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  Include:   DOS.INC
 
  Syntax:    @FreeBlock [segment]
 
  Summary:   Frees a block of memory
 
  Argument:  <segment>     Starting address of memory to be freed; if
                           none given, ES address assumed
 
  Returns:   If carry: set, error code in AX
 
  Modifies:  AX; ES if segment given
 
  See also:  Int 21h Function 49h, @GetBlock, @ModBlock
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