[NTG-context] bold with type?

Hi all, I need to have bold characters with type. I tried what is said here: http://wiki.contextgarden.net/Bold_typewriter but cmttb is not on my machine (TexLive 2008 ), and context or texexec are complaining; only the umtypewriter family seems to have bold faces, but it's a bit too ugly for me :-( Any idea? tia, -- Jean