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  Interrupt:   21h     Function:   48h
 
  Title:       Allocate Memory Block
 
  See also:    Release Memory Block, Resize Memory Block,
               Get or Set Allocation Strategy, @GetBlock
 
  Description:
 
     Allocates a block of memory and returns a pointer to the beginning
     of the allocated area.
 
     Input                         Output
 
     AH = 48h                      If function successful
     BX = Number of paragraphs       Carry flag: clear
          of memory needed           AX = Initial segment of allocated
                                          block
 
                                   If function unsuccessful
                                     Carry flag: set
                                     AX = Error code (07h or 08h)
                                     See: ◄Error codes►
                                     BX = Size of largest available
                                          block (paragraphs)
                                    -♦-