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Why do we need Registers?
If tcpu is cycle time of CPU which is the time taken by CPU to execute a well-defined micro-operation employing registers and tmem is memory cycle time which is the speed at which memory can be accessed by CPU then (tcpu/tmem) is in the range of 2 to 10 i.e. CPU is 2 - 10 times faster than memory. So CPU registersare the fastest temporary storage areas. So the instructions whose operands are stored in fast CPU registers can be executed fast in comparison to instructions whose operands are in main memory of a computer. Every instruction should designate the registers it will address. So a machine needs a large number of registers.
Figure: CPU with general register organisation
What are the features of PROM? They are programmed directly by the user. Faster Less expensive More Flexible
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A UNIX device driver is ? Ans. A UNIX device driver is structured in two halves termed as top half and bottom half.
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An EFI boot manager is also used to select and load the operating system, removing the require for a dedicated boot loader mechanism
In using COBOL on PC we have only flat files and the programs can access only limited storage, while in VS COBOL II on M/F the programs can access up to 16MB or 2GB depending on th
Define clock rate? The clock rate is given by, R=1/P, where P is the length of single clock cycle.
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What is the difference between Reply-to and Return-path in the headers of a mail function? Ans) Reply-to: Reply-to is where to deliver the respond of the mail. Return-pat
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