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From: jcmorris@mwunix.mitre.org (Joe Morris)
Newsgroups: comp.sources.d
Subject: Re: What documentation is fair/legal to use to develop clone software?
Message-ID: <115097@linus.mitre.org>
Date: 28 Jul 90 17:06:12 GMT
References: Lots and lots
Sender: usenet@linus.mitre.org
Reply-To: jcmorris@mwunix.mitre.org (Joe Morris)
Organization: The Mitre Corporation
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In article <jb0lh55m9@tmsoft.uucp> mason@tmsoft.UUCP (Dave Mason) writes:
>
>The question is: What can I base my knowledge on [in writing a clone]?
>  [...]
>I'd really like to hear from people that have actually developed PD
>clones (Henry, Ozan, AST, RMS, other FSF, ...) 
>  [...]
For an example of a quite successful cloning of UNIX (tm and all that) see
Andy Tannenbaum's MINIX system.  He took the UNIX externals and wrote the
entire system to support them without using a single line of AT&T copyrighted
code.  The text (which includes a lot of the MINIX 1.0 source) is titled
_Operating_Systems:_Design_and_Implementation_.  Both the book and the
machine-readable (including SOURCE!!!) are available from Prentiss-Hall
by mail order.  Some software storefronts (WaldenSoftware, Computer Literacy,
etc.) stock the book; I haven't ever seen the disks in a store (but haven't
really looked that hard).

There's also a USENET newsgroup on MINIX: comp.os.minix .