help needed: problem with UNIBUS access on my PDP-11/70 - test-drb@ccmp.vtda.org

15 Jul 2002

  Hi Eric.

Yes, very strange indeed.
The G7273 is placed in slot positions C & D, the correct way.
Edward suggested to use the Ohmmeter and check for a very fine
disconnect on the etch of the G7273. The etched wire is indeed
quite thin, I remember from yesterday.
We'll see this evening ...

- Henk.

...
  -----Original Message-----
 From: Eric Smith [mailto:eric@brouhaha.com]
 Sent: dinsdag 16 juli 2002 10:43
 To: cctalk(a)classiccmp.org
 Subject: RE: help needed: problem with UNIBUS access on my PDP-11/70

  However ... (I will check this again)
 RX11 in slot 41 --> hung and we know why.
 RX211 in slot 41 --> all OK and we know why.
 G7273 double grant in slot 41 --> THE HUNG IS BACK!  Huh??  
 Very strange.  You've got the G7273 in the right slots (C&D)?  And
 not upside-down?  If it's inserted correctly, it can't help but pass
 the grants through! 