Hardware Interrupts are short code fragments that provide useful services that can be triggered by items of hardware. When a printer runs out of paper, it sends a signal to the CPU. The CPU interrupts normal processing and processes the interrupt. In this case code would run to display a "Paper Out" message on the screen. When this processing is complete, normal processing resumes.
This simulator has a timer that triggers INT 02 at regular time intervals that you can pre-set in the Configuration Tab. You must put an interrupt vector at address 02 that points to your interrupt code. Look at the example.
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