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  Interrupt:   21h     Function:   49h
 
  Title:       Release Memory Block
 
  See also:    Allocate Memory Block, @FreeBlock
 
  Description:
 
     Releases a memory block and makes it available for use by other
     programs.
 
     Input                        Output
 
     AH = 49h                     If function successful
     ES = Segment of block to       Carry flag: clear
          be released
                                  If function unsuccessful
                                    Carry flag: set
                                    AX = Error code (07h or 09h)
                                    See: ◄Error codes►
                                    -♦-