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- Newsgroups: comp.sys.intel
- Path: sparky!uunet!charon.amdahl.com!pacbell.com!ames!data.nas.nasa.gov!win31.nas.nasa.gov!fineberg
- From: fineberg@win31.nas.nasa.gov (Samuel A. Fineberg)
- Subject: Re: Idea for the P5!
- References: <1992Nov18.203321.18612@msuinfo.cl.msu.edu>
- Sender: news@nas.nasa.gov (News Administrator)
- Organization: CSC, NASA Ames Research Center, NAS Division
- Date: Wed, 18 Nov 92 22:29:27 GMT
- Message-ID: <1992Nov18.222927.20422@nas.nasa.gov>
- Reply-To: fineberg@nas.nasa.gov
- Distribution: usa
- Lines: 50
-
- In article <1992Nov18.203321.18612@msuinfo.cl.msu.edu>, sundaram@eecae.msu.edu writes:
- |>
- |> Hi y'all,
- |>
- |> I had a couple of ideas for how Intel could keep backward compatibility with
- |> its 80x86 line of processors without having to dedicate a small part of the
- |> P5 to emulating 80[3|4]86 code.
- |>
- |> Instead of devoting part of the die to emulate 80x86 code, why not include some
- |> instructions that will allow the P5 to act as a master processor to a true
- |> (or slightly modified) 80x86 chip.
- |>
- |>
- |> So, if you run a program run for the 386 on the P5, it will "make" the
- |> 386 execute them instead and can handle other tasks. The idea is similar
- |> to the DOS VDM's in IBM's OS/2. These VDM's can run most DOS 5.0 apps,
- |> but the "OS" they run is not DOS 5.0. Similarly, this chip will not
- |> quite be a true 486 but one slightly hacked to allow it to co-operate
- |> with the P5 and work with it as a slave processor. This MAY include
- |> some incompatibilities with existing software, but these can be
- |> virtually eliminated by intelligent design etc. Moreover, this will
- |> allow users to keep their old 80x86 based software while allowing them
- |> to step up to the P5 (or the P6, P7 .... ) and its advanced features
- |> and superior performance. The P5 could be sold independently, so that
- |> users who need x86 compsatibility can "upgrade" to it when necessary.
- |> Also, motherboards for the P5 could have a built in socket for the
- |> 486 compatible (intel) micro-(co)-processor.
- |>
- |> OK, This mirror's OS/2 2.0 's setup quite closely, where DOS/Windows
- |> support is optional and some programs (like WPWIN 5.1) need to be
- |> "fixed" before being able to run under a WINOS2 session. However, the
- |> setup does provide for compatibility with over 95% of the DOS software
- |> out there. Could this be done for the P5?
- |>
- |>
- |> Voila!
- |>
- |> Now, don't flame me. This is just an idea. I do not know how feasible this is
- |> going to be. I will let you decide.
- |>
- |> Later y'all
- |>
- |> Divya
- |> (sundaram@egr.msu.edu)
- I think the main problem is that its done. The P5 is no longer under development
- (though they may still be debugging it). Also, there is no P5 any more, it is
- called the Pentium CPU. Sure the name is stupid, but its too late to change
- that either. Maybe you should concentrate on the P6?
-
- Sam
-