11/34a issues

Wed Nov 9 01:52:54 CST 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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