Int 14 Fn A4  - 3com Bapi Serial I/o - Write Block                         [S]

   AH = A4h
   CX = length of buffer in bytes
   DH = session ID (00h for external session managment)
   ES:BX -> buffer containing data

Return: AH = return code (00h,01h,03h,07h,0Ah,0Bh) (see #0320)
   CX = number of bytes actually sent

See Also: AH=19h,AH=86h,AH=A0h"BAPI",AH=A5h"BAPI"