Discussion
The interrupts in 8085 processor are
I. RST 6.5
II. RST 5.5
III. TRAP
IV. RST 0
Keep the sequence from least priority to highest priority.
Answer: C
From least to highest priority the sequence is IV, II, I, III, option (C). In the 8085, the maskable hardware interrupts rank as INTR, which is lowest, then RST 5.5, RST 6.5 and RST 7.5, and TRAP, which is the non-maskable one, has the highest priority. RST 0 is not one of the hardware interrupt pins; it is a restart instruction that is supplied through the INTR line, so it ranks lowest. So the order is RST 0, RST 5.5, RST 6.5, TRAP. Options (A) and (D) put TRAP at the bottom. Option (B) puts RST 6.5 below RST 5.5, which reverses their priority.
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