The keyboard for the Olivetti M240. The connector is a DE-9, but with a simple passive adapter it plugs right into PS/2 with no issues. It's a membrane, but the strokes are noisy anyways. They don't require mush force to activate, but I guess that after 33 years the rubber domes aren't as stiff. It's built like a tank, with two stainless steel plates keeping the layers together, so it weighs 4 kg (almost 9 lbs). There's no way it's moving around my desk. The detachable cable renders it an easy conversion to weapon, if needed.