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- Path: arlut.utexas.edu!khan!jerry
- From: jerry@arlut.utexas.edu (Jerry Heyman)
- Newsgroups: comp.sys.amiga.misc
- Subject: Re: AmigaOS 4.x features
- Date: 12 Mar 1996 20:32:50 GMT
- Organization: UT Applied Research Laboratories
- Message-ID: <4i4n1i$kf5@ns1.arlut.utexas.edu>
- References: <4h2p87$nu@news.rhrz.uni-bonn.de> <4hiq13$h6c@thebes.waikato.ac.nz> <2144.6639T1400T2921@Redrobe.demon.co.uk> <4ho7ou$2786@thebes.waikato.ac.nz> <4hsd9l$skq@murphy2.servtech.com> <4hvie4$1j7g@thebes.waikato.ac.nz> <ludde.826583913@nada.kth.se>
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- Erik Lundevall (ludde@nada.kth.se) wrote:
- : In <4hvie4$1j7g@thebes.waikato.ac.nz> sbh@cs.waikato.ac.nz (Stephen B Hodge) writes:
-
- : >nyle landas (nyle@cyber1.servtech.com) wrote:
- : >: Stephen B Hodge (sbh@cs.waikato.ac.nz) wrote:
- : >:
- : >: The CHRP standard isn't designed to do this. The machine is taken over by
- : >: the current OS running. What you are talking about would require some form
- : >: of OS switching which would be dificult to accomplish if it's possible.
- : >I realise all of this. What I was saying is that it would be nice (not that
- : >it would be possible).
-
- : Actually, IBM has been working to accomplish something similar. Their
- : "Workplace OS" is supposed to be able to run a number of "OS personalities"
- : which basically is an API framework for a specific OS. The underlying
- : services are provided by some common base.
- : It isn't actually a number of different OSes running at the same time, but
- : you would be able to run software written for a number of different OSes
- : at the same time. Which for most people probably would be the main point.
-
- Workplace OS was to be built around a modified Mach 3.0 Microkernel. This
- is now referred to as the IBM MicroKernel, and is the basis for OS/2 on the
- PowerPC. But, since IBM has announced that no further development will be
- done on OS/2 for PPC in 1996, where it all goes is anyone's guess.
-
- The original goal was to be able to run multiple OSes concurrently. That
- eventually was shelved as there was no perceived customer demand, and it
- lead to some VERY challenging problems. One of problems was how to swap
- endian mode while reading/writing files and/or in memory. Remember, the PPC
- CPU can boot is bi-endian, but selects one mode to run in when it is booted.
- From what I remember, the MicroKernel was little endian.
-
- jerry
- (Former IBM employee, MicroKernel performance)
-
- : --
- : -Erik Lundevall
- : WWW: http://www.algonet.se/~erikl/
-
- --
- Jerry Heyman | jerry@arlut.utexas.edu O-
- Tactical Simulation Division | http://www.arlut.utexas.edu/~jerry/main.html
- Applied Research Laboratories of UT Austin | "Software is the difference
- P.O. Box 8029, Austin, TX 78713-8029 | between hardware and reality"
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