Question

Develop a circuit that places interrupt type number 86H on the data bus in response to the INTR input.

Answer 1

As shown in the circuit diagram, when clock takes transition from LOW to HIGH, triggers an interrupt (INTR) to the processor. In response to an INTR request, the processor complete the current instruction execution, saves all necessary data on stack / memory / register, resolves the interrupt priority if multiple interrupt request pending and issues interrupt acknowledge signal usually represented as active low INTA.

Active Low INTA clears the interrupt request and asserts external hardware to load an appropriate interrupt type number and initiates corresponding interrupt request.