[cctalk] Cards in the PDP-11/05 just sold on eBay

G'day all, Just followed the sale of the 11/05 on eBay (#175655196586) that ended a short time ago. It's a remarkably clean and complete machine and am not surprised at the hammer price. I was curious what the quad-height card with two ribbon cables coming out the sides was? It appears to have a couple leads as well, presumably going to the single-height board. Some sort of TTY interface? I presume non-DEC from the nylon handles. Steve