Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 21h Function 28h
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  Interrupt:   21h     Function:   28h
 
  Title:       Random Block Write
 
  See also:    Write to File or Device
 
  Description:
 
     Writes one or more sequential records from memory to a file,
     starting at a designated file location.
 
     Input                               Output
 
     AH = 28h                            AL = 00h (if all requested
     CX = Number of records to write               records written)
     DS:DX = segment:offset of              = 01h (if disk full)
             previously opened file         = 02h (if segment wrap)
             control block               CX = Actual number of records
                                              written
                                    -♦-