Loading instructions, Basic Computer Science

Assignment Help:
They are particular register instructions. They are used to load bytes or sequences of bytes onto a register.
LODS (LODSB) (LODSW)
LAHF
LDS
LEA
LES
LODS (LODSB) (LODSW) INSTRUCTION
Goal: To load sequences of a byte or a word into the accumulator.
Syntax:
LODS
This instruction takes the sequence found on the address specified by SI, loads it to the AL (or AX) register and adds or subtracts , depending on the state of DF, to SI if it is a bytes transfer or if it is a words transfer.
MOV SI, OFFSET VAR1
LODS
The first line loads the VAR1 address on SI and the second line receives the content of that locality to the AL register.
• The LODSB and LODSW commands are used likewise, the first one loads a byte and the second one a word (it uses the whole AX register).
LAHF INSTRUCTION
Goal: It transfers the full content of the flags to the AH register.
Syntax:
LAHF
This instruction is helpful to make sure the state of the flags through the execution of our program.
LDS INSTRUCTION
Goal: used to load the register of the data segment
Syntax:
LDS destiny, source
The source operator must be a dual word in memory. The word related with the largest address is transferred to DS, in other words it is taken as the segment address. The word associated with the lesser address is the displacement address and it is deposited in the register indicated as destiny.
LEA INSTRUCTION
Goal: To load the address of the source operator
Syntax:
LEA destiny, source
The source operator must be situated in memory, and its displacement is placed on the index register or specified pointer in destiny.

Related Discussions:- Loading instructions

Specify the steps to creating a powerpoint presentation, FUNDAMENTALS OF CO...

FUNDAMENTALS OF COMPUTERS 1. Describe the importance of video in multimedia. What are some of the tips to keep in mind while making video for the web? 2. Specify the steps t

Algorithms and flowcharts, 1. Write an algorithm and draw a flowchart to ac...

1. Write an algorithm and draw a flowchart to accept the names and gross salary of 5000 employees and to generate the net pay. If the gross salary is greater than N 50,000 declare

Types of search engine, Types of Search Engine:   Some of the basic ca...

Types of Search Engine:   Some of the basic categories of Search engines are :  a. Primary Search Engines: Such search engines use web crawlers or spiders to traverse the w

What is mixing, Question 1 Briefly explain waveform Characteristics ...

Question 1 Briefly explain waveform Characteristics Question 2 Write a note on: types of Microphones Question 3 Briefly explain Magnetic Properties of Audiotape

C++, how to use expressions in c++ program with examble

how to use expressions in c++ program with examble

Star topology, Ask conceptual question answer about star topology#Minimum 1...

Ask conceptual question answer about star topology#Minimum 100 words accepted#

Electronic mail , Electronic mail is another PC to PC and PC to mainframe ...

Electronic mail is another PC to PC and PC to mainframe data exchange. If you subscribe to an electronic mail service, it will enable your PC to gain access to a 'mailbox' on a ma

Advantages of computerized record-keeping, Advantages of Computerized Reco...

Advantages of Computerized Record-keeping Less manpower is required for upkeep.  Recording, storing, and retrieving are all much faster: easier and with little practice

Python Identifiers, A Python identifier is a name used for classify a funct...

A Python identifier is a name used for classify a function, variable, class, module or any other object. An identifier begins with a letter A to Z or a to z or an underscore (_) fo

., why first generation computers are better than fourth generation compute...

why first generation computers are better than fourth generation computers

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