I ran Windows 3.0 on a 16MHz 386sx with 5MB of RAM and a 40MB disk. That's with a graphical word processor, PostScript Fonts, and a set of speedy graphical development tools. (Turbo Pascal for Windows)
In today's world, you'd be hard pressed to find many embedded devices with such minimal specs [1], but in 1991 it was a useful and complete desktop computing environment. [2]
1] Less than ten years later (1998-1999), I was doing embedded development work. The device I was working on would fit in the palm of your hand and ran an AMD Elan SC400 - a 486/33 class device that would've been better than a top of the line desktop PC in 1991-2.
2] In the interest of full disclosure, my next machine was a 486/33, which was followed by a P5-100 a few years later. Both of those machines provided game changing levels of new power. There were important workloads that were enabled by each of the two upgrades. My current machines are a lot better than either of those two, but I don't think any subsequent upgrade was as close to as significant as those two were in terms of local application functionality. (But I don't game.)