Revive 11/34

[Henk Gooijen]

Ahh, that M9203 in slot 9, positions A – B, sounds more familiar (or is it M9302?)

The M7856 is often in slot 9 position C – F, when used as console.

Interesting, the 11/04 also has that M7840 installed. Could you pull that board (uhmmm, you did), and have a look at the texts in the etch? The “older” boards (UNIBUS, and many QBUS too) had a function identificaltion in the etch. Like the M7856, which says (IIRC) “SLU & RTC”. Maybe the identification in the Field Guide is wrong …



Before powering up the 11/04, I would do a thorough mechanical check of it, as many times described here … for example: loose screws in the box (took out my 11/35 arghh, working on a repair!), cables not properly seated, dust and other things that should not be there. Just an overal inspection. You could makes notes of where the boards are placed and take a picture. Then remove the boards (observe ESD guide lines), turn on the power and check the voltages from the regulators. Easiest way to do that is removing the bottom cover.  Then you can check the voltages on the connection points at the rear end of the backplane(s). If needed, adjust the output voltage(s).

Turn off, and wait (measure!) that all voltages have dropped to near zero. Install the boards again, connect a terminal and proceed …



Back to the 11/34A.

I haven’t turned on my 11/34 for some time, so I forgot whether the 7-segment display has 6 or 7 digits.

But what I do know is that they are always all 6 (or 7) on. If that is not the case, there is definitely something wrong.



________________________________
Van: cctech <cctech-bounces at classiccmp.org> namens John Welch via cctech <cctech at classiccmp.org>
Verzonden: Saturday, December 9, 2017 12:49:01 AM
Aan: Jerry Weiss; cctech at classiccmp.org
Onderwerp: Re: Revive 11/34

I also have an 11/04 that I went and drug out.  It is configured like this:

11/04:
........................   AAA BBB CCC DDD EEE FFF ....................
(Rear/Fans/Power Supply) 1 [M7263----------------] (Front/Keypad/DC ON)
........................ 2 [M7847----------------] ....................
........................ 3         [M7859--------] ....................
........................ 4 [M7847----------------] ....................
........................ 5             GNT ....................
........................ 6 [M7762----------------] ....................
........................ 7 [M7840----------------] ....................
........................ 8         [DILOG--------] ....................
........................ 9       {nothing} ....................
........................   AAA BBB CCC DDD EEE FFF ....................
I am thinking I could put a M9203/M7856 into slot 9, and find a M9312
for slot 3 and maybe this would fire up.  Any suggestions?


On 12/8/2017 3:50 PM, Jerry Weiss wrote:
> On Dec 8, 2017, at 2:25 PM, John Welch via cctech <cctech at classiccmp.org> wrote:
>> I am reviving an 11/34. Cards are:
>>
>> Back/Fans [M8266--------]  Front of machine where keypad is.
>>
>>            [M8265--------]
>>
>>            [M9312] [M7859]
>>
>>            [M7762--------]
>>
>>            [OPEN]  [M7860]
>>
>>            [M7840--------]
>>
>>            Bus grant in third from front slot
>>
>>            [M9302] [M7856]
>> The 7856 is hooked to a cable/null modem (i think)/PC running XP&Hyperterminal
>>
>> When I first powered on the programmers console said '7' and I powered off, then back on, and now it says '5'
>>
>> Any suggestions as to what to try first?  I may have the bus grant in backwards.  I have other boards I can try.
>>
>> Sincerely,
>> John Welch
>> :qw
>
> 1) The G727A bus grant card is keyed (somewhat).     It should be in Row D (fourth from the back)
>       It won’t seat evenly if reversed. At least that is what my scraped knuckles remember.
>
>       You can temporarily pull it out to finish the check out.  There’s nothing past the
>        M7840 that requires DMA.
>
> 2) Check the baud rate, stop bits and parity settings on both the Hyperterminal and the M785 to make sure they match.
>
> 3)  Are you seeing a single 7 or 5 on  KY11-LB Programmer Console or on the Hyperterminal?
>
>       An other status led’s lit on the KY11-LB?
>
> 4) I don’t see any memory listed…  Do you have any M7847’s?
>
> 5) Grab a copy of EK-11034-UG-001 PDP-11-34 System User’s Manual for more info.
>
>
> Jerry
>

--
Sincerely,
John Welch
281-353-4706 Home
713-725-7017 Cell
:qw