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 _bios_memsize()         Reports size of system memory

 #include   <bios.h>

 unsigned   _bios_memsize(void);

  _bios_memsize();       uses ROM-BIOS interrupt 12h to determine the total
                         amount of system memory.

    Returns:    The total number of installed 1k memory blocks available
                to the system (up to 640k).

      Notes:    This is the amount of memory available to the entire
                system. This is not the amount of memory available to the
                user's program.

                If RAM disks or print spoolers are installed some memory
                may be hidden from the system, in which case
                _bios_memsize() will report the amount of memory the
                system sees, which is less than the actual installed
                memory.

                On PC's and XT's this service determines memory by
                examining the DIP switches on the system board. If the
                switches are set incorrectly _bios_memsize() will return
                an incorrect value.

 Portability:   MS-DOS and true PC compatibles only.

-------------------------------- Example --------------------------------
 This program reports the total amount of available system memory.

           #include <bios.h>

           main()
           {
              unsigned memsize;
              memsize = _bios_memsize();
              printf ("\nThere are %uK bytes of memory", memsize);
              printf (" available to MS-DOS and user programs");
           }