Path: utzoo!mnetor!tmsoft!torsqnt!news-server.csri.toronto.edu!rpi!usc!wuarchive!uunet!maverick.ksu.ksu.edu!chepil!wagner From: wagner@chepil.weru.ksu.edu (Larry Wagner) Newsgroups: comp.os.msdos.apps Subject: Re: QEMM, etc Recommendation Sought Message-ID: <1991Mar27.203655.6019@maverick.ksu.ksu.edu> Date: 27 Mar 91 20:36:55 GMT References: <1991Mar21.173016.27609@ssd.kodak.com> <4734@gumby.Altos.COM> Sender: news@maverick.ksu.ksu.edu (The News Guru) Organization: Kansas State University Lines: 42 valley@uchicago (Doug Dougherty) writes: >jerry@gumby.Altos.COM (Jerry Gardner) writes: >>In article ersys!davem@nro.cs.athabascau.ca (Dave McCrady) writes: >>> Having said all that .. I guess the short answer to your question is >>>yes ... IF your machine has expanded memory. Extended memory can't be >>>mapped to high ram. >>This is an incorrect statement. On a 386 machine, QEMM does map extended >>memory to high RAM. Most 386 machines don't have true expanded memory, >>this feature is provided by QEMM by remapping extended memory. A 386 running >>in protected mode can remap RAM in any location to any other location. >This is nitpicking. Actually, what happens is that the 386 memory >manager emulates expanded memory in software, using the memory mapping >capabilities of the processor. Then the expanded memory is used as >"high ram". But the point is, it is true expanded memory. >It is definitely the case that extended memory (qua extended memory) >can't be mapped to high ram. Since I couldn't reach your mail address, I'll follow up here with my questions. I pulled out my QEMM386 manual and what you say is correct with regards to QEMM386 mapping expanded memory into high memory. However, the question I have, is if Quarterdeck had wanted to, couldn't they have just done the mapping of extended memory to high memory rather than extended to expanded to high memory? Or is it the fact that how expanded memory is dealt with is more standardized? Or is there another technical reason why? Just curious. -- -------------------------------------------------------------------------------- Larry E. Wagner | wagner@chepil.weru.ksu.edu USDA-ARS Wind Erosion Research Unit | wagner@matt.ksu.ksu.edu 105B East Waters Hall, KSU | ...!{rutgers,texbell}!ksuvax1!weru!wagner Manhattan, KS 66506 |phone (913)532-6807 --------------------------------------------------------------------------------