void vr_synch(void) {

asm	mov	dx,3DAh;

vr1:

asm	in	al,dx;
asm	test	al,8;
asm	jne	vr1;

vr2:

asm	in	al,dx;
asm	test	al,8;
asm	je	vr2;

}
void mcga(void) {
  asm {
    mov   ax,  13h        // load the mode to the ax register
    int   10h              // interupt 10h
  }
}


long i(int x, int y) {
  return ((y * 320) + x);
}

void putpixel(int x_coordinate, int y_coordinate, char color) {

asm	mov	ax,0a000h;
asm	mov	es,ax;
asm	mov	di,[y_coordinate];
asm	mov	ax,[y_coordinate];
asm	shl	di,8;
asm	shl	ax,6;
asm   add	di,ax;
asm	add	di,[x_coordinate];
asm	xor	ax,ax;
asm	mov	al,[color];
asm	mov	[es:di],al;

}

void drawscreen(char *sbuffer) {
  vr_synch();
  for (int y = 0; y < 200; y++)
    for (int x = 0; x < 320; x++)
      putpixel(x, y, sbuffer[(y * 200) + x]);
}


void setpal(char r, char g, char b, char location) {

asm	push	dx;                     // save dx
asm	mov	dx,3c8h;		// 3c8h is the setting of the number
					// (0-255) in which the color will
					// be held in the pallette
asm     mov	al,[location];          // move the pallette location into al
asm	out	dx,al;			// output al to dx (3c8h)
asm	inc	dx;                     // increase dx to become 3c9h. This
					// is the setting that controls the
					// RGB values of the pallette number
asm	mov	al,r;			// move red value to al
asm	out	dx,al;                  // output al to dx, setting the red value
asm	mov	al,g;                   // move green value to al
asm	out	dx,al;                  // output al to dx, setting the green value
asm	mov	al,b;                   // move blue value to al
asm	out	dx,al;                  // output al to dx, settign the blue value
					// wh00p, all done!
asm     pop	dx; 			// put back dx

}