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C/C++ Source or Header  |  1985-08-06  |  256 b   |  11 lines
  1. #include <dos.h>
  2. defdrv()
  3. {
  4.   int i;
  5.   union REGS reg;
  6.   reg.h.ah = 0x19;
  7.   int86(0x21,®,®);
  8.   i = reg.h.al;
  9.   return(i);
  10. }
  11.