The PDP-11/34A (KD11-EA) is an upgraded version of the PDP-11/34 (KD11-E) processor.
The basic components of the PDP-11/34A processor are a system unit, which is a dedicated 9 slot backplane (DD11-PK), and the following two boards:

M8265 - data paths M8266 - control paths The basic processor can be expanded with the following options: M7859 - KY11-LB programmer's console interface board M8267 - FP11-A floating point processor option board M8268 - KK11-A cache memory option board Jumps within this page are: location of the processor boards available documentation diagnostics

The KD11-E backplane is a dedicated backplane wire-wrapped to connect the 11/34(A) CPU boards. This means that each board has a specific slot allocated and the board must be installed at the correct position. BASIC PROCESSOR MODULES   module id     slot     position     form factor   M8266 1 A tru F hex M8265 2 A tru F hex   The data paths (M8265) and control paths (M8266) modules are connected via the processor backplane (DD11-PK). PROCESSOR OPTION MODULES   module id     slot     position     form factor   M8267 3* A tru F hex M9312 4* A tru B dual M7859 4* C tru F quad M8268 5* A tru F hex   The location of the M7859, M9312,M8267, and the M8268 depend on which of these are actually installed. The slot numbers in the table are correct if these boards are all installed. This is the maximum 11/34A processor configuration. For more detailed information see in the options folder the documents "FIS", "cache", and "bootstrap".

Slot 9, positions A and B carry the signals of the UNIBUS. At this location is either a UNIBUS termination module (which is an M9302 for the PDP-11/34A), or a module for interconnection to the next system unit. The interconnection is done with a module bridge, M9202.
Slot 9, positions C thru F, is a so-called SPC slot. SPC stands for Small Peripheral Controller. The common use of this SPC slot is the interface module to connect the system console. I have an M7856 installed in this slot, which provides one single RS-232A asynchronous connection for the system console. With a switch box the asynchronous comm line is connected to the VT102 console at 9600 Bd. I use a switchbox because the VT102 can thus also be connected to the PDP-11/44.

The console is installed on the BA11 box with two simple brackets. In the picture you see the righthand side. The bracket is installed on the BA11 box with two screws. Just one screw in the middle of the bracket holds the console panel in its place.

The grey round cable in the top of the picture connectes to the M9312 Bootstrap/Terminator module with FAST-ON TABs and is wired to the rotary knob on the front panel via the circuit board attached to the rear ised of the front panel.

The ribbon cable connects to the M7859 KY11-LB Programmer's Console Interface with an IDC connector. The cable carries multiplexed signals to scan and read the keypad and control the six 7-segment displays, and the three LEDs.

I  think  the twisted red/green/black cable are the power supply wires to the console, but I can not remember that detail. I am too lazy to remove the console panel and have a peek ...

Engineering drawings

• 1134A Field Maintenance Print Set MP00190
• KD11-EA Field Maintenance Print Set MP00192
• 1134A Power Supply Unit Field Maintenance Print Set MP00270
• H7441 Field Maintenance Print Set MP00271
• H777-0 Vol.1 Field Maintenance Print Set MP00016
• H777-0 Vol.2 Field Maintenance Print Set MP00309

Manuals

• PDP-11/34 system user's manual   (EK-11034-UG-001)
• KD11-E central processor maintenance manual   (EK-KD11E-TM-001)
• PDP1134A power system description   (EK-1134A-TM-002)
• KY11-LB programmer's console/interface module operation and maintenance manual   (EK-KY1LB-MM-001)

For the basic 11/34 processor the following diagnostics are available.

«-»	FKAA(x)	11/34 CPU test
«-»	FKAB(x)	11/34 TRAP test
«-»	FKAC(x)	11/34 EIS test
«-»	FKTG(x)	11/34 instruction I/O exerciser
«-»	FKTH(x)	11/34 memory management

 
For the 11/34A processor options the following diagnostics are available.

«-»	FFPA(x)	11/34 FP11-A part 1
«-»	FFPB(x)	11/34 FP11-A part 2
«-»	FFPC(x)	11/34 FP11-A part 3
«-»	FKKA(x)	11/34 Cache test

 
The (x) represents the revision level.