Int 21H, AH=15H

1 and higher

SEQUENTIAL WRITE TO FCB FILE

DosRead

      AH = 15h
      DS:DX -> opened FCB (see #01345)
      Disk Tranfer Area contains record to be written

AL = status

          00h successful
          01h disk full
          02h segment wrap in DTA

writes a record of the size specified in the FCB beginning at the
        current file position, then updates the current block and current
        record fields in the FCB
      if less than a full sector is written, the data is placed in a DOS
        buffer to be written out at a later time
      not supported by MS Windows 3.0 DOSX.EXE DOS extender
      

AH=0Fh,AH=14h,AH=1Ah,AH=40h,INT 2F/AX=1109h

Text based on Ralf Brown Interrupt List Release 61