The PDP16 had a constants card circa 1972 or so. The constants card was basically cores with hand threaded wire done by the customer, and acted like a ROM. I don't remember the capacity, but IIRC it was about 16 bytes. > Did the PDP14 (or any machine of that era) ever use hand-threaded (by the > end user) core boards as ROM? > > tnx. > > g.