csce101 – op codes (continued), 4.4, 4.5, 5.2 tuesday, october 31, 2006 and thursday, november 2,...
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CSCE101 – Op Codes (continued), 4.4, 4.5, 5.2Tuesday, October 31, 2006 and Thursday, November 2, 2006
Secondary Storage
• Floppy disks and zip disks• Hard disks
– How it works– Head crash– Controllers– RAID (Redundant array of independent disks)
• CDs and DVDs– How they work– DVD Zones
Secondary Storage (continued)
• Magnetic Tape
• Cards– Magnetic Strip– Smart Cards– Optical Cards
• Flash Memory– Non-volatile– Cards, sticks, drives
Future Developments in Processing
• Selling processing power
• Nanotechnology - molecules
• Optical computing – or opto-electronic
• DNA computing – DNA strands store information using CTGA
• Quantum computing – atoms
Future Developments in Storage
• Higher-density disks – perpendicular recording
• Polymer memory – probe storage (200 gigabits per square inch)
5.2 –Input Hardware
• Keyboards– Wired or wireless (RF or IR)– Virtual– Specialty
• Mouse– Mechanical– Optical– Specialty
Input Hardware (continued)
• Touch screens
• Pen input– Pen input for handwriting– Light pens– Digitizer with digitizing tablet
• Scanners– Like photocopiers– Dots and bitmaps
Input Hardware (continued)
• Scanners (continued)– Color depth or bit depth (48-bit color depth is
considered high quality.)– Resolution is measured in dots per inch (dpi)– Dpi can be 300 X 200 up to 2400 X 2400
• Bar-Code readers– 1D, 2D, 3D
• Mark and character recognition– MICR, OMR, OCR
Input Hardware (continued)
• Fax machines– Dedicated or circuit board
• Bar-Code readers– 1D, 2D, 3D
• Mark and character recognition– MICR, OMR, OCR
Input Hardware (continued)
• Audio input devices– Sound board or MIDI board– Microphone– Speech recognition software
• For computer control• To translate spoken word into text
Input Hardware (continued)
• Video input– Video cameras
• Videoconferencing• Frame-grabber video card or full-motion video
card• Software• Video Camera
– Digital cameras• Photosites on a light-sensitive processor chip
capture images• Light->electrons->bits
Input Hardware (continued)
• Video input (continued)– Digital cameras (continued)
• Can be connected to the computer using a USB or Firewire connection
• Or disk is inserted into computer drive
• Sensors – everywhere and used to monitor environment
• RFID tags – cattle, pets, library books• Biometric input devices – hand scanners,
fingerprint scanner, retinal scanners
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