COP4600_10-5 - COP4600 5/10/10 Overview of a computer...

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COP4600 5/10/10 Overview of a computer system Application(s) ________ Operating System ________ Hardware -Memory -IO Devices -CPUS -ISA -FU -physical devices What is an operating system ? Top-down view -it is an extended machine -hides the messy hardware details -presents to the user (an extended) machine that is easier to use than the bare hardware Bottom-up view -the OS is a resource manager (makes all the parts of a complex system work together)
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-gives (executing) programs time on a resource -give space on a resource 1 st Gen ( 1945-1955 ) -vacuum tubes and plugboards -No OS 2 nd Gen ( 1955-1965 ) -transistors - batch OS: one job run (to completion) at a time 3 rd Gen ( 1965-1980 ) -integrated circuits - multiprogramming -multiple programs loaded into the computer’s memory at the same time -when the executing program needs to wait for IO, start executing one of the other memory resident programs. -Tanenbaum says 80-90% of the (wall-clock) time
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This note was uploaded on 02/22/2011 for the course ECON 2023 taught by Professor Rush during the Spring '08 term at University of Florida.

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COP4600_10-5 - COP4600 5/10/10 Overview of a computer...

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