Some info (text, no diagram) can be found in this document, page 1-5:
EK-MIC11-TM-002_MicroPDP11_Systems_Technical_Manual_Sep85.pdf. The schematic referred above was derived (IIRC) from a PDP-11/03 schematic which I redrew in KiCAD with added the PX0-600 part. I use an ATX-power supply, so the...