The Convert Binary Text to Unsigned Integer routine converts an
    ASCII text string representation of an unsigned binary value to
    an unsigned integer value. The integer value can be of arbitrary
    length but is typically a byte, word, longword, or quadword. The
    default size of the result is a longword.

    Format

      OTS$CVT_TB_L  fixed-or-dynamic-input-string

                    ,varying-output-value [,output-value-size]

                    [,flags-value]