SDF Public Access Unix System
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It has been in continual operation since 1987 as a non-profit social club. The name derives from the Japanese anime series The Super Dimension Fortress Macross (the original server was originally a BBS for anime fans.)
The system currently includes NetBSD servers for regular use (running on DEC Alpha-powered hardware) as well as a TWENEX system. Besides offering free Unix shell access to its users, SDF provides dialup access and web and Gopher hosting. It's one of very few servers still running the latter protocol.
The system contains hundreds of programs and utilities, including a BBS, chat program, email programs, webmail, and developer tools. SDF allows schools the use of SDF's computing resources for Unix classes.
In 1987, Ted Uhlemann started SDF on an Apple IIe microcomputer running "Magic City Micro-BBS" under ProDOS. The system was run as a "Japanese Anime SIG" known as the SDF-1. In 1989, Uhlemann and Stephen Jones operated SDF very briefly as a DragCit Citadel BBS before attempting to use an Intel x86 UNIX clone called Coherent.
Unhappy with the restrictive menu driven structure of existing BBS systems, Uhlemann, Jones and Daniel Finster created a UNIX System V BBS in 1990, initially running on an i386 system, which later became an AT&T 3B2/400 and 500, and joined the lonestar.org UUCP network. Three additional phone lines were installed in late 1991.
In the fall of 1992, Uhlemann and Finster left SDF to start one of the first commercial Internet companies in Texas, Texas Metronet.
In 1997, SDF (then with about 15,000 users) migrated to Linux. The migration to Linux marked a turning point, as the system started coming under attack like it never had before in its history. Jones calls the Linux period the dark age. In part due to the number of attacks undertaken by malicious users against SDF, the years 2000 and 2001 saw SDF migrate from Linux to NetBSD and from Intel x86 to DEC Alpha. This migration included relocation of the servers from Lewisville, TX to Seattle, WA. The Linux system was officially decommissioned on August 17, 2001. The occasion was captured in a COMMODE log preserved by one of SDF's users. (COMMODE is a DEC TOPS-20 chat system ported by Jones to Unix.)
Although SDF Public Access UNIX System was registered as an operating business in 1993 according to the Dallas County Records Office, it wasn't until October 1, 2001, that the SDF Public Access UNIX System was formed as a Delaware not-for-profit corporation and subsequently granted 501(c)(7) non-profit membership club status by the IRS. SDF had operated under the auspice of the MALR corporation between 1995 and 2001.
Current status 
SDF is now composed of more than 30,000 users from around the world. SDF users include engineers, computer programmers, students, artists and professionals.
See also