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Yashika • 3.75K Points
Extraordinary Computer

Q. How many interrupt control lines are there in 8085 microprocessor

  • (A) 6
  • (B) 8
  • (C) 10
  • (D) 16
  • Correct Answer - Option(A)
  • Views: 178
  • Filed under category Computer
Explanation by: Mr. Dubey

The 8085 microprocessor has 6 interrupt control lines used to handle interrupts.

These are:

  1. TRAP – Non-maskable, highest priority interrupt
  2. RST7.5 – Maskable, vectored interrupt
  3. RST6.5 – Maskable, vectored interrupt
  4. RST5.5 – Maskable, vectored interrupt
  5. INTR – Maskable, non-vectored interrupt
  6. INTA – Interrupt acknowledge (not an interrupt request, but used in the interrupt process)

Summary:

  • 5 are interrupt request lines.
  • 1 is interrupt acknowledge.
  • So, total = 6 interrupt control lines.

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