1. Computer Software
CS 107
Lecture 2
September 1, 2006
12:53 PM

2. Computers do four things (+1)
Input data
Process data into information
Output information
Store data & information
(Communicate with other computers)
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:12:53 PM

3. What is computer software?
A set of instructions which control what the computer does
12:53 PM

4. What does computer software do?
Translates human language to computer language and computer language to human language
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5. Software history Rewiring the hardware Binary Machine code - Assembly
Higher level languages
Fortran
Cobol
Basic
C, C++
Visual Basic
Java
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6. How does software work File loaded into memory
Instruction sent to processor for execution
Results are stored back into memory
Instruction cycle repeats
Memory is released at termination
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7. Types of Software System Software Applications Software Manager
Protector
Applications Software
Laborer
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8. System software is a manager
Manages processing
Manages computer memory
Manages files
Manages peripheral devices & networks
Manages application software programs
Manages multi users
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9. Parts of the system software
Kernel
User interface
Command-based / Text-based
Graphical user interface (GUI)
Device drivers
Resource managers
Utility programs
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10. Types of system software
One computer - one user
Windows XP, Mac OS X, Linux
One computer - many users
Unix, proprietary OS
Many computers - Many users
Windows Server 2003, Unix, Novell Netware
Embedded system software
Palm OS
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11. History of PC system software
DOS - command/text based
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12. History of PC system software
Apple Lisa - GUI
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13. History of PC system software
Mac Classic - GUI
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14. History of PC system software
Windows operating shell
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15. History of PC system software
Windows operating shell
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16. History of PC system software
Windows 95
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17. History of PC system software
Windows 2000
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18. History of PC system software
Windows XP
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19. Current PC systems software
Windows
2000 XP
Server 2003
Mac
OS 9
OS X
Linux
Lindows
Red Hat
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20. Future systems software
Windows Vista
Mac Leopard
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