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In a memory hierarchy system, data and programs are first stored in secondary or auxiliary memory. Program and its related data are brought in main memory for execution. What if the size of Memory needed for Program is more than the size of memory? Virtual memory is a idea used in some large computer systems which allow user to construct programs as though a large memory space were available, equal to total of secondary memory. Every address produced by CPU goes through an address mapping from so-called virtual address to a physical address in main memory. Virtual memory is employed to give programmers the illusion that they have a very large memory at their disposal although computer in fact has a relatively small main memory. A Virtual memory system offers a mechanism for translating program-generated addresses in correct main memory locations. This is done dynamically whereas programs are being executed in CPU. The translation or mapping is handled automatically by hardware through a mapping table.
The digital circuits that we use now-a-days are constructed with NOR or NAND gates in place of AND-OR-NOT gates. NOR & NAND gates are known as Universal Gates as we can realize any
Design issues: To complete the maximum processor utilization in a multithreaded architecture, the following design issues have to be addressed: Context Switching time: S
Biscuits move on a conveyer through an oven where they are cooked. Two sensors, H and C, measure the temperature of the oven, H = 1 if the oven is too hot and C = 1 if the ove
Micro-Operations A micro-operation is an basic operation which is performed on data stored in registers. We can classify micro-operations into four categories: 1. Register t
Explain POP (Post Office Protocol). The Post Office Protocol gives remote access to an electronic mail box. The protocol permits a user's mailbox to reside on a computer which
Read only memory (ROM) ROM holds the instructions for starting up the computer. This sort of memory can only be read and can't be altered (that implies deleted or written to) a
Differentiate between protected and real modes of an Intel microprocessor Operation of Real mode interrupt: When microprocessor completes executing the current instruction, it
Types of Pipelines: Instructional pipeline It is used where different stages of an instruction fetch and execution take place in a pipeline. Arithmetic pipeline
what is waterfall model
Face Scanning Security System - Biometric Computer Security Systems Finally, face scanning security system are also one of biometric technologies. Generally, the principle of
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