Int 6B Fn 0100  - Novell Nasi/nacs, Ungermann-bass Net One Serial I/o - B  [S]

   AX = 0100h
   CX = length of buffer
   ES:BX -> buffer

Return: CX = number of bytes read

Note:  also supported by TelAPI and NPC NCSI; for TelAPI, nonzero values in
     AL specify a connection ID

See Also: AX=0000h,AH=19h,INT 14/AH=18h,INT 14/AH=E2h,INT 14/AX=FF02h