Which among the following are non maskable type of interrupt in 8085?

Which among the following are non maskable type of interrupt in 8085?

a. RST 5.5
b. INTR 8085
c. Both a & b
d. TRAP

Correct Answer : d. TRAP

Explanation :

TRAP is a non-maskable type of an interrupt since it does not depend upon EI & DI while RST family & INTR 8085 represent maskability as they are being controlled by EI & DI.