Need help with INT 25/ INT 26

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#1077

From: Unmesh Agarwala
Date: Tue, 13 Oct 1992 00:28

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I've waded through a lot of DOS programming documentation but have been
unable to come up with a solution to this programming problem.

There are two forms of parameter passing to INT 25 (Absolute Disk Read)
and its counterpart INT 26 (Absolute Disk Write).  The second, which
involves passing a pointer to a small disk packet structure, needs to
be used when, and I quote the documentation, "bit 1 of the device
attribute word in the device driver is set".

The documentation I have seen describes how the device attribute word is
created when writing a device driver; it does not say how one can 
determine the contents of this word for an installed device driver, in
my case an installable disk driver.

Any help will be greatly appreciated.

-Unmesh

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Path: arc1-ca.pugleaf.net!sparky!uunet!charon.amdahl.com!pacbell.com!sgiblab!sgigate!odin!fido!unmesh
From: unmesh@sgi.com (Unmesh Agarwala)
Newsgroups: comp.sys.ibm.pc.programmer,comp.sys.ibm.pc.misc
Subject: Need help with INT 25/ INT 26
Date: 13 Oct 1992 00:28:59 GMT
Organization: Silicon Graphics, Inc.
Lines: 18
Sender: unmesh@sgi.com
Distribution: usa
Message-ID: <1bd58bINNnke@fido.asd.sgi.com>
NNTP-Posting-Host: calvin.asd.sgi.com
Summary: How do I determine the value of the device attribute word?
Keywords: device attribute word