COMPUTER HARDWARE

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COMPUTER HARDWARE
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COMPUTER GENERATIONS
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TYPES OF COMPUTERS

• Main frame
• Minicomputer
• Supercomputer
• Microcomputer

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COMPUTER MEMORY

• Bits 0101 1110 1111 0111 1100 1010
• Hexadecimal 5E F7 CA
• Bytes
• Characters (ASCII, EBCDIC, UNICODE)
• Integers
• Floating point
• Packed decimal
• Strings
• Booleans

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MAGNITUDE PREFIXES
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PARTS OF A COMPUTER

• Central processing unit (CPU)
• Arithmetic logic unit (ALU) Registers
• Instruction fetcher Instruction decoder
• Random access memory (RAM)
• Read only memory (ROM)
• Cache
• Bus
• Peripheral devices

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PERIFERAL DEVICES (Input)

• Keyboard (keys, size, layout)
• Mouse (mechanical, optical)
• Trackball, touchpad, mouse stick
• Microphone
• Scanner (OCR)
• Bar code reader
• Card reader
• Paper tape reader

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PERIFERAL DEVICES (Output)

• Monitor (resolution)
• Printer
• Speaker
• Plotter
• Synthesizer
• Card punch
• Paper tape punch

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PERIFERAL DEVICES (Both)

• Disk drive (hard disk, floppy disk)
• Optical drive (CD, DVD)
• Tape drive
• Drum
• Modem
• Network card
• Ports (Parallel, Serial, USB, Firewire)

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PRINTERS

• Ink jet printer
• Lazar jet printer
• Daisy wheel
• Line printer

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BUYING A MICROCOMPUTER

• Complicated because the market changes so quickly
• First choose a style
• desktop, laptop, notebook
• Choose between APPLE and the rest of the PC world
  (Dell, Gateway, IBM, etc.)
• APPLEgenerally
• more expensive more reliable
• less flexible easier to use

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MICROCOMPUTER GROWTH