1. Lecture 24

2. DMA Request Register

3. DMA Mask–1 Register

4. DMA Mask–2 Register

5. DMA Mode Register

6. Setup & Query of DMA Channels

7. High Address Nibble/Byte

8. #include <dos.h>
#include <bios.h>
char st[80];
unsigned long int temp;
unsigned int i;
unsigned int count=48;
void main (void) {
temp=(unsigned long int)_DS;
temp = temp << 4L;
i = *((unsigned int *)(&temp));
temp = temp>>16L;

9. outportb (0x81,*((unsigned char *)(&temp)));
outportb(0x06,*(((unsigned char *)(&i))));
outportb(0x06,*(((unsigned char *)(&i))+1));
count--;
outportb(0x07,*((unsigned char *)(&count)));
outportb(0x07,*(((unsigned char*)(&count))+1));
outportb(0x0b,0x0b);
outportb(0x08,0);
outport(0x0a,3);
getch(); }