Software Chapter 2
Basic Types of Software • System software - provides an environment in which the application software can run Applications software - is the software that performs a specific function such as writing a letter, calculating a spreadsheet, drawing a picture.
System Software • Utilities • Device Drivers • Language Translators
System Software Components • Operating System (sometimes called the Kernel) is loaded into RAM when the system is booted. System supervisor. • Data Management - keeping track of data in secondary storage • TP Monitor - keeping track of multiple terminal entry into large computer systems • Network Operating System - controls flow of data within a network • Communications Protocol - establishes rules for sending data across network • Messaging Protocols - establishes rules for e-mail transmissions • Drives - supplement the operating system and allow it to communicate with the device that the driver matches. (Upgrades can be found on the Internet
Utility Programs • Support Operating System – – – – Diagnostic Programs Backup Utilities Data Recovery Utlity Antivirus software Data Compression Memory Management Defraggers
Operating Systems
Platforms • • DOS Windows NT Unix OS/2 Macintosh Mainframes
Terms to Know • Multi-tasking – allows more than one program at a time • Network Terms – Multiprogramming - multi-user version of multi-tasking – Multi-processing - refers to the ability for more than one processor to execute a program, thus sharing the workload • Time Sharing – Allows each user a small slice of time, then moves on the next user.
Interfaces • Command Driven – User must initiate each action by correctly keying in a command – Example: DOS • Graphic User Interfaces (GUIs) – User can initiate most actions by pointing to a picture with a mouse. (Windows)
Software Families • Browsers – Netscape – Microsoft Internet • Word Processing – Microsoft Word – Word Perfect
Software Families • Spreadsheets – Microsoft Excel – Lotus – Quatro Pro • Presentation Software – Powerpoint – Corel Presentation – Lotus Freelance
Software Families • Databases – Microsoft Access – Microsoft Fox. Pro – Paradox
Choose Application Software First -- Then buy a computer that can run the software
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