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- Newsgroups: comp.os.os2.misc
- Path: sparky!uunet!newsflash.concordia.ca!mizar.cc.umanitoba.ca!news!buhr
- From: buhr@umanitoba.ca (Kevin Andrew Buhr)
- Subject: Re: LOADHIGH: How does it work in OS/2 (simulated DOS) ?
- In-Reply-To: pynq@quads.uchicago.edu's message of 15 Dec 92 05:18:39 GMT
- Message-ID: <BUHR.92Dec18105920@ccu.umanitoba.ca>
- Sender: news@ccu.umanitoba.ca
- Nntp-Posting-Host: ccu.umanitoba.ca
- Organization: University of Manitoba, Canada
- References: <1992Dec15.051839.12892@midway.uchicago.edu>
- Date: Fri, 18 Dec 1992 16:59:20 GMT
- Lines: 36
-
- In article <1992Dec15.051839.12892@midway.uchicago.edu>
- pynq@quads.uchicago.edu (Jeremy Mathers) writes:
- :
- : I am an old hand at using QEMM's loadhi commands, but I don't understand
- : the loadhigh command in OS/2's simulated DOS. How does it work?
- : What can be loaded high? How can you tell what is loaded high?
- :
- : It looks like it is patterned after the LOADHIGH in DOS 5.0, which I
- : never learned anything about. (I always thought DOS 5.0 was a crude
- : imitation/hack of DOS 3.31 with QEMM)
-
- OS/2's simulated DOS is more or less just like DOS 5.0. The LOADHIGH
- command under OS/2 behaves the same way DOS 5.0's does. Under OS/2, I
- understand that it is possible (by dropping certain video modes and
- what not), to increase the RAM available below the 1 Meg limit to well
- beyond the best DOS 5.0 alone can deliver. In this case, using
- "LOADHIGH" under OS/2 may be superior to using it under DOS 5.0.
-
- In short, though, the "LOADHIGH" command simply places the program
- being loaded into a UMB (upper memory block) between the 640K and 1
- Megabyte marks, if possible. You must have the "UMB" setting on for
- this feature to do anything special. You can place "DOS=UMB" in your
- OS/2 CONFIG.SYS (use "DOS=UMB,HIGH" if you want the DOS kernel loaded
- into high memory, too), and you can manipulate the DOS session
- settings individually (I think they're both under the "DOS_HIGH"
- setting, but I don't remember).
-
- If you want to see how DOS is using the memory, I believe you can run
- the "MEM" command. I know this command comes with DOS 5.0, and I
- think it's included in the OS/2 simulated DOS distribution. If so, it
- will show you where the TSR's have been loaded, and which, if any, got
- put in high memory.
-
- Sorry I can't check for sure...
-
- Kevin <buhr@ccu.UManitoba.CA>
-