Two different very early Lisp Machines (a Xerox Dolphin and a MIT CADR), which are personal workstations running a Lisp operating system with early graphical us

Two different very early Lisp Machines (a Xerox Dolphin and a MIT CADR), which are personal workstations running a Lisp operating system with early graphical user interfaces, are being demonstrated, from Xerox PARC. Both machines are integrated into the early 3 Mhz Ethernet there. The Interlisp-D / Xerox Dolphin demo begins at 00:20 and the Lisp Machine Lisp / MIT CADR demo begins at 25:00. Includes noises from Lisp Machine keyboards. The use of the Interlisp-D structure editor for source code is shown. The demo was for the IJCAI (International Joint Conference on Artificial Intelligence) in Vancouver, 1981 I've watched the H.264 version.