INT F1 - AQUEDUCT, PIPELINE - GET DATA AREA ADDRESS
Return: AX:BX -> data area
Notes:  AQUEDUCT and PIPELINE are TSRs by James W. Birdsall to connect COM1
          and COM2 in software
        The installation check consists of testing for the following signature
          immediately preceding the interrupt handler: "JWBtvv" where 't' is
          either "A" for AQUEDUCT or "P" for PIPELINE and "vv" is a two-digit
          version number