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C/C++ Source or Header  |  1988-08-11  |  266 b   |  16 lines
  1. /* Listing 1-5 */
  2.  
  3. #include    "dos.h"
  4.  
  5. main()
  6. {
  7.     struct    BYTEREGS regs;        /* BYTEREGS defined in dos.h */
  8.  
  9.  
  10.     regs.ah = 0x0F;            /* AH=0x0F (ROM BIOS function number) */
  11.  
  12.     int86( 0x10, ®s, ®s );    /* perform interrupt 10h */
  13.  
  14.     return( (int)regs.al );
  15. }
  16.