Update:
This is the map of the machine:
........................ AAA BBB CCC DDD EEE FFF ....................
(Rear/Fans/Power Supply) 1 [M8266----------------] (Front/Keypad/DC ON)
........................ 2 [M8265----------------] ....................
........................ 3 [M9312] [M7859--------] ....................
........................ 4 [M7891----------------] ....................
........................ 5 [M7762----------------] ....................
........................ 6 [M7860--------] ....................
........................ 7 [M7840----------------] ....................
........................ 8 GNT ....................
........................ 9 [M9302] [M7856--------] ....................
........................ AAA BBB CCC DDD EEE FFF ....................
Reseating the ribbon cable on the M7859 changed the display. I have
replaced the M7840 with a G7273.
Now when I power on it says (dim)0, (bright)0, blank, (dim)0, blank, blank.
I have reseated the M7859, I don't think I have another one.
Maybe I should hit it with a vacuum.
I had forgotten about needing to cut a wire for DMA. Can you give me a
refresher on how to tell which slots are cut? I remember having to turn
the chassis over and looking for a particular wire but that was >15
years ago.
On 12/8/2017 3:17 PM, Henk Gooijen wrote:
>
>
>
>
>
> Van: John Welch via cctech
> Verzonden: vrijdag 8 december 2017 21:25
> Aan: cct...@classiccmp.org
> Onderwerp: Revive 11/34
>
>
>
> 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
>
>
>
>
>
> It is not completely clear (to me) how the modules are installed in the
>
> backplane. Standing in front of the 11/34 processor box (looking at the
>
> console), slot number 1 is at the right side. Each slot has 6 positions.
>
> Position A is at the rear side, followed by B thru F. Position F is
>
> thus at the front side.
>
> There is no confusion about the first 4 slots.
>
>
>
> Slot 1 and 2 hold the 11/34A processor boards, with M8266 in slot 1,
>
> and M8265 in slot 2.
>
> Slot 3, positions A and B has the M9312 bootstrap/terminator board,
>
> and slot3, positions C thru F has the M7859 KY11-LB programmer's console
>
> interface board.
>
> Slot 4 holds the RL11 interface. This module does "DMA", so the NPR
>
> jumper must be cut (open) on the backplane.
>
> Slot 5 has an SPC in positions C thru F. I had to look it up; it is the
>
> DR11-C.
>
>
>
> We are up to slot 6. Now things get "interesting" ... is that M7840 a
typo?
>
> The field guide says that this is a KE11-B Extended Arithmetic Element.
>
> I do not know that board, is it "hex" or "quad"?
>
> Not sure that board belongs there ... and if it is quad, I assume it has
>
> to be in positions C thru F. I would suggest to pull this module, and
>
> check the NPR wire presence on the backplane. You need a G727A or G7273
>
> in this slot when the M7840 is removed.
>
>
>
> If you are not skipping slots (see below), we are now at slot 7. There
>
> is probably a G727A grant continuity card (aka "knockle buster") in
>
> position D. That would be OK, but if the NPR jumper is cut on the
>
> backplane, you would need a G7273 continuity and NPR card in positions
>
> C - D. It is easy to have the G727 put in wrong. The 4 copper "jumper"
>
> traces should be facing the next higher-numbered slot.
>
>
>
> Then you say that the next slot has the M9202 (in position A - B) and
>
> the M7856 (SLU and RTC) in positions C thru F.
> The M9202 connects two system units (backplanes). So, what is the next
>
> backplane? Or do you have the M9202 in slot 8 and slot 9, positions
>
> A - B? I have never seen that ...
>
>
>
> I am missing one slot. The 11/34 backplane has 9 slots.
>
>
>
> When you power up the system, the display should show 6 octal numbers.
>
> If only one digit shows a number (7 or 5 or whatever), there is an
>
> issue with the console itself, or the M7859. The 6 digits of the display
>
> are multiplexed. Maybe the connection cable between the console and the
>
> M7859 - damaged/knicked? It is worth checking out the simpler things
first.
>
>
>
> Henk.
--
Sincerely,
John Welch
281-353-4706 Home
713-725-7017 Cell
:qw
