DEC Rainbow 100
This barely counts as an appearance, and only the monitor and keyboard are displayed, but a genuine commercial for the Rainbow is on TV in the hotel room.

A wartime experiment designed to make a warship invisible to radar goes wrong sending two from the crew from 1943 to 1984. This film is based on a "true story", or a common conspiracy theory in any case.
•DEC Rainbow 100 •Commodore VIC-20 •Osborne Executive
This barely counts as an appearance, and only the monitor and keyboard are displayed, but a genuine commercial for the Rainbow is on TV in the hotel room.
The VIC-20 appears in the military base's control room.
Would a home computer designed for games really be used in a military research base?
The Osborne appears in the military base's control room.