Int 6B Fn 0000  - Novell Nasi/nacs, Ungermann-bass Net One Serial I/o - B  [S]

   AX = 0000h
   CX = length
   ES:BX -> buffer

Return: CX = number of bytes written
Program: NASI is Novell's NetWare Asynchronous Services Interface which runs
     on workstations; NACS is the NetWare Asynchronous Communications
     Services module which runs on servers

Notes: this function is also supported by TelAPI and NPC NCSI; for TelAPI,
     nonzero values in AL specify a connection ID
   this function is also supported by Connection Manager CLIENT.EXE; it
     provides the signature string "NCSI" three bytes past the interrupt
     handler, and returns CF set/AL=FFh if called while an INT 6B call is
     already in progress

See Also: AX=0100h,AH=18h,INT 14/AH=19h,INT 14/AH=E3h