Sadly, I've never even seen an Amiga System :) Only OS's Ive used
(hands on) have been DOS, Windows, and Linux. Never even had my hands
on a Mac.
I know I'm taking your 'hands on' comment a bit too literally when I say this, and this is a bit of a controversial take that some people will take issue with, but by the time the Amiga and Atari ST came along the bits of the computer that you actually touch were pretty similar across all the machines. Emulation or FPGA reimplementation can give a very close approximation of what it was really like to use those machines.
Don't hesitate to fire up an emulator and learn about those machines, you can get 99% of the experience of using those old beasts without actually needing one, and you get the huge advantage of not neccessarily needing to worry about capacitors or batteries or ancient irreplaceable ULAs or custom chips shitting themselves, managing mountains of floppy disks, blurry CRTs torching your eyeballs in the deep of the night or perished plastic and rubber breaking because you breathed in its direction.
I made a MAME arcade machine out of an old empty JAMMA cabinet, and it's glorious, even though it's "only" emulation. That was a lightbulb moment for me, most of the joy is in the sensory parts of the experience. The feel of the joysticks and buttons, the stance you have to adopt, even the smell of particle board, and those are all things that a cabinet made of brand new parts could deliver.
From the 16-bit era on, keyboards and mice, which are the only bits of a computer that you regularly need to touch have been pretty standard from one computer to the next, all the uniqueness of the experience resides in the parts that you don't touch. Emulating an Amiga, Atari ST, Apple IIgs, 68k Mac or an old PC is much more convincing than emulating old 8-bit machines with their wildly varying keyboards and cases.
Don't think that just because you're only using emulation that you aren't getting a real dose of what it was like to use those old clunkers "back in the day". :)
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