What is DUP in Assembly?

What is DUP in Assembly?

The DUP directive tells the assembler to duplicate an expression a given number of times. For example, 4 DUP(2) is equivalent to 2, 2, 2, 2.

What is a directive in assembly language?

Directives are instructions used by the assembler to help automate the assembly process and to improve program readability. Examples of common assembler directives are ORG (origin), EQU (equate), and DS. B (define space for a byte). Directives are used essentially in a pre-processing stage of the assembly process.

Which directive is used to reserve duplicate locations in memory?

DD directive

What is stack and stack directive in Al?

STACK directive. The operating system initializes ESP to the address of the first byte above the 4096 bytes in the stack. A larger or smaller stack could be allocated, depending on the anticipated usage in the program.

What is the difference between a directive and command?

As nouns the difference between directive and command is that directive is an instruction or guideline that indicates how to perform an action or reach a goal while command is an order, a compelling task given to an inferior or a machine.

What is the difference between an instruction and a directive?

An instruction is directly translated to something the CPU can execute. A directive is something the assembler can interpret, and tells something about the way the instructions are to be assembled.

Why do we use 6 byte queue in 8086?

Hence the instruction queue is 6 bytes so that it can accommodate the longest instruction. longest instructions can be possible upto 6 bytes hence instructions queue has size of 6 bytes in 8086 and queue will be filled when it has 2 bytes empty because 8086 has 16 bit data bus so it can fill queue in one cycle.

What is directive teaching?

Directive teaching is the application of be- havioral analysis techniques to find answers and solutions to problems in education. Directive teachers are as concerned about children, lessons, classroom management, and schools as other teachers who may espouse dif- ferent philosophies or approaches.

What is the purpose of the proto directive?

What is the purpose of the PROTO directive? The PROTO directive is the keyword that is written on the right hand side of the procedure name to be declared by the assembler. (True/False): A link library is added to a program just before producing an Executable file.

Is A5h a valid hexadecimal constant?

h, q, o, d, b, r, t, y. Is A5h a valid hexadecimal constant? Real number constant: +3.5E-02.

Which directive ends a procedure?

ENDP directive

Which data directive creates a 32 bit signed integer variable?

data directive SDWORD

What is the largest signed integer that may be stored in 32 bits?

The number 2,147,483,647 (or hexadecimal 7FFFFFFF16) is the maximum positive value for a 32-bit signed binary integer in computing.

How do you create a 32-bit signed integer variable?

The XDR standard defines signed integers as integer. A signed integer is a 32-bit datum that encodes an integer in the range [-2147483648 to 2147483647]. An unsigned integer is a 32-bit datum that encodes a nonnegative integer in the range [0 to 4294967295].

Which directive is used when defining unsigned 32-bit integers?

SDWORD directive

What is the largest decimal value you can represent using an 86 bit signed integer?

2^85 – 1

Which directive is used to assemble the code?

Assembler directives

Which of the following is the correct syntax for calling a macro?

Which of the following is the correct syntax for calling a Macro? Explanation: While calling a Macro, we need not mention the assembler directive: MACRO. Also, the parameter’s list is optional to pass.

Which assembler directive is used to indicate the beginning of the address?

Explanation: The directive SEGMENT indicates the beginning of the segment.

What does EQU mean in assembly?

register-relative value

What are assembler directives in 8086?

Assembler Directives of 8086. It provides information to the assembler regarding the name of the program or data segment for that particular segment. This directive specifies that the instruction of the source program is stored in logical segment _DONE.

Why are assembler directives required?

The assembler directives control organization of the program and provide necessary information to the assembler to understand assembly language programs to generate machine codes. They indicate how an operand or a section of program is to be processed by the assembler.

Which assembler directive indicates that the end of the source program?

ASSUME- The directive is used for telling the assembler the name of the logical segment which should be used. END- This is placed at the end of a source and it acts as the last statement of a program. This is because the END directive terminates the entire program.

Which are advanced assembler directives?

Assembler Directives

  • = Assigns a value to a symbol (same as EQU)
  • EQU. Assigns a value to a symbol (same as =)
  • ORG. Sets the current origin to a new value.
  • DS. Defines an amount of free space.
  • ID. Sets the PIC’s identification bytes.
  • INCLUDE. Loads another source file during assembly.
  • FUSES.
  • IF

What directives indicate the start and end of a procedure?

The PROC and ENDP directives mark the beginning and end of a procedure.

What are functions performed in pass 1 by a two pass assembler?

A simple Two-Pass Assembler Main Functions

  • Translate mnemonic operation codes to their machine language equivalents.
  • Assign machine addresses to symbolic labels used by the programmers.

Why we use ORG 0100h in 8086 programming?

ORG means origin ORG is used for specific addressing in microprocessor and microcontroller programming. This means we want to start our program from the 0000H address. its the location in memory where you want the binary program to be loaded to, if any.

What is the use of Origin advanced assembler directive?

Origin : The origin directive tells the assembler where to load instructions and data into memory. The 68000 reserves the first 1024 bytes of memory for exception vectors. Your programs will start at location 1024; that is, you should begin your program with ORG 1024 or ORG $400 (remember that 1024 = 40016).

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