The SDF logo, a decscope.

Super Dimension Fortress (SDF, also known as freeshell.org) is one of the oldest and largest nonprofit public access UNIX systems on the Internet. Image File history File links Sdf. ... Image File history File links Sdf. ... Unix (officially trademarked as UNIX) is a computer operating system originally developed in the 1960s and 1970s by a group of AT&T employees at Bell Labs including Ken Thompson, Dennis Ritchie, and Douglas McIlroy. ...

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 having originally been a BBS for anime fans. 1987 (MCMLXXXVII) was a common year starting on Thursday of the Gregorian calendar. ... A nonprofit organization (abbreviated NPO, or non-profit or not-for-profit) is an organization whose primary objective is to support some issue or matter of private interest or public concern for non-commercial purposes. ... Anime ) (IPA pronunciation: in Japanese, but typically or in English) is an abbreviation of the word animation. Outside Japan, the term most popularly refers to animation originating in Japan. ... The Super Dimension Fortress Macross ) is an anime television series. ... Интерестные знакомстав! Заходим и знакомимся! <a href=http://poiu. ...

Services

The system currently includes NetBSD servers for regular use (DEC Alphas) as well as a TWENEX system. Besides offering free Unix shell access to its users, SDF provides dialup access and web and Gopher hosting - making it one of very few servers still running the latter protocol. NetBSD is a freely redistributable, open source version of the Unix-like BSD computer operating system. ... DEC Alpha AXP 21064 Microprocessor The DEC Alpha, also known as the Alpha AXP, is a 64-bit RISC microprocessor originally developed and fabricated by Digital Equipment Corp (DEC). ... The TOPS-20 operating system by DEC - the second proprietary OS for the PDP-10 - preferred by most PDP-10 hackers over TOPS-10 (that is, by those who were not ITS or WAITS partisans). ... Screenshot of a sample Bash session, taken on Gentoo Linux. ... WWWs historical logo designed by Robert Cailliau The World Wide Web (WWW or simply the Web) is a system of interlinked, hypertext documents that runs over the Internet. ... Gopher is a distributed document search and retrieval network protocol designed for the Internet. ...

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^[1]

History

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 a Intel x86 UNIX clone called Coherent. The Apple IIe was the third model in the Apple II line of personal computers, produced by Apple Computer. ... The Commodore 64 was one of the most popular microcomputers of its era, and is the best selling home computer of all time. ... For Australian-based Objectivist Prodos Marinakis and the prodos institute, see here. ... This article belongs in one or more categories. ... Coherence is from Latin cohaerere = stick together, to be connected with). ...

Unhappy with the restrictive menu driven structure of a BBS, Uhlemann, Jones and Daniel Finster created a System V UNIX 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. Unix (officially trademarked as UNIX) is a computer operating system originally developed in the 1960s and 1970s by a group of AT&T employees at Bell Labs including Ken Thompson, Dennis Ritchie, and Douglas McIlroy. ... UUCP stands for Unix to Unix CoPy. ...

In the fall of 1992, Uhlemann and Finster left SDF to start one of the first commercial Internet companies in Texas, Texas Metronet.

SDF continued to grow, expanding to ten lines in 1993 along with a SLIP connection provided by cirr.com. UUCP was still heavily relied upon for Usenet news and email. In 1994 SDF members formed a membership which would shape the future and create what SDF is today. In telecommunications, a slip is a positional displacement in a sequence of transmitted symbols that causes the loss or insertion of one or more symbols. ... Usenet (USEr NETwork) is a global, distributed bulletin board system (BBS). ...

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."^{[citation needed]} Linux, or GNU/Linux, refers to any Unix-like computer operating system which uses the Linux kernel. ...

In part due to the number of attacks undertaken by malicious users against SDF, in 2000, SDF migrated from Linux to NetBSD and from Intel x86 to DEC Alpha. NetBSD is a freely redistributable, open source version of the Unix-like BSD computer operating system. ... x86 or 80x86 is the generic name of a microprocessor architecture first developed and manufactured by Intel. ... DEC Alpha AXP 21064 Microprocessor The DEC Alpha, also known as the Alpha AXP, is a 64-bit RISC microprocessor originally developed and fabricated by Digital Equipment Corp (DEC). ...

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 subsequentially granted 501(c)(7) non-profit membership club by the IRS. This is most likely due to the fact that SDF was operating under the auspice of the MALR corporation between 1995 and 2001. October 1 is the 274th day of the year (275th in leap years) in the Gregorian calendar. ... This article is about the year 2001. ... Official language(s) None Capital Dover Largest city Wilmington Area  Ranked 49th  - Total 2,491 sq mi (6,452 km²)  - Width 30 miles (48 km)  - Length 100 miles (161 km)  - % water 21. ... A 501(c) is a specific type of tax exempt non profit organization designated under Section 501(c) of the United States Internal Revenue Code (see ). There are 27 types of tax exempt organizations under the code. ... IRS is short for U.S. Internal Revenue Service short for Indian Revenue Service short for Independent rear suspension, used in automobiles. ...

Current status

The servers that comprise the SDF, as of 2006.

SDF is now composed of more than 30,000 users from around the world. SDF users are diversified, including engineers, computer programmers, students, artists and professionals. ^{[citation needed]} Image File history File linksMetadata Sdf-servers. ... Image File history File linksMetadata Sdf-servers. ...

See also

• Shell provider

Shell providers are companies which provide shell accounts, user accounts on Unix, Linux, or similar systems, from which the user may run certain programs for a variety of purposes. ...

External links

• SDF's website
• http://sdf-eu.org (European site)
• (Japanese) http://sdf-jp.org
• gopher://sdf.lonestar.org] (Gopher site)
• ftp://sdf.lonestar.org (FTP site)
• telnet://sdf.lonestar.org (telnet) - login as new to create account
• Interview with Stephen Jones at bsdtalk (MP3)