Which MS-DOS functions get and set interrupt vectors?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Which MS-DOS functions get and set interrupt vectors?

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Which MS-DOS functions get and set interrupt vectors?

Solution:

There are two functions in MS-DOS for setting and retrieving interrupt vectors  accessible through the DOS function call INT 21h.

while calling the 25h function the AL register holds the interrupt table index and DS and DX register point to the address of the interrupt service routine. The another function is 35h which is used to get or return the value of an interrupt vector from the table.

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