Define strategy procedure, Computer Engineering

Assignment Help:

Q. Define Strategy Procedure?

The strategy procedure is called when loaded into memory by DOS or whenever controlled device request service. The major purpose of the strategy is to save request header and its address for use by interrupt procedure.

The request header is used by DOS to communicate commands and other information to interrupt procedure in the device driver.

The request header comprises length of the request header as its first byte. This is essentialsince the length of request header differs from command to command. The return status word communicate information back to DOS from device driver.

The initialise driver command (00H) is always executed when DOS initialises device driver. Initialisation commands pass message to video display indicating that driver is loaded into system and returns to DOS the amount of memory required by the driver. You can only use DOS INT 21H functions 00H.


Related Discussions:- Define strategy procedure

What are the steps in executing the program, What are the steps in executin...

What are the steps in executing the program? 1.Fetch 2.Decode 3.Execute 4.Store

Write a short note on mmx technology, Write a short note on MMX technology....

Write a short note on MMX technology. MMX (Multimedia extensions) technology adds 57 new instructions to instruction set of the Pentium - 4 microprocessors. MMX technology also

What are the necessary elements of an e-banking site, What are the necessar...

What are the necessary elements of an e-banking site? E-banking systems rely upon a number of common elements or processes. The given list comprises many of the potential elem

Explain the hamiltonian path, What is Hamiltonian path?  A Hamiltonian ...

What is Hamiltonian path?  A Hamiltonian path in a directed graph G is a directed path that goes by each node exactly once. We consider a special case of this difficulty where

Path & Path Production, Take the following flow graph and use the procedure...

Take the following flow graph and use the procedure in chapter 8 to derive an equivalent regular expression. Show all intermediate graphs (to ensure that you follow the procedure,

What is common language runtime, What is "Common Language Runtime" (CLR)?  ...

What is "Common Language Runtime" (CLR)?  CLR is .NET equivalent of Java Virtual Machine (JVM). It is the runtime that changes a MSIL code into the host machine language code,

What are different types of log records, What are different types of Log re...

What are different types of Log records? V1 and V2.  V1 must be processed before V2.  But, we can have more than single V2 logs

Differences between a database index and a match code, What are the differe...

What are the differences between a Database index and a match code? Match code can have fields from several tables whereas an index can have fields from only one table.

Propositional inference rules, Propositional Inference Rules: Proposit...

Propositional Inference Rules: Propositional Inference Rules Equivalence rules are mostly useful because of the vice-versa aspect, that means like we can search backwards and

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