Addressing Modes Quiz1028

What is the role of the index register (IX) in the Indexed addressing mode?

• It holds the address of the operand

• It is added to the operand address

• It holds the value to be used

• It is subtracted from the operand address

Which addressing mode uses an operand that is an address holding another address?

• Immediate

• Direct

• Indirect

• Indexed

There are two types of assembler: single pass assemblers and two pass

assemblers.

Groups:

(a) Pass 1

,

(b) Pass 2

• Allocate a memory address for the line of code.

• Read the assembly language program one line at a time.

• Place address of labelled instruction in the symbol table.

• Read the assembly language program one line at a time

• » Save or execute the program.

• Check the opcode is in the instruction set.

• Ignore anything not required, such as comments.

• Add any new labels to the symbol table with the address, if known.

• Generate objec code

Make the correct classification

• The instruction uses an address calculated by adding an index to a base address.

• Direct addressing

• The instruction directly accesses the memory location specified.

• Immediate addressing

• The operand value is directly used in the operation.

• Indirect addressing

• The instruction fetches the value from a memory location pointed to by another memory location.

• Indexed addressing

• Relative addressing

• the memory address used is the current memory address added to the operand.

In which addressing mode is the operand directly specified in the instruction itself?

• Immediate

• Direct

• Indirect

• Indexed

Which addressing mode uses a base address and an offset to calculate the effective address?

• Immediate

• Direct

• Indirect

• Indexed

What is the primary advantage of using the Indirect addressing mode?

• Faster access to data

• Reduced instruction size

• Ability to access a large range of addresses

• Simplified instruction set

Identify the categories of operations in the table.

a

b

c

d

e

f

g

h

i

IN 104

ADD 89

LDI 9

Compare Instructions

JMP 90

JNZ 100

STO 56

LDD #4

OUT

"What type of instruction does LDD 100 belong to?

"What type of instruction does ADD 203 belong to?"