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16 Cards in this Set
- Front
- Back
Operating System
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Understanding the operating system is essential part of troubleshooting
Most appear similar when on the screen display, but there are many differences in the way they handle activities IE: Storing data/ Interfacing with the user/ Presenting information on the screen. Each one has its own strengths & weaknesses so as it continues to evolve there will be improvements/ updates available regularly. The Kernel - Is the core program of any operating system Which is enhanced by other software applications that refine the computer system It is the Software that provides the computer with a file system structure & ability to communicate with the hardware. It communicates with disk storage units IE: Monitors/ Printer/ Memory & other computer components It Makes sure programs running on the computer do not interfere with one another These core operating system programs provide user interface style/ security & software Software communicates with BIOS which then translates the request of the applicati |
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Multi-Tasking
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Not all operating systems support multitasking
Those that do support it do so differently Ex: DOS does not support it - Must run only one program at a time Though it appears to the user that the programs are working simultaneously - In reality the computer is actually switching control between the 2 programs giving the illusion it is happening at the same time. Ex: Using the printer/ checking your e-mails/ surfing the net/ running an application or game The computer runs _____ while in between sending packets of Data to run _____ |
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Preemptive Multi-Tasking
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An operating system that can support 2 or more programs running at the same time - Which is known as Time Slicing.
All programs running in the in this mode are sharing RAM No single program can take total control of the Computer System - If 2 programs attempt to do so the computer will lock up Common To: Windows 95/ Me/ XP/ Vista/ NT/ 2000/ OS/2/ Mac OSX |
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Thread/ Threads
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When more than 1 CPU is installed on a motherboard - The data & parts of a program can be shared between 2 or more CPU’s
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Cooperative Multi-Tasking:
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1 program dominates the Operating System - But will still allow another program to run while it is idle.
Common To: Mac OS9 |
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User Interface
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There are 2 dominant user interfaces to issue commands on a computer system - Textline Command & Graphic User Interface
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Text line Command
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Commands that are issued at a command prompt - IE: MS-DOS/ PC-DOS/ Linux & UNIX
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C:\>mem
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DOS Command that displays information about the type & amount of system memory
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C:\>cd\_____
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DOS Command that changes the command line from the current directory to another
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C:\>copy
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DOS Command that copies date from one location to another
IE: __ file is being copied from drive A to drive C |
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C:\>dir
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DOS Command that displays the current directory
All the files & directories directly connected to the root directory will be displayed |
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C:\>exit
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When DOS is accessed from Windows & this command is issued at the DOS command line
DOS is closed & control returns to Windows desktop |
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C:\>md
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Creates a directory
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C:\>rd
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Deletes or removes a directory
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C:\>chkdsk
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Checks a disk for errors & displays the findings on the monitor
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C:\>format
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Prepares a disk for 1st time usage
Today most disks are already formatted or prepared to store date and programs. You must be careful when issuing the command format because it can erase all data on the disk being formatted |