CIT 333
Operating System
Chapter 1 : Computer System Structure
DAE Computer Information Technology | Third Year
Short Questions
An operating system is a program that acts as an interface between the user and the computer hardware and controls the execution of all kinds of programs. It enables the computer hardware to communicate and operate. DOS and Windows example of OS.
Computers perform a wide range of operations, but at a high level, the general operations of a computer can be broken down into four main stages: input, processing, output, and storage.
An interrupt is a signal sent to the CPU by an external device, such as a keyboard or mouse, to temporarily halt the normal processing of a program and redirect the CPU's attention to a specific task or event.
In an operating system, I/O interrupts are signals generated by external devices to the CPU to indicate that they require attention or have completed an operation. When an I/O interrupt occurs, the CPU interrupts its current task and switches to an interrupt handling routine to service the interrupt.
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