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Answer of Q.No.01

#include <dos.h>

 #include <bios.h>

 char st[100];

 unsigned long int temp;

 unsigned int i;

 unsigned int count=100;

void main (void)


 temp=(unsigned long int)_DS;

 temp = temp 4L;

 i = *((unsigned int *)(&temp));

 temp = temp>>16L;

outportb (0x83,*((unsigned char *)(&temp)));

 outportb(0x02,*(((unsigned char *)(&i))));

 outportb(0x02,*(((unsigned char *)(&i))+1));


 outportb(0x03,*((unsigned char *)(&count)));

 outportb(0x03,*(((unsigned char*)(&count))+1));






Answer of Q.No.02

The required function is given below:

if(BPB_FATSz16 != 0)




 if(BPB_TotSec16 != 0)

 TotSec = BPB_TotSec16;


 TotSec = BPB_TotSec32;

DataSec = TotSec – (BPB_ResvdSecCnt + (BPB_NumFATs * FATSz) + RootDirSectors);

CountofClusters = DataSec / BPB_SecPerClus;

if(CountofClusters < 4085)

 /* Volume is FAT12 */

else if(CountofClusters < 65525)

 /* Volume is FAT16 */


/* Volume is FAT32 */

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Replies to This Discussion

ye thk h 2nd wala

is this correct


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