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[[File:SDF Heart.jpg|thumb|The heart of SDF with a few spares. This also includes the diaspora pod, the Plan9 cluster and the bifrost cluster. (tour 2012)]]
'''Super Dimension Fortress''' (abbreviated as ''SDF'', also known as freeshell.org) is a [[non-profit]] public access [[UNIX]] [[shell provider]] on the [[Internet]]. It has been in continual operation since 1987 as a non-profit [[social club]]. The name is derived from the Japanese [[anime]] series ''[[
==Services==
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The SDF network of systems that serves its membership currently includes [[NetBSD]] servers for regular use (running on [[DEC Alpha]]- and [[Opteron|AMD Opteron]]-powered hardware) as well as [[retrocomputing]] environments: a [[TOPS-20|TWENEX]] system running the Panda Distribution TOPS-20 MONITOR 7.1 on two [[XKL]] TOAD-2 computers,<ref>{{cite web|title=Twenex Public Access System|url=http://www.twenex.org/?network|website=Twenex|access-date=8 January 2017}}</ref><ref>{{cite web|title=Twenex History|url=http://twenex.org/?history|website=Twenex|access-date=11 October 2021}}</ref> a [[Symbolics]] [[Genera (operating system)|Genera]] system, and an [[Incompatible Timesharing System|ITS]] system<ref>{{cite web |url=http://hactrn.org/ |title=Home |website=hactrn.org}}</ref>
SDF also hosts its own instances of [[social media]] websites from the [[fediverse]], including a [[Mastodon_(software)|Mastodon]] microblogging service,<ref>{{cite web|title=Mastodon at SDF|url=https://mastodon.sdf.org|website=mastodon.sdf.org|access-date=10 June 2023}}</ref> a [[Pixelfed]] image sharing service,<ref>{{cite web|title=Pixelfed at SDF|url=https://pixelfed.sdf.org|website=pixelfed.sdf.org|access-date=10 June 2023}}</ref> and a [[Lemmy (software)|Lemmy]] link aggregator with discussion.<ref>{{cite web|title=Lemmy at SDF|url=https://lemmy.sdf.org|website=lemmy.sdf.org|access-date=10 June 2023}}</ref> In addition, SDF hosts a [[Matrix (protocol)|Matrix]] chat server.<ref>{{cite web|title=matrix.sdf.org/|url=https://matrix.sdf.org|website=matrix.sdf.org|access-date=26 June 2023}}</ref>
=== Free Membership Services ===
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SDF also supports multiple retrocomputing experiences, including free user accounts on [[TOPS-20]] and [[Genera (operating system)|Symbolics Genera]] operating systems that are running live and accessible via the internet.
=== Dues-
There are additional services that are made available on SDF systems to users who apply to be "patrons" and pay one-time dues of US$36 for "Lifetime Membership", and still more services available for at US$9/quarter "sustaining membership", including services such as [[Nextcloud|NextCloud]], and access to a large disc-array server. At the sustaining membership level, members are authorized to validate new users to SDF's free User level of membership (otherwise, new members may submit US$1 to be validated).
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==History==
In 1987, Ted Uhlemann started SDF on an [[Apple IIe]] [[microcomputer]] running "Magic City Micro-BBS" under [[Apple ProDOS|ProDOS]]. The system was run as a "Japanese Anime [[Special
Unhappy with the restrictive menu driven structure of existing BBS systems, Uhlemann, Jones and Daniel Finster created a [[UNIX]] [[UNIX System V|System V]] BBS in 1990, initially running on an [[IA-32|i386]] system, which later became an [[3B series computers#3B2|AT&T 3B2]]/400 and 500, and joined the lonestar.org [[UUCP]] network. Three additional phone lines were installed in late 1991.
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[[File:Bye-bye-leenox.png|frameless|left|This happens when you type 'linux' as a command on SDF]] 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, Texas]] to [[Seattle]], [[Washington (state)|Washington]]. The Linux system was officially decommissioned on August 17, 2001. The occasion was captured in a [http://bch.sdf.org/bye-bye-leenox.htm COMMODE Log] preserved by one of SDF's users.<ref>{{cite web|url=http://bch.sdf.org/bye-bye-leenox.htm |title=pooderNet: bye-bye-leenox |publisher=Bch.sdf.org |access-date=2014-05-09}}</ref> (COMMODE is a [[TOPS-20|DEC TOPS-20]] [[Online chat|chat system]] ported by Jones to [[Unix]] as an executable [[KornShell]] script.)
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 [[Internal Revenue Service|IRS]].<ref>{{Cite web|title=Details about SDF Public Access UNIX System|url=https://apps.irs.gov/app/eos/detailsPage?ein=800016172&name=SDF%20PUBLIC%20ACCESS%20UNIX%20SYSTEM%20INC&city=&state=&countryAbbr=US&dba=&type=COPYOFRETURNS&orgTags=COPYOFRETURNS
{{As of|May 2016}}, SDF was composed of 47,572 users from around the world.{{citation needed|date=February 2019}} SDF users include engineers, computer programmers, students, artists and professionals.
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