Through a lucky happenstance, I have a huge amount of TRS-80 stuff, though honestly too much for me to handle (lots of binders, books, redundant hardware, etc.). In my schools, the oldest TRS-80 we had was the Model III (the all-in-one unit), and that's the unit I fell in love with and that's the unit that I wished to acquire first. Long story short, among my many TRS-80 systems are a fairly well loaded TRS-80 Model IV and several 4P's, which makes the prior systems obsolete in more ways than one. In fact, the biggest way it makes the prior systems obsolete and specifically the Model 1 in question, is that you need to do a one-time, one way conversion on the software to make it work on the IV, typically making it incompatible with the Model 1. So I have a few Model 1 systems that still work (though I've yet to get the disk drives to work reliably), but there's little reason to go to the effort of setting them up for a variety of reasons, including higher difficulty (and more) connections, and not all of the software I have working with them anymore.

Like I said, I have an unusual affection for the systems because that's how I learned real BASIC programming, though of course I had a Vic-20 and later C-64 at home (I just learned better in the structured environment). They're not great games machines, though they were very well supported for quite some time. I guess, like we've always said, classic systems have certain "personalities" and I always like the TRS-80 "personalities".