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- Newsgroups: comp.sys.ibm.pc.misc
- Path: sparky!uunet!mcsun!sun4nl!dutrun!donau!dutecaj.et.tudelft.nl!linstee
- From: linstee@dutecaj.et.tudelft.nl (Erik van Linstee)
- Subject: Re: Disappearing UMB's, get this.
- Message-ID: <1993Jan06.105557.6425@donau.et.tudelft.nl>
- Sender: news@donau.et.tudelft.nl (UseNet News System)
- Nntp-Posting-Host: dutecaj.et.tudelft.nl
- Organization: Delft University of Technology, Dept. of Electrical Engineering
- References: <1993Jan01.181352.6500@donau.et.tudelft.nl> <1993Jan4.173117.14082@dcatlas.dot.gov> <4857@cruzio.santa-cruz.ca.us>
- Date: Wed, 06 Jan 1993 10:55:57 GMT
- Lines: 47
-
- aki@cruzio.santa-cruz.ca.us writes:
-
- >In article <1993Jan4.173117.14082@dcatlas.dot.gov>, joet@dcatlas.dot.gov (Joe Trott) writes:
- >> linstee@dutecaj.et.tudelft.nl (Erik van Linstee) writes:
- >> >The funniest thing happened to me. Yesterday, when I booted my
- >> >dos partition, I noticed I had no UMB's. I was rather surprised,
- >> >since I hadn't changed anything since I last used dos.
- >> >And behold, the himem.sys and emm386.exe settings were still
- >> >ok, yet, from the dos prompt (4dos or command.com) I could not
- >> >see any UMB's, emm386 repports 0 bytes available/free UMB
- >> >but a correct UMB start segment (C800), SI repports no UMB server
- >> >present, BUT the drivers in DEVICEHIGH's were loaded high and
- >> >functioning!!!
- >>
- >> Are you sure they were up high?
- >> Sounds like some of your BIOS settings may have been changed, such as the ones
- >> for shadow RAM. How much RAM is in your system?
-
-
- >Actually I've had UMB's disappear from MEM command's output,
- >however they were still there (of course). I haven't yet
- >been able to find the source of the problem, but it looks
- >very much like a bug in DOS 5.
-
- >I may not know exactly where the bug is coming from, but it's
- >not in configuration or anything like that. My bet is that
- >DOS overwrites it's pointer to the first UMB. When it looses
- >that, the whole thing is gone as far as DOS knows. Naturally
- >the blocks remain there set up correctly and device drivers
- >still work correctly with pointers being bueno all around.
-
- >I suggest someone at Microsoft run DOS apps with debugging
- >set to the memory location of the UMB pointer...
-
- Turns out that my problem was caused by the Hellween virus.
- (Bloody custommers comming in with infected machines :-))
-
-
- >Aki.
- >--
- >/ Phone: 408-662 9664 Fax: 662 9676 | 586 is a 586 no matter what \
- >\ 125 Searidge Ct #D, Aptos, CA 95003 | Intel seez. "Pent... WHAT?" /
- --
- Erik van Linstee | Delft University of Technology | I'll be back ...
- ----
- We are god, 'cause only we can create the idea of his existence
- in our holy brains... (Yello)
-