Int 14 Fn B0  - 3com Bapi Serial I/o - En/disable "enter Command Mode" (e  [S]

   AH = B0h
   AL = new state (00h disabled, 01h enabled)

Return: AH = return code (00h,07h,0Ah) (see AH=A0h"BAPI")

Note:  disabling the ECM character allows applications to send data which
     includes the ECM character

See Also: AX=AF00h"BAPI",AH=B1h,AH=B2h