Library /sys$common/syshlp/dbg$help.hlb DEBUG, MONITOR, Qualifiers, /ASCII  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /ASCII:n

    Interprets and displays each monitored entity as an ASCII string
    of length n bytes (n characters). If you omit n, the debugger
    attempts to determine a length from the type of the address
    expression.