INT 2C PU - RM386 v6.00 - CLOAKING - GET TRAPPING STATE OF SPECIFIED PORT
        AX = 0030h
        DX = port number
Return: CF clear if successful
           BX = current state (0000h not trapped, 0001h trapped)
        CF set on error (port out of range or reserved)
SeeAlso: AX=002Eh,AX=002Fh

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