Technical Questions

Hardware device that maps virtual to physical address. In MMU scheme, the value in the relocation register is added to every address generated by a user process at the time it is sent to memory.

->The user program deals with logical addresses; it never sees the real physical addresses

#include "dos.h"

main()

{

    Char far *scr = ( char far *) 0xB8000000;

    Char *seg, *off;

    Seg = (char *) FP_SEG ( scr );

    Off = ( char *) FP_OFF ( scr );

}

An interrupt that can be turned off by the programmer is known as Maskable interrupt.

In 8086 Carry flag, Parity flag, Ausiliary carry flag, Zero flag, Overflow flag, Trace flag, Interrupt flag, Direction flag, and Sing flag.

In Windows NT, executive refers to the operating system code that runs in kernel mode.

TRUTH TABLE FOR HALF ADDER

A    B  SUM  CARRY

0    0    0         0

0    1    1         0

1    0    1         0

1    1    0         1

INPLEMENTATION:

For SUM, The two inputs A and B are given to XOR gate.

For Carry, The two inputs A and B are given to AND gate.

Configuration Management is a support for software in managing the different items in the product, and changes in them.

In a multiprocessor system there exist several caches each may containing a copy of same variable A. Then a change in one cache should immediately be reflected in all other caches this process of maintaining the same value of a data in all the caches s called cache-coherency.