Reply 20 of 26, by TrashPanda
I'm thinking of building a few of these ATX2AT Smart Convertors from here https://x86.fr/atx2at-smart-converter/ I like the idea of the simple adapter cables for known good hardware but feel having something a bit more robust for the weird shit that can happen when powering old hardware may be more beneficial.
The project is open source so could be adapted to suit any PSU and not just AT.
Having looked at the Github there may need to be a bit of tinkering and substitution to get the right parts for it but a good puzzle never scared me.