He didn't bring UNIX onto personal computers. That was also AT&T, unsurprisingly (desktop and laptop UNIX): http://en.wikipedia.org/wiki/AT%26T_...stems#Desktops wayyy back in 1983. If you're going to take NeXT (which was aimed at developers, not end-users), then you might as well count AT&T's desktops/laptops. BSD isn't "not known" here... it's simply irrelevant to the conversation.