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  Interrupt:   21h     Function:   15h
 
  Title:       Sequential Write
 
  See also:    Write to File or Device
 
  Description:
 
     Writes the next sequential block of data into a file and then
     increments the file pointer appropriately.
 
     Input                         Output
 
     AH = 15h                      AL = 00h (if write successful)
     DS:DX = segment:offset of        = 01h (if disk full)
             previously opened        = 02h (if segment wrap)
             file control block
                                    -♦-