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- From: btbg1194@uxa.cso.uiuc.edu (Bradley T Banko)
- Subject: Q-bus Murder Mystery ... (PDP11/73+)
- Message-ID: <Bt7Dx4.AvJ@news.cso.uiuc.edu>
- Sender: usenet@news.cso.uiuc.edu (Net Noise owner)
- Organization: University of Illinois at Urbana
- Date: Tue, 18 Aug 1992 23:43:50 GMT
- Lines: 39
-
- I know that this isn't the proper way to do things, but I am grasping at
- straws. We have a sick PDP11 system, which has been losing boards left
- and right... I suppose that the power supply would be a likely suspect, but
- I would like to outline the problem:
-
- This is a Q22 bus system with an expansion card cage (& supply).
-
- The system contains:
- KDJ11A CPU, MXV11B multi-function card, 4 Mb memory card,
- DHV11 8-line serial, DELQA ethernet card, a DRV11 parallel card,
- and Emulex (?) disk and tape controller cards.
-
- The first event was a death out of the blue of the DHV11... not quite sure
- what caused that. Upon getting a replacement DHV11 card, we installed it,
- and shortly thereafter both the DELQA and the CPU died. The CPU couldn't
- find the memory card (which is in the 2d slot), and when we put in a
- replacement CPU and then the "dead" DELQA, we got a bus failure during boot.
-
- Scene 3: New CPU, new DELQA card. CPU runs on the system without the DELQA
- card without a problem for two days... feeling lucky, we install a new
- DELQA card. Within 8 hours, both the DELQA and the CPU were dead... same
- symptoms. Now we have a 3d CPU card, and have given up on ethernet.
- For some reason, having both the ethernet card and the CPU in the system
- seems to cause a problem. Up to this point, the system has been running
- in this configuration for at least a year with minimal crashes.
-
- Does this pattern of failure sound familiar or suggest some obvious responses?
- (Please respond by email.)
-
- Thanks.
-
- Brad Banko
- b-banko@uiuc.edu
-
- --
- Brad Banko; Dept of Physics; U of Illinois; b-banko@uiuc.edu, KB8CNE
- =========================================================================
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