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                                dos_calloc

   Usage
   include <dos.h>
   unsigned dos_calloc(unsigned para);

   Description
   Allocates  memory  from  the  heap  by a  direct  call  to  MSDOS.  If
   successful,  the  allocated memory is cleared (all  bytes  zero).  The
   argument para contains the number of  paragraphs required. Use:
   bytes_required/16

   Memory allocated with dos_calloc should be freed using dos_free only.

   Example

   See that for dos_alloc.

   Return Value
   If  successful dos_calloc returns the segment of the allocated  block,
   otherwise  zero  is  returned and _doserrno is set to  the  DOS  error
   number.