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CS609 ASSIGNMENT 1 SOLUTION 2021.
Question No1
Solution Code
#include <dos.h> // for intdos() and union REGS
#include <stdio.h> // for printf ()
union REGS inregs, outregs;
void mian()
{
inregs.h.ah = 0x6;
inregs.h.al = 0x0;
intdos(&inregs, &outregs);
if(regs.x.cflag==1)
printf(“your Student here”);
else
printf(“your Name”);
getch();
}
Question No 2 CS609 ASSIGNMENT 1 SOLUTION 2021
Solution
#include <dos.h> // for intdos() and union REGS
#include <stdio.h> // for printf ()
union REGS regs;
void mian(void)
{
regs.h.al = 0x116;
regs.h.ah = 0x10;
printf(“%x”, regss.x.ax);
}
Output: 10116
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CS609 ASSIGNMENT 1 SOLUTION 2021
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CS609 ASSIGNMENT 1 SOLUTION 2021
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Methods of i/o. Inside the 3 layered technique if we are following the first technique we need to software the hardware. The hardware may be programmed to perform i/o in three approaches i.E. In case of programmed i/o the cpu constantly exams the i/o tool if the i/o operation may be performed or now not. CS609 ASSIGNMENT 1 SOLUTION 2021
If the i/o operations can be done the cpu performs the computations required to finish the i/o operation and on the other hand starts watching for the i/o tool so that you can carry out next i/o operation. On this way the cpu remains tied up and is not doing some thing else except waiting for the i/o device to be idle and performing computations only for the slower i/o device. In case of interrupt pushed the failings of programmed pushed i/o are rectified. CS609 ASSIGNMENT 1 SOLUTION 2021
The processor does now not take a look at the i/o tool for the capability of acting i/o operation as an alternative the i/o tool informs the cpu that it’s idle and it can perform i/o operation, as a end result the execution of cpu is interrupted and an interrupt provider ordinary (isr) is invoked which performs the computations required for i/o operation. After the execution of isr the cpu continues with some thing it became doing earlier than the interruption for i/o operation. CS609 ASSIGNMENT 1 SOLUTION 2021
On this way the cpu does no longer continue to be tied up and can carry out computations for different strategies while the i/o gadgets are busy performing i/o and therefore is greater most suitable. Normally it takes two bus cycles to transfer facts from some i/o port to reminiscence or vice versa if this is completed via a few processor sign up. This transfer time can be reduced bypassing the cpu as ports and memory device are also interconnected through system bus. This is accomplished with the assist of dma controller. CS609 ASSIGNMENT 1 SOLUTION 2021
The dma (direct memory get admission to) controller can controller the buses and as a result the cpu may be Bypassed facts item can be transferred from memory to ports or vice versa in a single bus cycle. CS609 ASSIGNMENT 1 SOLUTION 2021