4.2 Assembly Language Cambridge iAS 9618

What is the relationship between assembly language and machine code?

• Assembly language provides a human-readable version of machine code instructions

• Assembly language is a higher-level programming language that does not correspond to machine code

• Assembly language is more efficient than machine code for execution

• Machine code is a high-level abstraction of assembly language

What is the first stage of a two-pass assembler process?

• The first pass scans the source code, creating a symbol table and generating machine code with placeholders

• The first pass translates the source code into executable binary

• The first pass compiles the source code into assembly language

• The first pass writes the output program to memory

In the second pass of a two-pass assembler, what is done?

• The symbol table is used to replace placeholders with actual addresses, and the final machine code is generated

• The program is debugged and errors are fixed

• The machine code is translated into assembly code

• The program is executed and tested

What is the purpose of tracing an assembly program?

• To step through the program’s execution and observe the changes in registers and memory

• To debug the program by finding syntax errors

• To convert assembly code into machine code

• To compile the program for execution

Which of the following is NOT a category of instructions in assembly language?

• Memory management

• Data movement

• Arithmetic operations

• Input and output of data

What does an immediate addressing mode refer to?

• The operand is a constant value directly specified in the instruction

• The operand refers to a memory address

• The operand is the value stored at the memory location specified by the instruction

• The operand is a computed value based on an index

What is direct addressing mode?

• The operand is the actual memory address

• The operand is a constant value embedded in the instruction

• The operand is calculated using an index value

• The operand is indirectly referenced by another address

How does indirect addressing work?

• The operand is a memory address that contains another address pointing to the actual data

• The operand is a fixed value that does not change

• The operand is a register storing the value directly

• The operand is directly specified in the instruction

What does indexed addressing mode involve?

• The operand is determined by adding a constant index to a base address

• The operand is a direct memory address without any modification

• The operand is determined by a fixed offset

• The operand is an immediate value

What is relative addressing mode used for?

• The operand is calculated by adding an offset to the current instruction pointer

• The operand directly points to a specific memory address

• The operand refers to the current value in the Accumulator (ACC)

• The operand is the value stored in an index register