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- From: mcastle@mcs213f.cs.umr.edu (Michael R Castle)
- Subject: Re: Is dos 6.0 gonna multitask? Or have no memory barrier????
- References: <1992Nov10.174211.1@csc.canterbury.ac.nz> <1992Nov10.060504.10390@netcom.com> <BxKoEC.JC8@news.cso.uiuc.edu>
- Date: Fri, 13 Nov 1992 00:53:16 GMT
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- Organization: University of Missouri - Rolla
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- Message-ID: <1992Nov13.005316.7306@umr.edu>
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-
- In article <BxKoEC.JC8@news.cso.uiuc.edu> walk@mrcnext.cso.uiuc.edu (Todd Walk) writes:
- >DOS doesn't have a 640K barrier. DOS will use as much CONTINOUS memory it
- >can find. Since the upper 384K of the 1st meg. is reserved for hardware,
- >(and bios) DOS can only "see" 640K. One thing that may be possible is
- >to use to 386 memory mapping to fool DOS into thinking that more memory
- >is availiable, and then having a device driver handle the mem. swaps.
- >
- >
- > Todd Walk
- > walk@mrcnext.cso.uiuc.edu
- >
-
- Even then, real mode apps can still only access 1m of memory because of the
- segment:offset method. Of course, if the next dos had dpmi built it, at
- least we would have a definitive base to work from to use more than 1m of
- memory in protected mode, and we're back to os/2 or nt again. maybe they
- could use nt as the protect-mode-with-real-mode-after-thought os, and use
- dos [67].x as the real-mode-with-protected-mode-after-thought os. Attack
- the market from both ends :-> (though the latter might provide more
- compatibility for existing apps, they still wouldn't be able to take
- advantage of better dos capabilities).
-
- mrc
-