pdp8/11 console cable pinouts

From: John Lawson <jpl15_at_netcom.com>
Date: Mon Dec 27 18:59:42 1999

On Mon, 27 Dec 1999, Dave McGuire wrote:

>
> Excellent, thank you! At this point I've got it cleaned up and cabled...It
> doesn't seem to want to spin up though. No fault or anything, just no spindle
> motor activity. The door locks, the "load" lamp goes out, and then nothing. I


 Last time I had this problem on my 11/34a with the RK05s... I
traced it to DCLO negated. After much further detective work, and
with no small amount of assistance from Tony D and Allison et al., I
found the problem in my case to be the BC11 cable from the Unibus to
the drive electronics reversed at the drive end. Of course it *will*
go in backwards if coerced, and, as you well know... the RK05
electronics are not the sine qua non of accessability. Mine are low
in the rack and I had to lie on my back with a flashlight in my
teeth to work on the unit.... You can imagine the impolite things I
called myself when the trouble came to light. At least I got a good
tour of RK05s and How They Work.

  Good luck.

John
Received on Mon Dec 27 1999 - 18:59:42 GMT