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Doctors Medicines MCQs Q&A

  1. P uses TRAP, Q uses RST 5.5 and R uses RST 6.5
  2. P uses RST 5.5, Q uses RST 6.5 and R uses RST 7.5
  3. P uses RST 7.5, Q uses RST 6.5 and R uses RST 5.5
  4. P uses RST 5.5, Q uses RST 6.5 and R uses TRAP
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1 Answers

Option 3 : P uses RST 7.5, Q uses RST 6.5 and R uses RST 5.5

The priority of interrupts in the decreasing order:

TRAP > RST 7.5 > RST 6.5 > RST 5.5

Given that, device P has the highest priority and device R has the lowest priority.

From the options, P uses RST 7.5, Q uses RST 6.5 and R uses RST 5.5.

:

Interrupt

Priority

Trigger

Mask

Vector

Vectored address

Instruction

TRAP (RST 4.5)

1 (Highest)

Edge and Level

Non-maskable

Vectored

0024 H

Independent of EI and DI

RST 7.5

2

Edge

Maskable

Vectored

003C H

Controlled by EI and DI Unmasked by SIM

RST 6.5

3

Level

Maskable

Vectored

0034 H

Controlled by EI and DI Unmasked by SIM

RST 5.5

4

Level

Maskable

Vectored

002C H

Controlled by EI and DI Unmasked by SIM

INTR

5 (Lowest)

Level

Maskable

Non-Vectored

0000 to 0038 H

Controlled by EI and DI
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