Wandering further afield for a moment, I just want to point out that the KI-10
at Living Computer Museum has 2 sets of serial lines. The publicly accessible
ones run at 9600bps via a DN87 connected to a DL10; the others, used for admin
connections internally, run at 2400bps through a DC10A/DC10F. The course
materials on DN87 etc. were a lifesaver.
Rich