CS 3 - Kurtz  Santa Monica College 

SYSTEM SOFTWARE

 

 

Files 

 

Contain data

 

Folders

May contain files or other folders (sub-folders)

Two types of System Software

Operating Systems
Utility Programs (utilities)

Operating System

The set of programs containing instructions that coordinates all of the activities among computer resources.

Utility Programs

Utility
A type of system software that performs a specific task, usually related to managing a computer, its devices, or its programs.
Printer Drivers, Memory Manager, File Manager, Task Scheduler, Uninstaller.

Memory Manager

Optimizes use of RAM
Prevents memory conflicts between programs

Drivers

Contains specialized commands for devices on computer
Necessary for the mouse, keyboard, monitor, printers, disks, etc.

Printer Drivers

Queues multiple print jobs for same printer in buffer
Interprets and formats data for printer

Single User Operating Systems

Supports one user at a time (e.g., DOS).

Multitasking Operating System

Able to run multiple jobs (programs) simultaneously
Windows, Mac OS, UNIX

Multiuser Operating System

Able to support more than one user running different jobs simultaneously
Windows NT, 2000, XP Pro, 2003
UNIX, Linux

Multiprocessing Operating System

Supports multiple CPUs in one computer
Coordinates workload and memory allocation
Windows NT, 2000, 2003
UNIX, Linux

Cross-platform Operating Systems

Able to run on different types of CPU

Memory resident software

Always present in RAM
May not be swapped

Fault tolerant computers

Contain redundant hardware
Will continue to operate despite some hardware failure
Used in “mission critical” systems such as airline reservations, communication networks, ATMs.

File Manager

Manages file “directories”
Copy and format disks
Displays files on disk
Monitors and displays free and used space on disk
Windows Explorer is a file manager

 

Windows Explorer 

 

Useful for viewing and manipulating files

 

Moving and Copying Files 

 

Easy to do in a GUI environment Dragging an icon to another folder on same disk moves file Dragging an icon to a folder on different disk copies file Shift and Control keys allow copy and move of file groups

 

Moving Windows

 

Drag title bar

 

Graphical User Interface 

 

Uses icons and a pointing device

 

Command-line Interface 

 

Commands must be typed in

Plug and Play

OS automatically recognizes new hardware, installs and configures driver.

 

Path 

 

Precise hierarchical description of a storage location within a computer system or network Tells us exactly where in a disk's filing hierarchy a file is located Example: C:\LETTERS\Old\Dave.doc

 

C Drive

 

Typically the default "hard drive" or "hard disk" on a Windows computer

 

 

 

A Drive, B Drive

 

Typically the floppy disk drive(s) on a Windows computer