Well, thanks to persistance, patience, and people on this list, I
finally fix'ed the vile beast's problems.
Okay, the last step was entirely ignorance on my part, as a timely
call from Paul Anderson this afternoon pointed out my folly:
I didn't know that the CPU was supposed to come up in a RUN mode - I
thought you had to start it.
He had me halt and start the CPU and run a branch-self, it just
looped like it was supposed to.
I now get the console, emulator, so a running OS isn't far off.
I've got two SLUs - anyone know if there's TU58 diag images around? :)
*sigh*
If there's any hobby where ignorance isn't bliss, it's this one.
Thanks again to everyone who assisted!