On Dec 26, 19:55, John B wrote: More than likely. One of my friends has one complete DX-11 (Unibus-to IBM-channel interface, built from Flip Chips, in a fair-sized rack) and one incomplete, in pieces, for spares. They were in use between 11/34's and an Amdahl until about 4 or 5 years ago. One has LEDs, the other incandescent lamps. -- Pete Peter Turnbull Dept. of Computer Science University of York