INT 14 - 3com BAPI SERIAL I/O - GET ECM WATCH STATE
        AH = B2h
Return: AH = return code (00h,07h,0Ah) (see AH=A0h"BAPI")
        AL = watch flag (00h disabled, 01h enabled)
Desc:   determine whether the ECM character is enabled
SeeAlso: AH=B0h,AH=B1h

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