Used Xylogics 300-101-600 Unibus Disk Controller PCB from a DEC PDP11 system. This was used to control Ampex disk drives and other peripherals. It was removed from a working computer. 

We have nearly 100 DEC circuit boards from the PDP11 period computers. They were removed from PDP11-24 and PDP11-73 systems. Call or watch our Ebay store for more listings.