Paralel said:

After doing some searching on this topic it appears that back around the turn of the millennium there were certain extensions, when edited using ResEdit, that could provide USB on System 7. However, I was unable to locate any detailed information, such as which extensions, what edits were needed, etc...

I feel the answers lie in the archives of various Mac specific newsgroups with posts from that peri-millenial period.

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It's too bad that the xlr8yourmac discussion forums are gone. Is there an archive anywhere? I bet that if that was discussed anywhere it was probably discussed there. That was the hot spot for that kind of stuff back then.

You might also try a search through the Macgurus forums and possibly the LEM List archives for the appropriate machines -- PCI PowerMacs, back before they moved to Google Groups.

Wasn't there some kind of resedit group or email list or newsletter way back when? Something about that is tickling my memory.