Question

The number of hardware interrupts that the processor 8085 consists of is

(a) 1

(b) 3

(c) 5

(d) 7

I had been asked this question in class test.

I need to ask this question from Programmable Interrupt Controller 8259A topic in section Special Purpose Programmable Peripheral devices and their Interfacing of Microprocessor

Answer 1

Correct choice is (c) 5

For explanation: The processor 8085 has five hardware interrupt pins. Out of these five, four pins were alloted fixed vector addresses but the pin INTR was not alloted by vector address, rather an external device was supposed to hand over the type of the interrupt to the microprocessor.