The kernel reacts to services calls from the processes and interrupts from the gadgets. The center of the operating system is the kernel, a control program that capacities in special state (an execution connection that permits all equipment guidelines to be executed), responding to hinders from peripheral devices.and to service request and traps from processes. For the most part, the kernal is a lasting inhabitant of the PC. It makes and ends processes and reacts to their solicitation for services. Operating Systems are resource managers.
Chapter 4: Operating Systems A computer is divided into hardware and software. Hardware is referred to any physical component of a computer system such as monitor, mouse, and hard drive. Software is a collection of instructions that allow the user to interact with a computer and perform tasks such as Internet browser, email programs/applications, and antivirus software. Similarly, an operating system is a software program that allows computer hardware to communicate and work with computer software. We Will Learn: • What is an Operating System?
Software is a collection of programs or sequence of instructions given for changing the state of the computer hardware in a certain manner.. 15.2.1 System Software Systems software is the class of programs that control and support the computer system and its information-processing activities. Systems software also facilitates the programming, testing, and debugging of computer programs. It is much more powerful or efficient as compared to application programs and is usually independent of any type required applications Systems software programs helps to support application softwares which runs on it by the user directions. For example, when the computer is turned on, the initialization system program (an Operating systems program) prepares and readies all devices for processing. 15.3 System Control Programs System control programs helps to control the actvities of the hardware, software, and various data re-sources of a computer system.
(9 marks) 3. Discuss the following types of operating systems. - Multi tasking - Multi processing - Multi user - Real time (12 marks) 1. 3 functions of operating systems are as follow: a) Manage the computer resources such as central processing unit, memory, disk drives and printer. In other words it acts like a translator which allows the application software to communicate with the computer hardware.
· Memory Management · This defines how memory is allocated to specific tasks, and how memory is protected from other processes. · Device Interface · Device interfaces define the nature of the peripherals which may be connected to a system, the ease with which new devices are added, the extent to which the full power of a device may be used, and how knowledgeable user programs have to be to work with that device. · File System · The design of the file system is often so closely linked to the kernel design that is often the first indicator of differences between similar operating systems. This can include such simple clues as how files are named, or how directories or folders are named. · Degree of Integration · While some systems attem... ... middle of paper ... ...iles (password, group files) /tmp area for temporary storage, usually cleaned up after reboots, never store important files here Hard Drives, Partitions, CDROM, Network Drives, … · In other operating systems (DOS, Windows, Mac, OS/2) second hard drives, partitions, CDROMS, and network drives are displayed as a separate folder at the same level as the main drive (i.e.
It controls and co-ordinates the systems operations. This contains the system clock, program counter and the instruction register. It also manages the signals from the control bus. Registers --------- This is a form of high-speed memory which is contained inside of the CPU. All data must be represented in a register before it can be processed.
ALU Let me start off with some background information of the ALU. The Arithmetic Logic Unit (ALU) is a digital circuit which performs arithmetic and logic operations. It does basic arithmetic such as addition, subtraction, multiplication, and division. The ALU also has the ability to do logic operations, such as OR, AND, NOT, and many others. The ALU is what does most of the operations that a Central Processing Unit (CPU) does.
SOFTWARE A set of instructions that directs a computer's hardware to perform a task is called a program, or software program. Software comprises the entire set of programs, procedures, and routines associated with the operation of a computer system. The two main types of software are system software and application software. System software controls a computer's internal functioning, chiefly through an operating system , and also controls such peripherals as monitors, printers, and storage devices. Utilities and compilers are also parts of system software.
The operating system is an example of an system software, although on closer inspection, it is actually composed of various system software necessary for the computer. These tasks include registry editing, writing files to storage, allocation of resources to different applications and Graphic user interface for the Users to navigate. 7. CPU- The Central Processing Unit of the computer. It is one of the three most important hardware needed for the computer to run.
Systems proframmers write programs to maintain and control compuet systems, and database systems. Systems programmers make changes in the sets of instruction that determines how a system will handle the jobs it its given. They also help applications programmers find errors in there programs. Their programs have to work with a variety of operating systems. Programmers are known by the language they program or the envirnment in which they work.