static void near ourdummy (void) {}

static unsigned near ourreadtimer (void)
{
  asm pushf
  asm cli
  asm mov  al,0h
  asm out  43h,al
      ourdummy();
  asm in   al,40h
  asm mov  bl,al
      ourdummy();
  asm in   al,40h
  asm mov  bh,al
  asm not  bx
  asm popf
  return( _BX );
}

void outw(unsigned port, unsigned val)
{
asm     mov     dx, port
asm     mov     ax, val
asm     out     dx, ax
}

void outb(unsigned port, unsigned char val)
{
asm     mov     dx, port
asm     mov     al, val
asm     out     dx, al
}

unsigned inw(unsigned port)
{
asm     mov     dx,port
asm     in      ax,dx
        return _AX;
}

unsigned char inb(unsigned port)
{
asm     mov     dx,port
asm     in      al,dx
asm     xor     ah,ah
        return _AX;
}

void busdelay(void)
{
    unsigned stop;
    unsigned cur, prev;

    stop = (prev = ourreadtimer()) + (20);

    while ((cur = ourreadtimer()) < stop)
        {
        if (cur < prev)
            {
            if (stop < 65535)
                break;
            stop -= 65535;
            }
        prev = cur;
        }
}


int kbpressed( void )
{
asm     mov     ah, 0Bh
asm     int     21h
asm     cbw
return( _AX );
}

int getchr(void)
{
  _AX = 0x0700;
  asm int 21h
  _AH = 0;
  return _AX;
}