clabretro does it all on hardmode too. Picks the most obscure, esoteric shit to try and get working: IBM i was the most recent, but his AT&T Merlin Phone series was great. I feel like the Sun Ray stuff was the most likely to be you know, actually documented in a way meant for mere mortals to read, and still likely to be hosted somewhere accessible.

The IBM i stuff, my god, the acronyms, the terse and unhelpful menus and error messages, the insane lengths to get a simple goddamn serial console, it's no wonder IBM gets paid to handle it all for you.