[jjav]

Not really. Sure you can find something on ebay but some parts can be hard to find (I collect old SPARC machines).

More importantly, you can't go back to the time where you could interact with the world with the older machines. My SPARCstation10 would run a web browser marvelously in 1993, but that combination isn't going to browse any website today.

[aprdm]

Right that's fair. But you can browse websites made with the technology of that time -- maybe ?

Or work with it disconnected on other bits... but yeah. The world you're connecting to has changed..