What I remember most clearly from early grade school days: old Apple computers with green text on a black screen (Apple IIs?). We didn't get much time with them, but did have one class where we were given a sheet with a list of commands (to make the cursor draw a line left, up, right, down). If we entered the entire tedious list correctly, we could draw something as exciting as--a circle! Whoa. And yet, it really was amazing to see a bunch of tiny steps accumulate to become tangible. A good lesson for a kid.
Later, our first home computer was a secondhand IBM PC/XT with two 5 1/4" floppy drives and no hard drive. It had GAMES. Granted, most of the games were very limited shareware text based adventures written in BASIC, but even so. Best of all, because everything was so simple and limited back then, even we as dopey kids figured out how to get into the code and change it. "You are now entering baby at the time's room. A fat, drooling creature stares at you balefully from a four-legged cage in the right corner. Naked miniature plastic corpses litter the floor. What do you want to do?"
We also had Hack, which is now Nethack, which is still perhaps the best dungeon adventure game of all time, and which I still haven't ever beaten. I always seem to end up starving or turned to dust just before the good part. Argh. But this does mean I still play it now and then, and thus my gaming hardware requirements are, shall we say, modest.
We had assorted other secondhand computers over the years, though none that really stick in my head like that first one. I remember games like International Bridge Contractors, and a Winter Olympics game (WinterG) we played for days straight. I also remember composing music of a sort--somewhere one of my brothers still has "Munchkin Dance," which was our crowning achievement. If I ever track it down...I'll link to it. Electronic random weirdness. We were ahead of our time.
The first computer I ever purchased with my own money was a Pentium 90 with 8MB(!) of RAM and a 1GB(!) hard drive, running Windows 95. Just to contrast, my current phone has 2 GIGABYTES of RAM and 32GB of storage space, plus an extra 16GB on a card the size of a fingernail.
But that computer was my first connection to the Internet (via dial-up, of course). It was so new to me, I remember typing random words and brands .com just to see what (if anything) came up. And later, I was able to talk to Mom all the way back in Vermont using ICQ (remember that?). At the time, I was stationed in Germany, and being instantly able to see what she was typing halfway across the world was pretty incredible.
I experienced my first laptop during a project in Germany: it was at least two inches thick, had a tiny screen that lagged behind anything actually typed, and must have weighed ten pounds. And I fell in love. The whole idea of a self-contained computer you could carry around (sort of) just enchanted me. I've *mostly* had laptops ever since, despite the drawbacks. They've come a long way, baby. It's a little ridiculous how I'm now fretting over whether a system weighs under three pounds or closer to four, and if I can afford a Super Duper Ridiculously High Resolution screen or just one a mere gazillion times better than anything I could have imagined all those years ago.
I'm pretty sure any of them can handle Nethack.