Quick research showed that some were marked as 'unmaintained', but I don't see anything that would prevent systems from booting, or even the code from working.

Quick research showed that some were marked as 'unmaintained', but I don't see anything that would prevent systems from booting, or even the code from working. Some (not all) of the systems were picked up by other people. I do not know where you're getting the information from, but if you want to, please share.