The SYSMAN IO SHOW DEVICE command displays information about the
    device drivers loaded into the system, the devices connected to
    them, and their I/O databases.

    The SYSMAN IO SHOW DEVICE command specifies that the following
    information be displayed about the specified device driver:

    Driver   Name of the driver
    Dev      Name of each device connected to the driver
    DDB      Address of the device's device data block
    CRB      Address of the device's channel request block
    IDB      Address of the device's interrupt dispatch block
    Unit     Number of each unit on the device
    UCB      Address of each unit's unit control block

    All addresses are in hexadecimal and are virtual.

    For additional information about SYSMAN, see A Comparison of
    System Management on OpenVMS AXP and OpenVMS VAX (archived) but
    available on the OpenVMS Documentation CD-ROM) and the HP OpenVMS
    System Manager's Manual.