Path: utzoo!attcan!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!ames!ncar!asuvax!mcdphx!mcdchg!ddsw1!ddsw1!point!wek
From: wek@point.UUCP (Bill Kuykendall)
Newsgroups: comp.sys.ibm.pc
Subject: Re: V86 mode in 386 machines
Message-ID: <[2717.2]comp.ibmpc;1@point.UUCP>
Date: 27 Oct 89 12:00:04 GMT
References: <8910231849.AA21907@euler.Berkeley.EDU> <8326@leadsv.UUCP>
Lines: 14

>There currently several packages can utilize the V86 mode of 386. 
>(MS/Windows, DESQView, etc.) However, I found none of them can give
>a user a full 640KB (or at least 600KB) in the virtual 86 mode.

I doubt you're getting more than 600k now.  'DOS loads into the 640k space
leaving about 591,000 bytes free on most of my systems running Compaq DOS
3.31.  With Desqview & QEMM, the worst case (with EGA or VGA) winds up
costing about 10k extra (assuming that you have extended memory that
Desqview can use).  The best case (with Hercules or CGA) can net you an
*increase* in available program space (over 700k!).  This is possible
because QEMM will append unused video RAM area to the 640k, yielding as much
as 736k for 'DOS.  Desqview will use high memory (between top-of-video and
bios addresses) and LIM 4.0 (created by QEMM from extended memory above 1MB)
to store all but 10k of it's code.