My oldest unit was
   an[1]https://en.wikipedia.org/wiki/Magnavox_Odyssey_series...
   that I got from a garage sale for $5. I had an Intellivision and
   a Color Computer 2 at the time (1984) and I was FASCINATED by
   retrogaming consoles, like the Odyssey 200, which was made in
   1976 when I was 4 years old. It had corroded batteries in it,
   which I scraped off (burning my hands a little because the acid
   or base was still strong) and 12 year old Ken Udut got to play
   with a console that was already ancient video game history by
   then. By the time I was 17 (1989), I thought video games were a
   dying medium and I switched to "serious programming" and BBS's
   and the Internet instead of designing/marketing video games
   which is what Iwanted to do. I was wrong but no regrets.

References

   Visible links
   1. https://en.wikipedia.org/wiki/Magnavox_Odyssey_series.