Requesting info on UNIX look-alikes

[Rich Wales]

I would like to find out as much as possible about any UNIX look-alikes.

By "look-alike" I mean a system whose program interface looks like UNIX
(be it 4.1BSD, 4.2BSD, System III, System V, or whatever) -- but whose
internals have been rewritten from the ground up and are not based on
AT&T or Berkeley sources.

Hence, I am NOT asking for information about "ports" of UNIX code to new
machines.  UNIX look-alikes which run on top of another operating system
are interesting to me, though -- as long as the look-alike was written
from scratch and is not simply a "port" of AT&T or Berkeley code.

I am primarily interested in look-alike KERNELS.  If you know of a sys-
tem where the kernel has been rewritten but the AT&T/Berkeley library
routines (such as /lib/libc.a) have not been rewritten, I would still
like to know about that system.

For any such system which you know about, I would like to get at least
the following information:

(1) Name of the system, and the company or group which developed it.

(2) When was it developed?  How long did it take to develop it?

(3) What hardware does it run on?

(4) What are its significant internal differences from AT&T or Berkeley
    UNIX?  Generalities in the spirit of the following are good enough
    (I'm certainly not asking anyone to divulge trade secrets!):

    (a) "The scheduler supports real-time processing."
    (b) "Device drivers can be installed dynamically, a` la VMS."
    (c) "Dynamically linked run-time libraries are supported."

(5) Is it object-code compatible with any AT&T or Berkeley version of
    UNIX?  If it is not completely compatible, what doesn't it do?

(6) Are there any significant capabilities of the look-alike which are
    not in AT&T or Berkeley UNIX systems?  (The answer to this question
    may admittedly overlap that of question #4 above.)

(7) How does the performance of the look-alike compare with an AT&T or
    Berkeley UNIX version for the same hardware (if one is available)?

(8) Is the rewritten source available, or is the look-alike sold only
    in object form?

(9) How much does it cost?  (If available in both source and object
    forms, what is the cost for each?)

(10) Does the look-alike's vendor require that the purchaser of the
    look-alike have a source-code UNIX license from AT&T or Berkeley?
    If not, is an object-code license required instead?

Please reply DIRECTLY TO ME; I will post a summary to the net in a
couple of weeks.

Oh, I almost forgot --

    UNIX is a trademark of Bell Labs, AT&T, or somebody like that.
    VMS is a trademark of Digital Equipment Corporation.
    Berkeley is a trademark of the Regents of the University of
	California.  :-}

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                                                             Rich Wales
                           University of California, Los Angeles (UCLA)
                                            Computer Science Department
                                                      3531 Boelter Hall
                                   Los Angeles, California 90024 // USA
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Phone:    (213) 825-5683 // +1 213 825 5683
ARPANET:  wales at UCLA-LOCUS.ARPA
UUCP:     ...!{cepu,ihnp4,trwspp,ucbvax}!ucla-cs!wales
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       "From Anywhere, To Anywhere" is a trademark of AT&T.  :-}
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