Question

what is functiona of full nested mode in 8259​

Answer 1

Answer:

Fully Nested Mode of 8259 (FNM) :

In this mode, IR0 has highest priority and IR7 has lowest priority. When the interrupt is acknowledged, it sets the corresponding bit in ISR. This bit will inhibit all interrupts of the same or lower level, however it will accept higher priority interrupt requests.

Explanation:

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Answer 2

Answer:

Fully Nested Mode of 8259 (FNM) :

In this mode, IR0 has highest priority and IR7 has lowest priority. When the interrupt is acknowledged, it sets the corresponding bit in ISR. This bit will inhibit all interrupts of the same or lower level, however it will accept higher priority interrupt requests.

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