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MCQ Practice Question

Microprocessors & Microcontrollers 8085 I/O Interfacing

The 8085 has separate IN and OUT instructions with an 8-bit port address, allowing how many directly selectable I/O port addresses in isolated I/O space?

A16
B64
C256
D65536

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Correct Answer: C. 256

Explanation: An 8-bit I/O port address provides 2^8=256 possible port addresses for isolated I/O operations.

Reference: Standard microprocessors and microcontrollers: 8085 i/o interfacing

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