Question

While executing the PUSH*A instruction, the stack pointer is decremented by

(a) 1 bit

(b) 2 bits

(c) 4 bits

(d) 16 bits

I had been asked this question in a national level competition.

This question is from Instruction Set Features -1 topic in section 80286-80287-A Microprocessor with Memory Management and Protection of Microprocessor

Answer 1

Right choice is (b) 2 bits

To explain I would say: The stack pointer is decremented by 16 (eight 2-byte registers).