Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!lll-winken!uunet!zephyr.ens.tek.com!tektronix!sequent!ccssrv!perry
From: perry@ccssrv.UUCP (Perry Hutchison)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Why is DOS limited to 640K?
Message-ID: <757@ccssrv.UUCP>
Date: 25 Oct 89 07:44:12 GMT
References: <16320@dartvax.Dartmouth.EDU> <5049@bgsuvax.UUCP>
Reply-To: perry@ccssrv.UUCP (Perry Hutchison)
Organization: Control-C Software, Inc., Beaverton, OR
Lines: 11

In article <5049@bgsuvax.UUCP> bedra@bgsuvax.UUCP (craig bedra) writes:

> ... for a 286 with an EGA card to extend base memory 64K.  I have checked
> Simtel and all they have is stuff for use with CGA ...

The reason there is no program to do this with an EGA is that, in some
display modes, the EGA's buffer space starts at the 640K boundary.  If you
can guarantee that none of your programs will try to set EGA graphic modes,
the CGA stuff might work.  (You can still use the higher-resolution but
otherwise CGA-compatible text modes.)  If you actually need EGA graphics,
you're stuck with 640K max.