COMPUTER NOTES MARCH 11 2008

COMPUTER NOTES MARCH 11 2008 - COMPUTER NOTES Operating...

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COMPUTER NOTES MARCH 11 2008 Operating System- O/S keeps the system running smoothly Helps to coordinate the working parts Is external Stored on Hard Disk (Memory Resident) “kernel” or “supervisor” Part of O/S that stays in memory during session 4 Functions of an O/S Managing problems Managing memory Handling input and output Establish a user interface Managing Programs Single User Single Tasking (PDA, Palm O/S, MS-DOS) Single User Multi-Tasking (Windows XP, Vista, OSX) Multi User O/S- (Novell, Unix, Mainframe Supercomputer) Real Time O/S- O/S that is created for a certain device, can only be used by that device Managing Memory Partition- O/S assigns partition in memory (RAM) for each program running Virtual Memory- Hard disk serves as an extension of RAM Swap file- When memory is full is full hard disk turns to this Handling I/O Monitors, modems, sound cards, etc. I/O devices send signals, interrupts to O/S O/S prioritizes I/O activity
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