- Welcome to The 20th Anniversary Macintosh Web Site - the Official home of the TAM user community. This is the place where 20th Anniversary Macintosh owners can share a wealth of information on this insanely great product. The TAM (Twentieth Anniversary Macintosh) is a unique machine in the world of computers and this site will help you get the most out of yours. NEWS | LINKS | TECH | TAM ...tam.axon.net