Table of Contents
CS609 MIDTERM SOLVED PAPERS
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The dictionary definition of a system is “a set of things working together as parts of a mechanism or an interconnecting network.” This is a pretty apt way of thinking about systems as they pertain specifically to the IT world. A computer system is a collection of components (both hardware and software) that function as a part of a whole.
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System programming involves designing and writing computer programs that allow the computer hardware to interface with the programmer and the user, leading to the effective execution of application software on the computer system. Typical system programs include the operating system and firmware, programming tools such as compilers, assemblers, I/O routines, interpreters, scheduler, loaders and linkers as well as the runtime libraries of the computer programming languages.
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Typical system programs include the operating system and firmware, programming tools such as compilers, assemblers, I/O routines, interpreters, scheduler, loaders and linkers as well as the runtime libraries of the computer programming languages.
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Architecture is the conceptual model that defines the system structure and behavior. This is often represented graphically through the use of flowcharts that illustrate how the processes work and how each component is related to one another.
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A system programmer may use a three layered approach for systems programming. As you can see in the figure the user may directly access the programmable hardware in order to perform I/O operations.
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In this case the BIOS programs the hardware for required I/O operation which is hidden to the user. In the third case the programmer may invoke operating systems (DOS or whatever) routines in order to perform I/O operations. The operating system in turn will use BIOS routines or may program the hardware directly in order to perform the opera