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The Digital World vs The Real World

The Digital World vs The Real World. Computers “speak” in terms of the binary language (“1” and “0”) which represent on and off pulses of electricity. Digital is very discreet - either the pulse is there or it isn’t.

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The Digital World vs The Real World

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  1. The Digital World vs The Real World • Computers “speak” in terms of the binary language (“1” and “0”) which represent on and off pulses of electricity. • Digital is very discreet - either the pulse is there or it isn’t. • Our world is not discreet. We “speak” and hear along a continuous analog wave. • Our language is not discreet. What humans recognize as language must be converted to machine language.

  2. The Digital World vs The Real World • A “machine cycle” is the amount of time that it takes for a computer to: • Fetch and instruction from RAM (which has been put there as an input process from our world) • Decode the instruction into machine language • Execute the instruction inside of the ALU • Return the result back to RAM (which is then returned to us as an output process by the OS) • Measured in terms of MHz or MIPS (millions of instructions per second)

  3. Classification of computer systems • Microcomputers • Mainframes • Supercomputers

  4. Microcomputers • Personal computer: single-user computer. Desktop model, laptop, notebook, subnotebook, Personal Digital Assistants (PDAs) • Workstations: special PCs designed to support applications that require more power than ordinary personal computing. • Embedded: microcomputer is embedded inside of another machine. • Convergent Technologies • Network computers

  5. Supercomputers • Usually several large integrated computers. Used primarily in defense and scientific organizations to process enormous amounts of data extremely fast. • Finding more use in traditional transaction environments.

  6. Mainframe • Large centralized computers. Normally used to process operational business transactions. Some firms may have more than one mainframe. • Usually supports hundreds or thousands of users. • Large data storage ability

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