> Product: Samsung phone. Requirement: Samsung needs to keep that device usable for N years. What does "usable" mean though? If I were to go and dig my old Ap

> Product: Samsung phone. Requirement: Samsung needs to keep that device usable for N years. What does "usable" mean though? If I were to go and dig my old Apple Centris 650 [1] that I bought around 1994 out of my pile of old electronics, if the hardware still actually works it would still be able to do everything it did back when it was my only computer. It is running A/UX [2], which is essentially Unix System V 2.2 with features from System V 3 and 3 and BSD 4.2 and 4.3 added. Even much of what I currently do on Linux servers at work and on the command line at home with MacOS would work or be easy to port. So in one sense it is usable, because it still does everything that it could do when I got it. But it would not be very good for networking because even though it has ethernet and TCP/IP, it wouldn't have the right protocols to talk to most thing on today's internet and the browsers it has don't implement things that most websites now depend on. So in another sense we could say it is not usable, although I think it would be more accurate to say it is no longer useful rather than unusable. [1] https://en.wikipedia.org/wiki/Macintosh_Quadra_650 https://en.wikipedia.org/wiki/Macintosh_Quadra_650 [2] https://en.wikipedia.org/wiki/A/UX https://en.wikipedia.org/wiki/A/UX