I think that if I contributed to this discussion of old-ass computers, it might be a get off my lawn moment, but here goes.
The first actual PC we had in the house was an IBM clone with a 10MB hard drive that ran XENIX, Microsoft Unix, which eventually became my computer after my father eventually upgraded to a 386 with actual AT&T System V on it. I never touched that thing, but it was a very powerful computer for its time. Having a hard drive in my first PC made me really snobbish about dealing with the Apple IIs that were pretty much the only computers I ever saw in a school setting, all the way through high school, which is part of the reason I never bothered to take any computer classes.
My original PC got upgraded to a 286 with Hercules (high resolution mono) graphics until I was gifted a Compaq 386 DX/25 notebook that had a 10" mono-VGA screen (I didn't have a PC that had COLOR graphics until like 1993), 4MB RAM and a very exotic 9.6kbps modem. NO ONE had a laptop back then, but my dad somehow wound up with two of them and never said anything about it. It was probably misappropriated from a grant somewhere, which is how a lot of weird stuff came to be in our house. I mostly used it to dial in to the University of Illinois. I was able to e-mail my brother there and access USENET, which was pretty amazing, really.
In high school, I started doing computer repair work. People would give me $50 or $100 to remove a BIOS password or install a modem so it would work at the same time as a mouse, or I'd have to sit and show somebody how to use Windows 3.1. When people asked, I'd say I was saving up to get a car, but I didn't even get a driver's license until I was 20. Instead, I bought a sick PC, a dual 486 DX/50 workstation system with 16MB RAM, SCSI hard drive and CD-ROM and a Tseng Labs 4000 4MB graphics card (the one part I bought myself; that computer had an extremely exotic Fujitsu workstation graphics card in it that just wasn't part of the deal when I bought it). Pentiums were available by that point, but they were stupidly expensive, as were the 72 pin DIMMs they needed. That computer had been meant to demo OS/2 and Windows NT software for a bunch of engineers who were mostly using HP/UX systems of the time. I ran OS/2 on it and eventually switched it to pre-1.0 Linux just to make doing my CS homework easier. I wish I still had that PC. It got passed on to my older brother when I upgraded in about 1997. I think I went with a dual P5/133 and then a dual PPro/200, the first couple PCs that I fully built for myself.