wiki.osdev.org
Godspeed.
AmigaOS
Why contain it? Let the buffers overflow into the schools and churches, let the memory leaks pile up in the streets. In the end, they'll beg us to save them.
Would you get an all-in-one now? I wouldn't. It's the worst of both worlds: not expandable like a tower, and not portable like a laptop. So it makes little sense for a regular home user. Although it makes sense for some business stuff, like a sales terminal or marketing kiosk, where you need something that will stay in one place but take little room.
AROS runs on x86.
Not for personal use, but I would consider them for the ease of replacing everything in one go, if I had to maintain a whole lot of desktops.
I think an all-in-1 today is just called a tablet. After all, they don't sell many CRTs anymore. So you just shove an ARM SBC into a thin case behind the display, and maybe throw in a detachable keyboard, and Bob's your uncle.
What's the easiest way to get into trying out AROS without resorting to the likes of Qemu?
... or running on my bare hardware.
Buy a workstation for 40$
VirtualBox is simple enough. Also, download V2.2.1 from the site instead of V2.2.3 and then update it.