Computer Organization And Architecture MCQ - I/O Interface

1 The 8085 microprocessor responds to the presence of an interrupt

A
As soon as the TRAP pin becomes 'LOW'
B
By checking the TRAP pin for 'high' status at the end of each instruction fetch
C
By checking the TRAP pin for 'high' status at the end of the execution of each instruction
D
By Checking the TRAP pin for 'high' status at regular intervals

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Correct AnswerOption C

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2 CPU has two modes privileged and non-privileged.In order to change the mode from privileged to non-privileged

A
A hardware interrupt is needed
B
A software interrupt is needed
C
Either (a) or (b)
D
A non-privileged instruction (which does not generate an interrupt) is needed

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Correct AnswerOption B

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A software interrupt is initiated by some program module which need some CPU services, at that time the two modes can be interchanged. Hence (B) is correct option.

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3 The TRAP interrupt mechanism of the 8085 microprocessor executes