henk.gooijen at hotmail.com
Fri Dec 8 15:17:22 CST 2017
Van: John Welch via cctech<mailto:cctech at classiccmp.org>
Verzonden: vrijdag 8 december 2017 21:25
Aan: cctech at classiccmp.org<mailto:cctech at classiccmp.org>
Onderwerp: Revive 11/34
I am reviving an 11/34. Cards are:
Back/Fans [M8266--------] Front of machine where keypad is.
Bus grant in third from front slot
The 7856 is hooked to a cable/null modem (i think)/PC running
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.
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
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
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.
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