Need help with INT 25/ INT 26

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1 total messages Started by Unmesh Agarwala Tue, 13 Oct 1992 00:28

#1077

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

17 lines
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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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