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Which interrupt is unmaskable?

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Which interrupt is unmaskable?

(a) RST 5.5

(b) RST 7.5

(c) TRAP

(d) Both RST 5.5 and 7.5

I got this question in quiz.

I need to ask this question from Interrupts topic in portion Input/Output Organisation of Computer Architecture

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Correct option is (c) TRAP

The best I can explain: The trap is a non-maskable interrupt as it deals with the ongoing process in the processor. The trap is initiated by the process being executed due to lack of data required for its completion. Hence trap is unmaskable.

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