When i type show version on Our Catalyst 6509 it displays version NmpSW: 7.6 <1> copyright(c) 1995-2003 Bootstrap version 5.3<1> Hardware Version 2.0. It will not allow me to do the normal commands that I am use to like config t or copy running-config startup-config. I even tried to save using the write commands but was unable to do so. Any hints