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From: hartung@crl.ucsd.edu (Jeff Hartung)
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: High memory mapping (was Re: DOS 5.0)
Keywords: vga high memory
Message-ID: <18691@sdcc6.ucsd.edu>
Date: 26 Apr 91 20:10:24 GMT
References: <1991Apr22.113002.4147@sun1.ruf.uni-freiburg.de> <1991Apr25.205919.3812@sj.ate.slb.com> <1991Apr25.235234.27452@agate.berkeley.edu>
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Organization: University of California, San Diego
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In article <1991Apr25.235234.27452@agate.berkeley.edu> c60b-1eq@e260-1a.berkeley.edu (Noam Mendelson) writes:
<In article <1991Apr25.205919.3812@sj.ate.slb.com> poffen@SunOS (Russ Poffenberger) writes:
<>In article <1991Apr22.113002.4147@sun1.ruf.uni-freiburg.de> hartnegg@sun1.ruf.uni-freiburg.de (Klaus Hartnegg) writes:
<>>I have 645k free conventional memory with Dos 3.3 and Qemm 5.11 with
<>>several devices and TSR's installed.
<>This must be because you have a system, that allows you to map unused lower
<>memory addresses as useable conventional memory, so that total base memory
<>is something like 704K. This is kind of cheating since many people can't do
<>this. (VGA, don't have the chipsets that allow it, etc).
<        ^^^
<You can remap up to 96K of your VGA or 256K EGA's memory as conventional
<memory (I know of at least one shareware program which does this).

This only works until your VGA attempts to put itself into a graphics mode.
If you're using any video RAM as conventional RAM at this time and your
program can't trap the attempt to use a graphics mode, your system (or at
least your program) will probably come to an abrupt halt.

-- 
 --Jeff Hartung--  	
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