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   bdos

   Usage
   #include <dos.h>
   int bdos(int func, unsigned DX, unsigned AL);

   Description
   The  bdos  function calls a DOS function (int 21h) where func  is  the
   function number and DX and AL are the values to be loaded into the  DX
   and  AL registers prior to the function call. DOS function  calls  are
   used  to  access  the facilities of the operating system.

   Some system calls require registers other than DX and AL to  be set up
   and therefore bdos cannot be used. In such cases use the intdos
   function.

   Example
   #include <dos.h>
   main()
   {
        bdos(2,'C');   /* display the letter C */
   }

   Return Value
   Returns the value in AX after the system call.