A long, long time ago, I obtained a Midi Workstation, called an Ensoniq KS-32. I'm still thankful for the great deal I got on it. I'm also greatful that the guy I bought it from didn't break my leg, since I didn't finish paying that really good price for 3 years. Despite some harrowing times (orange juice dumped into it), it still functions to this day. One note about the KS-32, is that the settings are stored on-board in RAM, or Random Access Memory....
I have an Ensoniq KS-32 keyboard that was released 20 years ago. I think that mine is only 17 years old, though (I'm the third owner, but I have owned it since 1998). Anyway, it's a great board, and it has treated me very well for a very long time. There had been a low battery warning for, probably the last 10 years or so. My response was to just never turn it off, which worked until I had to turn it off for a while....
Xerox Alto Mouse (1973) The computer mouse has been a basic part of computing for about 20 years now (25 if you were a Mac early-adopter, and even longer if you are a Xerox Alto power-user). Up until recently, innovations with mouses have been about adding more buttons, and scroll wheels. Now, with Smart-Phones becoming more and more popular, things like multi-touch and gestures are being added too....