As pointed by logix in #NetBSD/IRCNet, the Sony PSP license shows that
some NetBSD code was used in, most probably, the console's TCP/IP stack.

Indeed, very amusing:
http://www.scei.co.jp/psp-license/pspnet.txt

Regards.

-- 
 Rui Paulo <rpaulo@netbsd-pt.org>        http://www.netbsd-pt.org/users/rpaulo/