From Chapter 1 - Computers- Understanding Technology

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Presentation transcript:

From Chapter 1 - Computers- Understanding Technology Our Digital World From Chapter 1 - Computers- Understanding Technology

Digital vs. Analog Digital means an electronic signal that is processed, sent, and stored in discrete parts (bits) rather than an analog signal, which is a series of electronic pulses in a continuous wave

What is a Computer? Operates under control of a set of instructions, that is stored in its memory Accepts data from a user Manipulates the data according to the programmed instructions Produces the results Stores the results for future use

Special-Purpose vs. General- Purpose Computers Special-purpose, or embedded computers, perform a few specific actions whereas general purpose computers can perform a wide range of actions Examples of special purpose computers would include digital thermometer, microwave oven, digital camera

Information Processing Cycle Input Processing Output Storage

Computer Hardware Components Input Devices (Chapter 2) Central Processing Unit (CPU) (Chapter 2) Memory (Chapter 2) Output Devices (Chapter 3) Storage Devices (Chapter 3) Communications Devices

Computer Software System software (Chapter 4) - Operating system (e.g. Windows, Macintosh) and utility software (e.g. file backup, virus protection) Application software (Chapter 5) – Office software, browsers, etc. Communications software (Chapter 5)

Categories of Computers Personal computers – desktop, laptop, notebook, handheld (personal digital assistant) Workstation – look like PCs but more powerful Midrange server or minicomputer Mainframe computer Supercomputer