Question

The number of hardware interrupts (which require an external signal to interrupt) present in an 8085 microprocessor are:

• A. 1
• B. 4
• C. 5
• D. 13

Hint:

The 8085 has 5 hardware interrupts: TRAP, RST7.5, RST6.5, RST5.5, and INTR. Remember this for quick recall in exam scenarios.

Answer 1

The Correct Option is C

The 8085 microprocessor supports 5 hardware interrupts, each of which requires an external signal to initiate an interrupt. These are:
- TRAP – Non-maskable and highest priority
- RST 7.5 – Maskable vectored interrupt
- RST 6.5 – Maskable vectored interrupt
- RST 5.5 – Maskable vectored interrupt
- INTR – Maskable, non-vectored interrupt
These interrupts are used for responding to critical and real-time events in hardware.
Hence, the correct number of hardware interrupts in the 8085 microprocessor is 5.