A worldwide hobbyist network of personal computers which exchanges e-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 IIs, 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.