Shoot, already enabled.  Gonna have to dive deeper.  Thanks for the idea though, Noel!

On Tue, May 19, 2020 at 2:50 PM Noel Chiappa <jnc@mercury.lcs.mit.edu> wrote:
    > From: Jacob Ritorto

    > I had a suspicion that maybe the clock isn't working on the 11/73.
    > Would that make sense?

Would definitely explain the symptoms.

    > Maybe I have to check jumpers on the 11/73 to be sure its clock is
    > enabled?

There is a jumper on the KFJ11-A that enables/disables the clock&register;
W9 (closest to the handles) should be removed to enable the clock.

(I really need to add the jumpers to the KDJ11-A page on the Computer History
Wiki, mumble....)

      Noel