Which interrupt in 8085 Microprocessor is unmaskable?
(A) RST 5.5
(B) RST 7.5
(C) TRAP
(D) Both (a) and (b)


Answer: (C)

Explanation: There are 5 interrupt signals in 8085 Microprocessor: TRAP, RST 7.5, RST 6.5, RST 5.5, and INTR.
Maskable Interrupts: we can disable these interrupt by writing some instructions into the program. For example: RST7.5, RST6.5, RST5.5.
Unmaskable Interrupts: we cannot disable these interrupt by writing some instructions into the program. For example: TRAP.
So, option (C) is correct.

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