/* example 28-1A using 16-bit registers */
       #include <dos.h>                /* int86 is part of this library */
       main()
       {
       union REGS regin,regout;                 
       regin.x.ax=0x0600;                      /* MOV AX,0600H         */
       regin.h.bh=0x07;                        /* MOV BH,07H   */
       regin.x.cx=0;                           /* MOV CX,0             */
       regin.x.dx=0x184F;                      /* MOV DX,184FH         */
       int86(0x10,&regin,&regout);             /* INT 10H              */
       }