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 (purchased
     from Network Products Corp, who call it NCSI) which runs on
     workstations; NACS is the NetWare Asynchronous Communications
     Services module which runs on servers

Notes: the installation check consists of testing for the signature string
     "NCSI" three bytes past the interrupt handler; see also AH=02h.
     As of version 3.0, Novell's NASI can be distinguished from NPC's
     NCSI by the presence of an 'A' immediately following the signature
   this function is also supported by TelAPI, NPC NCSI, and Connection
     Manager CLIENT.EXE; for TelAPI, nonzero values in AL specify a
     connection ID
   Connection Manager 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