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From: mwm@eris.berkeley.edu
Newsgroups: net.unix
Subject: Re: 4BSD is dead???
Message-ID: <894@jade.BERKELEY.EDU>
Date: Sat, 21-Jun-86 05:14:10 EDT
Article-I.D.: jade.894
Posted: Sat Jun 21 05:14:10 1986
Date-Received: Sun, 22-Jun-86 13:23:37 EDT
References: <440@geowhiz.UUCP> <13200008@gorgo.UUCP>
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In article <13200008@gorgo.UUCP> bsteve@gorgo.UUCP writes:
>Lets get it all straight.

Hi steve. Not a bad idea; sorry I have to correct you.

>CMU has an implementation of a modularized os kernel
>that is inspired by UNIX and its numerous parents. They have separated the the
>execution path of a process into a task (consisting of pieces atomic to the
>processor) and an execution thread.

Correct so far.

>It currently (MACH-1) offers source level compatibility with 4.3BSD UNIX.

First, the MACH kernel I have says "MACH/4.3/2.1" (or something
similar, I don't have a console log handy :-) when it boots. Second,
it is not merely source compatible with 4.3, it's BINARY compatible. I
copied a MACH kernel onto a 4.3 system, rebooted, and found nothing
wrong (ps worked, etc.). Nothing got recompiled.

I expect this to compatability to stay in the system, but not being a
MACH developer, can't say for sure.

	<mike