From <a href="http://telehack.com/telehack.html" rel="nofollow">http://telehack.com/telehack.html</a><p>"Telehack is a simulation of a sylized arpanet/usenet, circa 1985-1990. It is a full multi-user simulation, including 25,000 hosts and BBS's the early net, thousands of files from the ero, a collection of adventure and IF games, a working BASIC interpreter with a library of programs to run, simulated historical users, and more."