the microsparcs are not the same as the others. there's a port i did of plan 9 (second edition) to the sparc lx/classic using fujitsu microsparc documentation (and existing sparc port code). it's on sources in contrib/forsyth/lx.tgz
you'd need to change it somewhat for the different mmu and screen interfaces, but otherwise i don't think it would be much work. i can't do it because i got rid of the microsparcs about ten years ago.
