Oh, very neat. I've read most of the papers in the proceedings of this conference, the 1986 ACM Conference on the History of Personal Workstations [1], which is full of great information. But while 10 of the 13 speakers wrote up their talks as papers for the proceedings, three didn't, and this was one of the missing ones (the other two were the talks from Alan Kay and Charles H. House). So it's great to now have the talk available.
[1] Open access, click on the "table of contents" tab: http://dl.acm.org/citation.cfm?id=12178&picked=prox