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Study Stuff for MCA Examinations - NIMCET
Study Stuff for MCA Examinations - NIMCET
Previous Year Question (PYQs)
Regarding the subroutines, see the following sequence of tasks to be performed:
A. Turn on the interrupt facility.
B. Service the device whose flag is set.
C. Save the contents of processor registers.
D. Check which flag is set.
E. Restore the contents of processor registers.
Solution
Interrupt Service Routine (ISR) steps:
Save processor registers → C
Check which device raised interrupt → D
Service the device → B
Restore processor registers → E
Re-enable interrupt facility → A
Correct sequence:
C, D, B, E, A
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