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The slave (which is selected) sends the vector on data bus after the

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in Microprocessor by (39.3k points)
The slave (which is selected) sends the vector on data bus after the

(a) first INTA (active low) pulse from 80286

(b) second INTA (active low) pulse from 80286

(c) third INTA (active low) pulse from 80286

(d) none of the mentioned

I had been asked this question in a job interview.

Query is from Priority of Bus Use By 80286, Bus Hold and HLDA Sequence, Interrupt Acknowledge Sequence in portion 80286-80287-A Microprocessor with Memory Management and Protection of Microprocessor

1 Answer

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by (49.2k points)
Correct answer is (b) second INTA (active low) pulse from 80286

The best explanation: The interrupt acknowledge sequence consists of two INTA (active low) pulses. After the second pulse, the selected slave sends the vector on D0-D7 data lines, and 80286 reads it.

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