FidoNet n. A worldwide hobbyist network of personal
computers which exchanges mail, discussion groups, and files.
Founded in 1984 and originally consisting only of IBM PCs and
compatibles, FidoNet now includes such diverse machines as Apple
][s, Ataris, Amigas, and UNIX systems. Though it is much younger
than {Usenet}, FidoNet is already (in early 1991) a significant
fraction of Usenet's size at some 8000 systems.