Physics · Microprocessors - 8259 Interrupt Controller
What is the primary role of the In-Service Register (ISR) in the 8259 Programmable Interrupt Controller?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1To set priorities and dynamically reset the system clock after service routines finish.
- 2To keep track of all interrupt levels that are requested but not yet acknowledged.
- 3To store the interrupt bits that have been masked by the processor.
- 4To store the interrupt level(s) that are currently being executed.✓
Correct answer
To store the interrupt level(s) that are currently being executed.
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