Types of Addressing

Question 1

Immediate addressing

Answer 1

The operand is the actual value to be operated on. for example 3 or 75.

Question 2

Direct Addressing

Answer 2

The operand holds the memory address of the value to be operated on. This is what is used in LMC.

Question 3

Indirect Addressing

Answer 3

The operand is the location (typically a register) which holds the address of the data we want. This enables a larger range of addressable locations.

Question 4

Indexed Addressing

Answer 4

The address of the operand is optained by adding to the contents of a general register (called the index register) a constant value. The number of the index register, and the constant value are included in the instruction code.
Used to access an array whose elements are in successive memory locations.