Library /sys$common/syshlp/sysgen.hlb CONNECT, Qualifiers, /ADAPTER  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /ADAPTER=adapter-spec
       /NOADAPTER

    Specifies the nexus number (SBI arbitration line) or slot number
    of the adapter to which the device is connected. The nexus
    number can be found by using the SYSGEN command SHOW/ADAPTER
    or SHOW/BUS.

    /NOADAPTER specifies that the I/O driver does not handle a
    physical device, rather it is a pseudo or test device driver.

                                 CAUTION

       The system does not perform complete error checking on the
       CONNECT/ADAPTER=adapter-spec command. An incorrect vector
       address or misspelled device name, for example, can damage
       the I/O database and usually causes the system to fail.
       The OpenVMS VAX Device Support Manual has more information
       about loading device drivers and connecting devices. (This
       manual has been archived but is available on the OpenVMS
       Documentation CD-ROM.)