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- Xref: sparky comp.os.coherent:3325 comp.os.minix:3784
- Newsgroups: comp.os.coherent,comp.os.minix
- Path: sparky!uunet!caen!mtu.edu!kwfriber
- From: kwfriber@mtu.edu (Kenberg Frieth)
- Subject: Re: OS compare (Unix/clone)
- Message-ID: <1992Jul28.154817.5839@mtu.edu>
- Organization: Michigan Technological University
- References: <1992Jul24.001255.13675@csx.cciw.ca> <michaelv.711988050@help.cc.iastate.edu> <PETRI.VIRKKULA.92Jul27231025@vipunen.hut.fi>
- Date: Tue, 28 Jul 1992 15:48:17 GMT
- Lines: 26
-
- In article <PETRI.VIRKKULA.92Jul27231025@vipunen.hut.fi> Petri.Virkkula@hut.fi (Petri Virkkula) writes:
- >On Fri, 24 Jul 1992 14:27:30 GMT, michaelv@iastate.edu (Michael L. VanLoon) said:
- >
- >
- >Michael> I stand by my statement. You can't do it on an XT. And, you can't do
- >Michael> it well on a 286. Two important things that are missing: large address
- >Michael> model and true virtual memory. This is why you'll never see a
- >Michael> full-featured unix on a 286, and why the top of the line for the 286
- >Michael> will be crippled OS's like Coherent 3.2.1 (which does a great job with
- >Michael> what it has to work with) and SCO Xenix 286. Heck, you can't even use
- >Michael> all the features of MS-Windoze on a 286, and OS/2 doesn't even bother
- >Michael> trying with version 2.0. Because they can't do the things they want to
- >Michael> do without a) flat memory addressing and b) true virtual memory.
- >
- > But 286 has flat addressing and possibility for virtual memory
- > in protected mode. However none of operating systems that I
- > have used doesn't just take advantage of all 286's features.
- >
- > Petri
- The 286 has does not have flat addressing. It is still segmented. Also,
- it does not support virtual memory directly (although, one could probably
- do it in software). The 286 does have some memory protection, and does
- have protection levels for some instructions.
-
- Ken Friberg
-
-