11/34a issues

[Gooijen, Henk]

  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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