Dan Bricklin, who was the creator of VisiCalc, was present at COMDEX Fall 1983, which was held from November 28 to December 2, 1983. He had a video recorder and recorded some of the event. Included was a demonstration held by IBM to show off its new IBM PCjr. The relevant footage starts about 20:00 into this video, which he posted in 2012 :
https://www.youtube.com/watch?v=1VNS8TE4XhU
It continues for the first six minutes of part 2 :
https://www.youtube.com/watch?v=hrgwliaIYTQ
The whole event is obviously interesting, and its amazing that just two years after it was announced, the strong presence of the IBM PC.