PDP-11/45 RSTS/E boot problem

Paul Koning paulkoning at comcast.net
Mon Feb 4 12:34:59 CST 2019

> On Feb 4, 2019, at 12:18 PM, Bob Smith via cctalk <cctalk at classiccmp.org> wrote:
> I keep wondering about the psu. I just recall the /45 in my lab was
> always a little flakey.
> We suspected everything in the machine, and it was ak to chasing a sea
> bat in the dark.

Good theory.

In RSTS development we once ran into DMC-11s not working reliably.  The field service tech knew exactly what to look for, and started checking all the supply voltages.  The spec says allowed tolerances are +/- 5%.  He knew the reality for correct operation was -0%, +5%, so he tweaked all the supplies to read a hair above nominal.

Is there any way to attach a logic analyzer to various data paths on this machine?


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