CST8174_Lecture_20_Operating_Systems

CST8174_Lecture_20_Operating_Systems - CST 8174 Computer...

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05/07/09   CST 8174 Computer Technology Basics Algonquin College
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05/07/09   Algonquin College CST 8174                       1-2 Operating System Concepts Role of an O/S Architecture of common desktop O/S Plug and Play Concepts
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05/07/09   Algonquin College CST 8174                       1-3 Roles of an O/S What does an O/S do? Managing hardware resources Manages software resources Provides an interface for applications to interact with system without being aware of the specifics of the hardware.
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05/07/09   Algonquin College CST 8174                       1-4 Hardware Resources An operating system treats a computer  as a collection of resources
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05/07/09   Algonquin College CST 8174                       1-5 Hardware Resources An operating system treats a computer  as a collection of resources What’s a resource?
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05/07/09   Algonquin College CST 8174                       1-6 Hardware Resources An operating system treats a computer  as a collection of resources What’s a resource?
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05/07/09   Algonquin College CST 8174                       1-7 Hardware Resources An operating system treats a computer  as a collection of resources What’s a resource?
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05/07/09   Algonquin College CST 8174                       1-8 Hardware Resources An operating system treats a computer  as a collection of resources What’s a resource?
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05/07/09   Algonquin College CST 8174                       1-9 Hardware Resources An operating system treats a computer  as a collection of resources What’s a resource? Disk Space I/O System Memory
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05/07/09   Algonquin College CST 8174                       1-10 Hardware Resources An O/S such as Windows manages numerous hardware  components that may be allocated to a program or process Such as …  DMA channels IRQs System Memory Disk Space
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05/07/09   Algonquin College CST 8174                       1-11 Managing Hardware Resources - DMA A PC provides eight DMA channels  These may assigned to devices which require  DMA For example . . Storage devices (FDD, HDD, DVD, CD) Sound Cards O/S must  Assign channels Resolve conflicts
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05/07/09   Algonquin College CST 8174                       1-12 Managing Resources - IRQ IRQ stands for “ Interrupt  Request Indicates a peripheral requires  attention by the CPU
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CST8174_Lecture_20_Operating_Systems - CST 8174 Computer...

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