Question

The highest priority usage than any other usage is

(a) transfer with LOCK (active low) signal

(b) hold request

(c) processor extension data transfer

(d) data transfer performed by EU (execution unit)

I had been asked this question in final exam.

This key question 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

Answer 1

Correct choice is (a) transfer with LOCK (active low) signal

To explain: The transfer with LOCK (active low) signal is the highest priority usage than any other usage.