no vector support - command cannot be performed

    Facility: DEBUG, VMS Debugger

    Explanation: An attempt was made to modify vector state on a
    system which has neither hardware vector capabilities nor the
    VVIEF. This includes the EXAMINE vector-register, DEPOSIT vector-
    register, and SET VECTOR_MODE commands.

    User Action: Do not attempt to modify vector state on a system
    which does not have vector capabilities.