Question

Statement I: I/O devices can be accessed using IN and OUT instructions.

Statement II: Arithmetic and logic operations can be directly performed with I/O data.

Code:

1. Both Statement I and Statement II are individually true and Statement II is the correct explanation of Statement I
2. Both Statements I and Statement II are individually true but Statement II is mot the correct explanation of Statement I
3. Statement I is true but Statement II is false
4. Statement I is false but Statement II is true

Answer 1

Correct Answer - Option 4 : Statement I is false but Statement II is true

Statement I: False

• In memory-mapped I/O, devices cannot be accessed using IN and OUT instructions
• IN and OUT both are 2-byte instructions in 8085 processor

 

Example:

IN – port address DB (Hexadecimal)

OUT-port address D3 (Hexadecimal)

So statement 1 is False

Statement II: True

In memory-mapped I/O, arithmetic and logic operations can be directly performed with the I/O data.