itm studyguide2

itm studyguide2 - InformationTechnologies...

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Information Technologies Core computer components - Input devices Human ID -Keyboard, Mouse Machine ID -Bar code scanners - Output devices Monitors, printers - Primary storage Digital data stored in bits Byte= 8 bits ROM Read only memory Controls startup process Non-volatile RAM Random access memory Temporary memory; volatile Increasing RAM is easiest way to make PC better - Secondary storage Non-volatile Slower to access than memory Hard drives, CDs DVDs, USB flash drives - CPU Arithmetic and logic unit (ALU) -performs logic and arithmetic operations Control unit (CU) -controls/coordinates other parts of system Registers used for intermediate results Speed measured in hertz Gigahertz- billions of instructions/second Word length- bits processed at one time Clock speed- one  billion  cycles per second  - Busses Data bus
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-bits moved between CPU and other devices - Communications NIC Network interface card provides physical connection for PC to network Modems remote network over telecommunications line. telephone/cable Software System software Programs that manage computer hardware and application software Operating Systems Platform for other programs to run Starts the computer -Boots, executes BIOS (basic input output system) in ROM, loads OS  from  hard drive to RAM Manages files -Free space, used space, formerly used space, shows C:/ Manages programs and memory -Sends programs to CPU, allocates primary storage for program, controls 
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This note was uploaded on 04/25/2011 for the course ITM 200 taught by Professor Taylor during the Spring '09 term at Saint Louis.

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itm studyguide2 - InformationTechnologies...

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