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What is a system call?
A system call is a request made through any program to the operating system for performing tasks, picked by a predefined set, that the said program doesn't have needed permissions to execute into its individual flow of execution. System calls give the interface between the operating system and a process. Most operations interacting along with the system need permissions not available to a user level process, for example: input and output performed with a device present in the system or any form of communication along with other processes needs the use of system calls.
Draw and elucidate the block diagram of programmable interrupt controller 8259. The 8259A adds 8 vectored priority encoded interrupts to microprocessor. It can be expanded to 6
interrupt method in keypad operation coding using PIC16
Q. Explain about Workstations? The workstations are used for engineering applications like CAD/CAM or other types of applications which need a moderate computing power and rela
Question 1: a) The aim of a computer network is to increase efficiency and reduce costs. Describe how networks achieve the above. b) Explain briefly how the bus topology op
What is SISD? Single Instruction stream, Single Data stream (SISD) shows the organization of a single computer having a control unit, a processor unit, and a memory unit. Inst
Explain about the Public Key Cryptography. Public Key Cryptography: It is a cryptographic system which uses two keys as a public key identified to everyone and a private
Write a short note on pointer declaration A simple variable in a program is stored in a certain number of bytes at a particular memory location, or address, in the machine. Poi
Propositional model: Hence a propositional model was simply an assignments of truth values to propositions. In distinguish, a first-order model is a pair (Δ, Θ) where
What is meant by scan code? When a key is pressed on the keyboard, the keyboard controller places a code take to the key pressed into a part of the memory known as the keyboar
Explain with the help of examples FIFO algorithms? FIFO policy: This policy easy removes pages in the order they arrived into the main memory. By using this policy we easily
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