Transcript Intro to the AS/400 - Florida State College
Intro to Info Tech
Systems S/W
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Objectives
Explain 2 types
Operating Systems
The general purpose of Specific tasks of
Utility Programs
Types of Copyright 2014 by Janson Industries 2
Operating System
Set of programs that: Enable h/w to function Provide a user interface Manage system resources Configure devices Schedule jobs Monitor: • • • Performance Memory Applications Provide security Copyright 2014 by Janson Industries 3
Operating System
Set of programs that: Enable users to run applications Provide common functions for applications Printing Saving and retrieving files • This is how OS came about Establish Internet connections Copyright 2014 by Janson Industries 4
Operating Systems
PCs use Windows, Linux, or OSX (Macs) Some computers can run multiple Midrange and mainframes use different OS OS also called a platform: Applications written for specific platforms Must buy correct application for your platform Copyright 2014 by Janson Industries 5
OS Functions
Booting: starting the computer Cold boot: powering on the computer Warm boot: restarting When installing new applications, often must reboot (warm boot) OS programs stored on hard drive Copyright 2014 by Janson Industries When booting: Kernel loaded into main memory Kernel comprised of those programs that provide basic OS functions Remains in MM 6
OS Interfaces
Interface is the way users can enter data and instructions and how information is displayed Two types: Command Line Interface (CLI) Graphical User Interface (GUI) Command line requires commands and syntax GUI is point and click 7 Copyright 2014 by Janson Industries
Command line Entered command and pressed Enter
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GUI Clicked on icons
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OS Categories
Identified by how many tasks and users it can support simultaneously Single user/single task Smaller devices only allow one user to run one application at a time Single user/multi-tasking Can run many apps at the same time Only one app is active 9 Copyright 2014 by Janson Industries
OS Categories
Multi-user Many users can run many apps at the same time Larger computers Networks Multi-processor Supports many CPUs and many active jobs Many apps can be running simultaneously 10 Copyright 2014 by Janson Industries
OS
Manages MM OS assigns memory to applications When apps done, releases memory Sometimes apps too big for RAM Solution: Virtual Memory App broken up into pages (pieces) Pages loaded into MM as needed Removed when not needed 11 Copyright 2014 by Janson Industries
OS
Also sets up and manages buffers Memory that acts as a waiting area Classic example: print buffer Printer slow compared to CPU Instead of CPU waiting for printer to accept next print job Output sent to buffer When printer ready Output retrieved from buffer and sent to printer This process is called SPOOL ing Copyright 2014 by Janson Industries S imultaneous P eripheral O perations O n L ine 12
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Set up date/time to run an app
Where to store What to store
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When to store
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Scheduling Jobs
In multi-user environment OS will allow priorities to be assigned By user CEO has highest priority By type of job Print job higher than browsing web Availability of resources External storage busy 15 Copyright 2014 by Janson Industries
Configuring Devices
Each device has its own commands OS contains "drivers" (programs) to communicate with the most common devices Drivers loaded into MM when computer started If OS doesn't have driver, you may have to install the driver Usually comes with device or easily downloaded from the Web 16 Copyright 2014 by Janson Industries
Monitor Performance
CPU utilization 17 Copyright 2014 by Janson Industries
Can see multiple resources at a time
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Monitor Performance
Disk space used/available Copyright 2014 by Janson Industries 19
Monitor Performance
App/process monitoring Copyright 2014 by Janson Industries 20
Monitor Performance
Disk fragmentation Analyses first, then, if needed, defrag Copyright 2014 by Janson Industries 21
File Management
Organize in folders Copy Delete Search
Search particularly helpful when you forgot where you saved it or what you named it
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File Management
Disk scanner Looks for unused/temp files Looks for uncompressed files Lets you easily delete and compress them 23 Copyright 2014 by Janson Industries
Copyright 2014 by Janson Industries Uninstaller Easily remove an app 24
Security
Create Userids and Passwords Force users to log on to the computer Enforce at file and application level Keeps track of incorrect log on attempts May disable Userid after a certain number of incorrect attempts Keeps track of unauthorized attempts to access files and apps 25 Copyright 2014 by Janson Industries
Security
Most provide some firewall Protects computer from unauthorized access I.e. you download a web page that contains a program that looks through hard drive and email for • • • Credit Card numbers SSN Bank Statements Some anti-virus protection Usually need utility programs for better/most up to date security Copyright 2014 by Janson Industries 26
Lots of OS
Handheld – Palm, Symbian (Nokia), Blackberry OS, Android, iPhone, Windows Phone 7 PC – Windows, OS X, Linux Midrange – Solaris, IBM i, Linux Mainframe – MVS, VM, Unix, Linux Copyright 2014 by Janson Industries Most are proprietary, Linux and Android are open source Said another way: most you must pay for, open source is free 27
Open Source vs. Closed Source
Open source price is better pro But if everyone can see source code Greater security risk con More eyes to catch errors pro More programmers can work on to improve pro But if not paid for it, what's the incentive to build/maintain open source s/w? con Copyright 2014 by Janson Industries 28
Utility Programs
S/W that enables the computer to work better Example: www.inksaver.com
Potential 75% decrease in ink used Would you pay $32 for that?
MS continually crams more into OS that was handled by stand alone utils Copyright 2014 by Janson Industries However, stand alones usually do a better job than those utilities included in Windows Can buy Often a free version available online 29
Utility Programs Types
Antivirus Virus: s/w that will harm or impede your computers applications and data Some harmless: Yankee Doodle Some not: Michaelangelo Two types: Worms – replicate themselves Trojan horse – hidden in other s/w, email, etc.
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Utility Programs Types
Spyware and Spyware removers You may want to install Websites will install without permission Spyware removers usually also remove adware Internet filters Antispam: usually included in email app (MS Outlook) or by email provider Web filter: usually included in browser (MS IE, Firefox, Chrome, etc.) Pop up blocker: usually included in browser Copyright 2014 by Janson Industries 31
Utility Programs Types
File compression: zip and unzip files to save space on drives OS will often do automatically PKZIP, WinZip File conversion WAV to MP3, Word to PDF, Access to Excel Media Players Why not just use Media Player?
Can it access your iPod?
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Points to Remember
Operating Systems enable the computer hardware to work Provides a GUI and commands to perform system functions Enable the h/w and applications to function For classroom based classes:
Bring your thumb drive to the next class
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