I was at a seminar yesterday where the Computrainer was discussed.
This is a trainer (a stand that you put a bike on that allows you to use it like a stationary bicycle) that comes with software to allow you to ride specific courses (using the trainer to simulate elevation, and other riders) as well as measuring your speed, power output, efficiency, etc.
One thing that caught my attention was that earlier versions (in the late 80's, early 90's) used an NES to provide the display. Apparently that's what the speaker had purchased when picking up a used one.
At first, I thought this was the bike game that always seemed to top rarity lists. However, looking at the guide, that's actually an SNES product (exertainment mountain bike rally).
I don't see any mention of the computrainer cart on the rarity lists for NES (however, I don't collect for NES, so wouldn't know if its listed under another name). Just a curiosity I felt might be worth mentioning.
Here's an article discussing the origins of the computrainer including the NES reference. Pictures are not labelled, so hard to tell if one is actually the NES (versus PC) display.
http://www.trinewbies.com/Article.asp?ArticleID=122