Program to write data in DMA Mode

void main()
{
clrscr();
union REGS regs;
int ans;
char arr[1000];

outp(0x3f2,0x1c); //Motor On
delay(200);
outp(0x3f5,0x0f); //Command Code
delay(200);
outp(0x3f5,0x00); //Command Code
delay(200);
outp(0x3f5,0); //Cylinder no.
delay(200);
outp(0x3f5,0x08); //Sense Interrupt Command
delay(200);

ans=inp(0x3f5); //Reading ST0 in data register
delay(100);
ans=inp(0x3f5); //pcn

cout<
delay(200);
outportb(0x12,0); /*initialization of DMA Mode*/
delay(200);
outportb(0x11,10); /*supplying Mode Byte*/

int ar=FP_OFF(arr);
int ar1=FP_SEG(arr);
outportb(0x10,2); /*supplying channel no. on port 10*/

regs.h.ch = (ar1)&(0x0f00);
regs.x.ax = regs.h.ah+ar;
(regs.h.ch)++;

outportb(0x04,regs.h.al);
delay(200);

outportb(0x04,regs.h.ah);
delay(200);
outportb(0x81,regs.h.ch);
delay(200);
outportb(0x05,1);
// DMA End

//READ command
delay(200);
outportb(0x3f5,46); //Command Code
delay(200);
outportb(0x3f5,0); //Command Code
delay(200);

outportb(0x3f5,0); //Cylinder no.
delay(200);

outportb(0x3f5,0); //Head Addr
delay(200);
outportb(0x3f5,3); //Record
delay(200);
outportb(0x3f5,2); //Sector size
delay(200);
outportb(0x3f5,5); //EOT
delay(200);
outportb(0x3f5,21); //GPL
delay(200);
outportb(0x3f5,10); //DTL

//result
delay(200);


// st0

int st0 = inportb(0x3f5);
printf("
st0 = %x",st0);
if(inportb(0x3f5) & (192)!=0)
{
printf("
st0= %d",st0);
cout<<"
Abnormal termination st0";
delay(200);
outp(0x3f2,0x0c); //Motor off
exit(0);
}

delay(200);

int st1 = inportb(0x3f5);
printf("
st1 = %x",st1);
if((st1=inportb(0x3f5)) !=0)
{
printf("
st1=%d ",st1);
cout<<"
Abnormal termination st1";
delay(200);
outp(0x3f2,0x0c); //Motor off
exit(0);
}

delay(200);

int st2 = inportb(0x3f5);
printf("
st2 = %x",st2);
if((st2=inportb(0x3f5)) != 0)
{
cout<<"st2= "<
cout<<"
Abnormal termination st2";
delay(200);
outp(0x3f2,0x0c); //Motor off
exit(0);
}

cout<<"
Successful Termination";
delay(200);

cout<<"
c= "<
delay(200);

cout<<"
h= "<
delay(200);

cout<<"
r= "<
delay(200);

cout<<"
n= "<
delay(200);

outp(0x3f2,0x0c); //Motor off

getch();

}

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