PDP11/23+ Error code question

[Tony Duell]

> When the unit is powered up, there is no output to the terminal, and the
> processor fault LED's give a code of 14, which is listed as "Scope Loop" -
> does anyone know what this signifies?

The original meaning of 'scope loop' in DEC diagnostics was a tight loop 
that kept on accessing some failing piece of hardware so you could use a 
non-storage 'scope to debug it. 

I would assume, based on the fact it's code 14, that it's fairly early on 
in the power-on diagnostics of your 11/23+ system, and that there's 
smething fairly fuandamentally wrong with the CPU/memory/bus.

-tony