11/34a issues - test-drb@ccmp.vtda.org

8 Nov 2005

  Hi Julian,

Ethan gave a very good description of the BR (4-5-6-7) and the NPR
wires. As he mentioned, try getting G7273's, and not just 2.
I have 10 of them, and currently (in the 11/34 with problems),
I removed all not needed boards in the CPU backplane. Then you
need 6 of those G7273 *if* you are not sure in which slot the NPR
wire is cut on the backplane.
If you are sure that the NPR wire is intact, you can put in a simple
G727, but you will find out soon why they are called knockle-busters.
So I prefer G7273's.  BTW, the NPR wire runs from pin CA1 to pin CB1,
so that is position C. The G7273 goes into positions C-D, the small
G727 goes into position D.

If you need more info, ask. But there are a lot of people on this
list that sure know more than I do!

I have no experience with a core-based 11/34, but if the core is Ok,
that does not matter if it is core-based or DRAM-based memory.
One thing though, the core-11/34 has a different power supply brick
installed. +20V is my guess, but then again, no experience with
core-11/34's.

I see from you board description that youi have an M7800 installed
in the third slot. I assume that it is the console.
You must check (at least) 2 things.
1) the jumpers/DIPswitches. Is it configured for console?
2) check the components near the BERG connector. Do you see 1448/1449?

AFAIK, depending short loops on the BERG plug you make an RS-232 or
a 20 mA current loop connection ... needless to say that a standard
RS-232 connection on a term inal will not work with a 20 mA loop fromn
the M7800 ...
I have (at home) a note that uses the keypad to get a character on
the screen (via the console configured board) and read a character
on the 11/34 display when you hit a key on the keyboard of the terminal.
It is simple, you should be able to figure it out yourself :-)

- Henk, PA8PDP.

...
  -----Original Message-----
 From: cctalk-bounces at classiccmp.org 
 [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Julian Wolfe
 Sent: dinsdag 8 november 2005 23:19
 To: 'General Discussion: On-Topic and Off-Topic Posts'
 Subject: RE: 11/34a issues

 Is there any good way to test the unit piece by piece?

 Also, I noted in the manual, it says BUS ERR only denotes a 
 bus error on the console, not on the processor, whatever that means.

 I have now confirmed that my grant cards are in correctly 
 (facing the correct direction).

 When is it exactly that I need a grant card?  Do I need them 
 whenever position D isn't occupied?  Or is there a 
 stipulation to that?

 I'm thoroughly confused.

 Mind you, I have not yet connected a console to it.  Maybe 
 I'll do that tonight.

 Henk (or anyone else) if you can offer further assistance 
 with this, I'd really appreciate it.

 TIA
 Julian

 -----Original Message-----
 From: cctalk-bounces at classiccmp.org 
 [mailto:cctalk-bounces at classiccmp.org]
 On Behalf Of Gooijen, Henk
 Sent: Thursday, November 03, 2005 5:22 AM
 To: General Discussion: On-Topic and Off-Topic Posts
 Subject: RE: 11/34a issues

   Hi Julian,

 you have at least response from the console ... never mind 
 :-) When you press EXAM (or DEP) the M7859 must do a UNIBUS access.
 Grant problems will turn on BUS ERR, so there lies you first 
 point of interest to check out.

 You say "I get that BUS ERR no matter what I do".
 Please tell exactly what "no matter ..." actions are.

 I have no experience with core based 11/34's, so I can not 
 tell anything more about your board placement. The manual will tell!
 However, (not sure), if you have some G7273's, replace the 
 G727's and put the G7273 in position C-D.

 BTW, I am not sure of "All grant cards are installed where 
 you could read FLIP CHIP from the processor side". I am not 
 near my 11/34. If "FLIP CHIP" is in the etch on the side 
 where the 4 BR contacts are, then they might be installed 
 wrong in the slot!
 AFAIR, it should be like this (seen from above towards the 
 backplane, I can check that this evening):

            slot X            slot 2  slot 1 <[most right]
             __               M8265   M8266
             | | position      | |     | |
             | |    D          | |     | |
             | |  ...........  | |     | |
             | |               | |     | |
      ---->  | |               | |     | |
             |_| G727          | |     | |
     this side                 | |     | |
     has the                   | |     | |
     contact                   | |     | |
     fingers

 - Henk, PA8PDP.

  -----Original Message-----
 From: cctalk-bounces at classiccmp.org
 [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Julian Wolfe
 Sent: donderdag 3 november 2005 10:44
 To: 'General Discussion: On-Topic and Off-Topic Posts'
 Subject: 11/34a issues

 Okay, so I FINALLY worked out my BA11-K power supply issues and got 
 everything sorted out and installed again.

 However, I'm back to where I started when I got this thing (which I 
 never got past) - I turn it on, the display comes up at 173536.  
 However, whenever I try to EXAM anything, it displays   000000 and the 
  BUS ERR light comes on.
 I can clear, but I get that BUS ERR no matter what I do.  I haven't 
 got a serial console connected to it yet - I got this info by going 
 through the
 11/34 diagnostics in the manual.

 Here's my setup:

 BA11-K box
 DD11-PK backplane

 UNIBUS layout:
 A     B     C     D     E     F

 M8266 M8266 M8266 M8266 M8266 M8266 1
 M8265 M8265 M8265 M8265 M8265 M8265 2
 M9301 M9301 M7800 M7800 M7800 M7800 3
 H222A H222A H222A H222A H222A H222A 4
 blank blank blank GRANT blank blank 5
 H222A H222A H222A H222A H222A H222A 6     
 blank blank blank GRANT blank blank 7
 M7850 M7850 M7859 M7859 M7859 M7859 8
 M9302 blank blank GRANT blank blank 9

 I've tried switching some boards around, no help.

 All grant cards are installed where you could read FLIP   CHIP from the 
 > processor side.
 > 
 > I have NO idea what's wrong.  Is the memory possibly bad?  
 > That's the only thing I could think of.
 > 
 > Any help, as always, would be much appreciated.
 > 
 > TIA
 > Julian 
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