CS609 HANDOUTS FREE DOWNLOAD

Copyright Virtual University of Pakistan 3. CS Handouts 1 45 Download Report. Certain operating systems operate in protected mode. Handouts - St Mgmt Lecture 1 Documents. Standard PC operate in two mode in terms of memory which are Real Mode Protected Mode In real mode the processor can access only first one MB of memory to control the memory within this range the DOS operating system makes use of some data structures called FCB File control block PSP Program segment prefix We shall discuss how these data structures can be directly accessed, what is the significance of data in these data structures. Operating systems make use of some data structures or tables for management of computer resources.

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Certain operating systems operate in protected mode. Embed Size px x x x x Also we will see how the logical addresses can be translated into physical addresses using the information hansouts tables Viruses and Vaccines Once an understanding of the file system and the memory Management is developed it is possible to understand the working of viruses.

Handouts - St Mgmt Lecture 1 Documents.

The keyboard is not directly connected to CPU rather its connected to a keyboard controller and the keyboard controller is connected to the CPU.

Mostly viruses when activated would perform something hazardous. Copyright Virtual University of Pakistan 3. We will take up different functions of the operating systems and discuss how they are performed and how can the data structures used for these operations be accessed.

Published on Apr View Download 9. Moreover we will discuss techniques of how they can be removed and mostly handoits prevented to perform any infections. Also we will see how the logical addresses can be translated into physical addresses using the information these tables.

Standard PC operate in two mode in terms of memory which are Real Mode Protected Mode In real mode the processor can access only first one MB of memory to control the memory within this range the DOS operating system makes use of some data structures called FCB File control block PSP Program segment prefix We shall discuss how cd609 data structures can be directly accessed, what is the significance of data in these data structures.

CS Handouts 1 45 Download Report.

CS Handouts 1 45

This is done with the support of DMA controller. Operating systems Systems programming is not just the study of programmable hardware devices. In protected mode all handoyts the memory interfaced with the processor can be accessed. Memory management Memory management is another important aspect of operating systems.

While designing software the programmer may determine the required inputs for that program, the wanted outputs and the processing the software would perform in order to give those wanted outputs. Virus is a simple program which can embed itself within the computer resources and propagate itself. cs6609

To develop effective system software one needs to the internals of the operating system as well. The implementation of the processing part is associated with hadouts programming. This transfer time can be reduced bypassing the CPU as ports and memory device are also interconnected by system bus. There are various types of viruses but we will discuss those which embed themselves within the program or executable code which are Executable file viruses Partition Table or boot sector viruses VU Device Drivers Just connecting a device to the PC will not make it work unless its device drivers are not installed.

Computer programming can be categorized into two categories.

System Programming - CS VU Lectures, Handouts, PPT Slides, Assignments, Quizzes, Papers & Books

uandouts File Management File management is an important function of the operating systems. In the three layered approach if we are following the first approach we need to program the hardware.

Lecture 1What is Systems Programming? Device Drivers Just connecting a device to the PC will not ca609 it work unless its device drivers are not installed.

CS609 Handouts 1 45

This information can be used to traverse through the memory occupied by the processes and also calculate the total amount of free memory available. To understand the file structure the basic requirement is the understanding of the disk architecture, the disk formatting process and how this process divides the disk into sectors and clusters.

Operating systems in this mode make use of various data structures for memory management which are Local Descriptor Table Global Descriptor Table Interrupt Descriptor Table We will discuss the significance these data structures and the information stored in them. The DMA direct memory access controller can controller the buses and hence the CPU can be bypassed data item can be transferred from memory to ports or vice versa in a single bus cycle.

Three Layered Approach A system programmer may use a three layered approach for systems programming.

System Programming (CS609)

CSSystem Programming We will see where do they embed themselves and how can they be detected. Haneouts will discuss the integrated environment for the development of device drivers for DOS and Windows.

The operating system in turn will use BIOS routines or may program the hardware directly in order to perform the operation. Application programming facilitates the implementation of the required processing that software is supposed to perform; everything hnadouts is left now is facilitated by system programming.