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From: dorner@pequod.cso.uiuc.edu (Steve Dorner)
Newsgroups: comp.sys.mac,comp.sys.mac.programmer
Subject: Re: Todd Rundgren's Macintosh OS
Message-ID: <1989Sep27.220839.13648@ux1.cso.uiuc.edu>
Date: 27 Sep 89 22:08:39 GMT
References: <16409@brunix.UUCP> <4399@internal.Apple.COM>  <32895@srcsip.UUCP>
Sender: news@ux1.cso.uiuc.edu (News)
Reply-To: dorner@pequod.cso.uiuc.edu (Steve Dorner)
Organization: University of Illinois at Urbana-Champaign
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In article <32895@srcsip.UUCP> mnkonar@src.honeywell.com (Murat N. Konar) writes:

>As I understand it, there is no "emulation" of UNIX on top of
>Mach, rather Mach is a UNIX variant (a cool one) that is compatible
>with Berkley UNIX 4.3

The mach kernel is a pretty basic operating system, providing only
minimal services.  You *always* put something "on top of" mach;
in this way, it's somewhat like IBM's VM.

NeXT has put 4.3bsd UNIX "on top of" mach; sometimes, this combination
is referred to as "mach", but that's not *really* correct.

Finally, NeXT has a windowing environment, called NeXTStep, that runs
on top of UNIX, that runs on top of mach.


-- 
Steve Dorner, U of Illinois Computing Services Office
Internet: s-dorner@uiuc.edu  UUCP: {convex,uunet}!uiucuxc!dorner
IfUMust:  (217) 244-1765