Int 14 Fn A3  - 3com Bapi Serial I/o - Read Character                      [S]

   AH = A3h
   DH = session ID (00h for external session managment)

Return: AH = return code (00h,02h,03h,07h,0Ah,0Bh) (see #0320)
   AL = character read or 00h if none available

See Also: AH=A0h"BAPI",AH=A2h"BAPI",AH=A5h"BAPI",AH=A7h"BAPI"