This is an archive of the last "official" release of MiNT, a multi-tasking operating system for the Atari ST. I wrote it back in the 1990s, and Atari licensed it and then hired me to work on it.
It's mainly of historical interest at this point, but I'm putting it up for others to use. The copyright is given below; it's fairly liberal, but not exactly like any other open source license.
Copyright 1990,1991,1992 Eric R. Smith. Copyright 1992,1993,1994 Atari Corporation All rights reserved.
MINT is still under development, and is probably still very buggy. Treat it as you would any experimental software; with extreme caution. Please read the following notice carefully:
THE MiNT SOURCE CODE AND EXECUTABLES ARE PROVIDED FREE OF CHARGE, AS IS. ATARI CORPORATION AND ERIC R. SMITH MAKE NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THIS CODE, AND IN PARTICULAR SPECIFICALLY DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTIBILITY OR FITNESS FOR A PARTICULAR PURPOSE. USE THIS CODE AT YOUR OWN RISK.
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION, AND MODIFICATION
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Redistribution and use of unmodified verbatim copies of MiNT (in either source or binary forms) are permitted, provided that the above copyright notices and this documentation are distributed along with all such copies of MiNT.
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Redistribution of modified copies of the source code of MiNT, or of binaries compiled from such modified copies, is permitted under the terms of paragraph 1 above, provided also that the following conditions are adhered to:
a) all modified files must carry prominent notices stating that the files have been changed, and the date of any change; and
b) any binary compiled from a modified version of the MiNT source code must, when executed, print a notice stating that it is a modified version of MiNT; and
c) any work that is based in whole or in part on MiNT must be licensed, at no charge, to all third parties under the terms of this license. Mere aggregation of a work with another work based upon MiNT does not cause it to fall under this clause.
In plain English: (1) means you can copy unmodified versions of MiNT, with the only restriction being that you must preserve copyright notices, and include a copy of this file. (2) Means that if you modify your version of MiNT, you can redistribute it as long as you keep the original copyright notices (including this file), you clearly indicate that it is a modified version, and you agree that anyone you give it to can also give it away. If you bundle MiNT (or a modified version of MiNT) with another program, that other program does not fall under the terms of this license, but the copy of MiNT (or the modified version of MiNT) does, and hence must remain freely copyable.