Path: utzoo!attcan!uunet!decwrl!elroy.jpl.nasa.gov!ncar!boulder!ub!image.soe.clarkson.edu!rpi!picasso.ipl.rpi.edu!onders
From: onders@picasso.ipl.rpi.edu (Timothy E. Onders)
Newsgroups: comp.sys.atari.st
Subject: Re: "DOS machines" (Was: TT (Who has one?))
Keywords: long
Message-ID: <WH5$NS%@rpi.edu>
Date: 30 Jul 90 14:09:25 GMT
References: <1990Jul19.135115.2032@cunixf.cc.columbia.edu> <1990Jul19.160526.2215@arcsun.arc.ab.ca> <6764@vax1.acs.udel.EDU> <692@cvbnetPrime.COM> <3160@rwthinf.UUCP> <701@cvbnetPrime.COM>
Organization: Central Services Systems Development
Lines: 20

In article <701@cvbnetPrime.COM> jshekhel@feds19.UUCP (Jerry Shekhel ) writes:
>Oh yeah.  And I suppose Motorola thought about virtual memory management
>and UNIX when they burned the original 68000 into silicon?  Why is it, then,
>that the 286 can run a real OS with virtual memory and protected address
>spaces for each process (UNIX System V), and the 68000 can't?  Am I missing
>something here?

Think about the claims you're making. Note the fact that you are comparing
the 80286, Intel's second generation of the 80x86 line, to the 68000,
Motorola's first generation of the 680x0 line.  If you compare it to the
68010, you'll find full vm support, and a lot of nice features, such as
linear address space, normal data format, a stack that grows in the right
direction, &c.  If you're going to compare Blueberries to Oranges, you're
not going to be accurate.  And, anyway, the 68000 can, but the ST's MMU,
since you seem to be basing your experience on the ST, can't.  With a
proper MMU, the 68000 had "protected(supervisor)" mode long before the
80x86 architecture.
					Tim Onders
					Systems Engineer
					Grumman Aerospace Corp.