The Videogame History Museum collects and occasionally presents vintage gaming gear, from classic home game consoles to full-size arcade machines, to advertising and merchandising material.
The museum doesn't have a permanent home, and currently travels to US games shows such as PAX and GDC. The collection on display at E3 2014 in Los Angeles was impressively broad, and a fun break from the hyper-modern games being pushed at the rest of the show.
Coleco made a series of tabletop arcade games in the early 80s. While the simple LED light gameplay wasn't really all that close to the original arcade versions, these were still highly sought after by Generation-X kids (like myself).
This is the original 1977 Atari 2600, the machine that essentially launched the home console business. Note that before it was known as the 2600 (its part number), it had the ambitious moniker "video computer system."
This keyboard add-on promised to turn the Intellivision into a state-of-the-art early 80s PC, and give it a leg up over other home consoles. Long delays meant only a few thousand were ever released to the public.
This 1979 oddity, called the Mattel Horoscope Computer, purported to reveal the level of compatibility between two people. The included documentation bizarrely claimed its predictions were only accurate up until the year 1987.