronic
• Reliable
• Buffered
• High speed
• Unintelligent - intelligent

6
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

7
Video Display Terminals (VDT) - III

• Selection criteria
• Nonglare surface
• Titled or swiveled mechanism
• Color or monochrome
• Image flickfree
• Size
• Resolution
• Programmable
• Graphics capability

8
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

9
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

10
Terminals Intelligence

• Intelligent terminals program storage
  capability
• Smart terminals storage capability
• Dumb terminals no or limited storage capability

11
Cluster Control Units

• Characteristics
• Program capability
• Buffers
• Functions
• Control terminals
• Code conversion
• Error checking
• Share printer
• Access multiple computers
• Multiple sessions using hot key

12
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

13
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

14
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

15
Points to Remember

• Terminals
• Cluster control units
• Workstation ergonomics
• Terminal selection criteria
• Total cost of ownership of personal computer

16
Discussion

• Design terminal requirement for a big
  manufacturing company
• Design terminal requirement for a big insurance
  company