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- Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
- Path: sparky!uunet!paladin.american.edu!auvm!CUNIXB.CC.COLUMBIA.EDU!PJB3
- Message-ID: <CMM.0.90.0.712344836.pjb3@cunixb.cc.columbia.edu>
- Date: Tue, 28 Jul 92 13:33:56 EDT
- Sender: Nota Bene List <NOTABENE@TAUNIVM>
- From: "Paul J. Bodin" <pjb3@CUNIXB.CC.COLUMBIA.EDU>
- Subject: Re: Blums's UMB driver and huge free RAM for NB
- Comments: To: Nota Bene List <NOTABENE%TAUNIVM.BITNET@ricevm1.rice.edu>
- Newsgroups: bit.listserv.notabene
- In-Reply-To: Your message of Tue, 28 Jul 92 12:09:00 EDT
- Lines: 29
-
- Ted Parkinson writes:
-
- > Perhaps someone could answer a question about the amount of memory freed
- > up here. Although I can't see it in the config.sys file, it seems to me
- > that a huge chunk of the free memory comes from disabling the vga memory
- > which gives you another 60-70k above the 640k. If this is the case then
- > N.B. won't run in the 50 line mode which I like, and that is why Windows
- > won't load as well. Am I right, or just confused? If Blum's UMB gives
- > me over 700k _with_ vga graphics still loaded, then I'm excited. But if
- > not, then I can't see how it's much better than qemm or the dr-dos memory
- > manager which I use now.
-
- You have it exactly right. The use of A000-AFFFh as DOS memory
- disables VGA graphics. QEMM with VIDRAM will do exactly the same
- thing, and even give you more UMBs because it will use Stealth to
- allow you to use the ROM BIOS addresses for UMBs too. In some cases,
- QEMM will also allow you to link available UMBs to DOS memory so that
- programs will see it as contiguous, usable DOS memory. Any time you
- want to use actual VGA video, though, you cannot use these features of
- any memory manager, and you are forced back inside the old 640K DOS
- barrier.
-
- Windows, relying as it does on the graphics mode of your video card,
- will be completely messed up by these memory techniques.
-
- ___________________________________________________________________________
- Paul J. Bodin Internet: pjb3@cunixb.cc.columbia.edu
- Union Theological Seminary smail: 435-52nd Street
- (718) 439-3549 Brooklyn, NY 11220
-