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Article #319Finding hardware bios and ram in the dos upper 384k region.
From: Tom Swanson
Date: Tue, 15 Sep 1992 19:27
Date: Tue, 15 Sep 1992 19:27
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1524 bytes
Hi, I have a problem. I need to know how to locate bios and adapters in the dos upper memory region. I know that I can look for the hex string 55AA which denotes the start of bios code followed by the size, in 512 byte chunks, of the bios code. That seems to work. My first question is -- will this always find every occurance of a bios? Looking at the output of asq by Quantalis (sp?) there are areas of RAM on some adapter boards sitting in this upper memory region. How does one go about locating this region? I presume that is would be very bad to simply see if I can write and read out there. Who knows what it would do to my peripherals. My last question (although if anyone with experience in this knows of anything that I am likely to miss in this area let me know) is how do I know which regions of memory (between A0000 and C0000) are ACTUALLY used by my video card? I prefer an email answer to toms@digibd.com, but I'll take the info where I can get it. Thanks, TomS I suppose I should have a signature here.
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Newsgroups: alt.msdos.programmer Path: arc1-ca.pugleaf.net!sparky!uunet!digibd!toms From: toms@digibd.com (Tom Swanson) Subject: Finding hardware bios and ram in the dos upper 384k region. Organization: DigiBoard Incorporated, Eden Prairie, MN Date: Tue, 15 Sep 1992 19:27:12 GMT Message-ID: <1992Sep15.192712.20270@digibd.com> Summary: I need to know how to locate the open spaces in upper memory. Keywords: upper memory, bios Sender: toms@digibd.com Lines: 30