Monday, December 20, 2010

Operating System Support

  • Convenience 
    • Making the computer easier to use 
  • Efficiency 
    • Allowing better use of computer resources
Operating System Services
  • Program creation 
  • Program execution 
  • Access to I/O devices 
  • Controlled access to files 
  • System access 
  • Error detection and response 
  • Accounting
Types of Operating System
  • Interactive 
  • Batch 
  • Single program (Uni-programming) 
  • Multi-programming (Multi-tasking)
Early Systems
  • Late 1940s to mid 1950s 
  • No Operating System 
  • Programs interact directly with hardware 
  • Two main problems: 
    • Scheduling
    •  Setup time


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