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The assembly language is also known as a low-level programming language. The assembly language is disappearing quickly. However, it still has wide-ranging educational uses. Students are required to complete a variety of assignments on topics of assembly language. These assembly language commands require a difficult level of coding, and students can sometimes get confused. If you are one of those students who come under such conditions, then come to Sample Assignment. Here, we will offer  Assembly language assignment help  with programming solutions and have solved many assembly language assignments for students around the world. The professional  assignment help of our assembly language specialists ensures the highest possible score for the students.

how assembly language works

Key Concepts Of Assembly Language

Assembly language is a program design language used to write low-level programs and is the most direct sign of the specific machine code for each computer architecture understandable by a programmer. Our assembly language homework experts say even today it is used in the programming of handlers or manipulators of hardware devices.

Syntax Of An Assembler Source Module:

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* Instructions: these are symbolic representations of the CPU instruction set.

[Label] Instruction_name [operand (1)] [comment]

The instruction is specified on a single line and the fields are separated from each other by blanks or tabs.

* Label: symbolic identifier given to the instruction. It can be up to 31 characters long; the first non-numeric; It does not matter to use upper or lower case. The assembler interprets the labels as memory addresses. The last character is ":".

* Instruction_name: two to six letters and instruction will be transformed into a single machine code instruction.

* Operand (s): specify the data that will be processed by the instruction. There can be 0, 1, or 2 operands. If we have two, the first the "destination" and the second "source". They will be separated by a comma. There are three types: immediate, register, and memory. And also, you can modify the memory operands with the segment prefixes.

* Comment: anything that begins with ";".

* Directives (pseudo instructions): they are parts of the source file that tell the assembler how to interpret instructions or data; they are only used at assembly time; they are not translated into machine code.

[Name] directive_name [operands] [comment]

Basic assembly language instructions

The syntax is as follows

Instruction name Operand 1, Operand 2, Operand 3, Operand 4...

The name of the instruction is made up of 2 or 3 letters, the operands can be registers, constants, or memory addresses. The number of operands will depend on the instruction.

EXAMPLE:

MOV AL, [1000]

This instruction indicates that the value of the portion of memory that is in location 1000 (in hexadecimal) be copied to the bottom of the AX (AL) register. When an operand is a value of a memory address, this address is written in brackets, remember that operand 1 is the destination and operand 2 is the source. And when it is a constant will depend on the assembler, in the case of debugging (a program used to create and edit applications that comes with DOS) they will be interpreted as hexadecimal, in the following examples, it will be interpreted that the constants are hexadecimal numbers.

You can also take a value from memory pointed to by a register, for example:

MOV AL, [DI]

DI is pointed to the value in memory that will be copied to the AL register. The name MOV comes from the word move, which is an English word that means to move. Precisely the mentioned instruction means move the value pointed to by DI to AL.

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You can also copy the value from one register to another

MOV AL, BL

In this case, the value from BL is copied to AL

You can also copy the value from the lower part of a register to the upper part of another register

MOV CH, DL

As well as operating with the upper parts

MOV AH, DH

You can even copy the value of a register to a memory address

MOV [1000], AL

Also pointed the memory address to DI

MOV [DI], AL

And also with the complete registers (Only complete in the 8086 processor)

MOV AX, DX

Also, work with full registers for all 32-bit processors

MOV EBX, EDX

In this case, move the entire DX register to the entire BX register, in this case, we are working with the registers in an extended form (32 bits), but we must be careful since the 8086 processor will not correctly interpret this instruction (The 8086 processor is obsolete due to this disadvantage and others, for example, it can only address 1 MB), furthermore the debug cannot interpret this instruction.

The following cannot be done because values cannot be passed into memory without the intervention of a register, and the size has not been specified

MOV [1000], [2000]

Likewise, the following cannot be done:

MOV [DI], [1000]

As well as the following

MOV [DI], [SI]

However, the following is correct

MOV [1000], AX

But not the following because the size is not being specified.

MOV [SI], 1F

The correct thing would be the following:

If you want to transfer a byte - MOV byte [SI], 1F

If you want to transfer a word (16 bits) - MOV word [SI], 1F

If you want to transfer a double word (32 bits) - MOV dword [SI], 1F

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assembly language assembly question

assembly language assembly question sample

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