Writing down your own interrupt service routines, Computer Engineering

Assignment Help:

Q. Writing down your own Interrupt Service Routines?

Here are a few rules which should be kept in mind while writing down your own Interrupt Service Routines:

1.  Use Int 21h, function 35h to get the needed IVT entry from IVT. Save this entry for later use.

2.  Use Int 21h, function 25h to modify IVT. 

3.  If your program isn't going to stay resident then save the contents of the IVT and later restore them when your program exits.

4.  If your program is going to stay resident then use one of the terminate and stay resident functions to reserve proper amount of memory for your handler.


Related Discussions:- Writing down your own interrupt service routines

Represent negative numbers in the computer system, Q. What are the values o...

Q. What are the values of x, y, and z. (1011.001101)2 = (x)10 = (y)8 = (z)16 Q. What are the various ways to represent Negative Numbers in the Computer system?

Same reg variable in an always block, What value is inferred when multiple ...

What value is inferred when multiple procedural assignments made to the same reg variable in an always block? When  there  are  multiple  nonblocking  assignments  made  to  th

Explain three-way handshake mechanism, Explain Three-Way Handshake Mechanis...

Explain Three-Way Handshake Mechanism used by TCP to terminate a Session reliably. Just to guarantee that connection is sets up or terminated reliably, transfer control protoco

Boolean algebra, Boolean algebra. Boolean algebra mathematical method ...

Boolean algebra. Boolean algebra mathematical method based on human reasoning. In Boolean algebra only two states exist; true and false which are written as 1 (true) and 0 (fa

Explain the instruction decode, Q. Explain the Instruction Decode? Ins...

Q. Explain the Instruction Decode? Instruction Decode: This phase is performed under control of Control Unit of computer. The Control Unit determines the operation which is t

Scope of expert system, The scope of the experts system is very limite...

The scope of the experts system is very limited. It cannot work outside the field it is being used. The users knowledge is required to adjust to new situation. To reduce

Logical database structure, It is not essential to maintain the Parent-Chil...

It is not essential to maintain the Parent-Child relationship among the tables in Logical Database Structure. False. One has to handle the Parent-Child relationship.

Unlike ipv4 & ipv6 which field in base header not include, Unlike Ipv4, Ipv...

Unlike Ipv4, Ipv6 does not include which field in the base header? Unlike Ipv4, Ipv6 does not contain the Field for Fragmentation information into the base header.

Implementation of a simple arithmetic, Q. Implementation of a Simple Arithm...

Q. Implementation of a Simple Arithmetic? So, by now we have concerned how logic and arithmetic micro-operations can be applied individually. If we combine these 2 circuits alo

State the types of common toes deformities a, Common toes deformities are: ...

Common toes deformities are: 1. Hallux valgus: Deviation of great toe towards the second toe resulting in prominence of first metatarsal head.  Later on there is formation of

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd