Team questions

1
Team questions

• Team 1. What trends are occurring in the
  development and use of the major types of
  computer systems?
• Team 2. Will the convergence of PDAs,
  sub-notebook PCs, and cell phones produce an
  information appliance that will make all of
  those categories obsolete? Why or why not?
• Team 3 Refer to the Real World Case on mobile
  devices and wireless technologies in the chapter.
  Should mobile wireless technologies be bundled
  together in a generic fashion (i.e. voice, data,
  messaging, calendaring, etc.) or should
  manufacturers allow for customization of mobile
  devices to be more industry or task specific?
  Explain.
• Team 4 Do you think that information appliances
  like PDAs will replace personal computers (PCs)
  in business applications? Explain.
• Team 5. Are networks of PCs and servers making
  mainframe computers obsolete? Explain.
• Team 6. What are several important computer
  hardware developments that you expect to happen
  in the next ten years? How will these affect the
  business use of computers?

2
Pointing Devices

• Electronic Mouse
• Trackball
• Pointing Stick
• Touchpad
• Touch Screen

3
Pen-based Computing

• Used in Tablet PCs and PDAs
• Pressure-sensitive layer like touch screen under
  liquid crystal display screen
• Have software that digitizes handwriting, hand
  printing, and hand drawing

4
Speech Recognition Systems

• Discrete pause between each word
• Continuous conversationally-paced speech
• System compares your speech patterns to library
  of sound patterns

5
Optical Scanning

• Read text or graphics and convert them into
  digital input
• Desktop or flatbed scanners
• Optical Character Recognition (OCR)
• Read characters and codes
• Used to read merchandise tags, sort mail, score
  tests
• Optical scanning wands
• Read bar codes such as the Universal Product Code
  (UPC)

6
Other Input Technologies

• Magnetic stripe
• Read magnetic stripe on credit cards
• Smart cards
• Microprocessor chip and memory on credit card
• Used more often in Europe than in US
• Digital cameras
• Magnetic Ink Character Recognition (MICR)
• Identification numbers of bank and account
  printed in magnetic ink on bottom of check

7
Output Technologies

• Video displays
• Cathode ray tube (CRT) like a television
• Most desktop PC screens
• Liquid crystal displays (LCDs)
• Laptop and PDAs, some PCs
• Printed Output
• Inkjet printer
• Spray ink on page
• Laser printer
• Electrostatic process like photocopying machine
• Voice response systems

8
Storage tradeoffs
9
Computer Storage Fundamentals

• Binary representation
• Data are processed and stored in computer system
  through the presence or absence of signals
• Either ON or OFF
• ON number 1
• OFF number 0

10
Bit vs. Byte
11
Representing characters in bytes
12
(No Transcript)
13
Direct and sequential access
14
Two types of semiconductor memory

• RAM random access memory
• ROM read only memory

15
Flash drive

• New type of permanent storage
• Uses semiconductor memory
• Small chip with thousands of transistors
• Easily transported
• Also called jump drives, USB flash drives

Source Courtesy of Lexar Media.
16
Magnetic Disks

• Used for secondary storage
• Fast access and high storage capacity

Source Quantum.
Source Corbis.
17
Radio Frequency Identification

• RFID
• Tag and identify mobile objects
• E.g., store merchandise, postal packages, pets
• Use RFID chips to transmit and receive radio
  signals
• Chips half the size of a grain of sand
• Passive chips
• do not have power source and derive power from
  signal in reader
• Active chips
• Self-powered

18
RFID versus bar codes

• RFID
• Scan from greater distance
• Can store data
• Allows more information to be tracked
• Privacy concerns due to invisible nature