Question 1) In a peripheral-mapped I/O, can an input port and the output port have the same port address? Describe in detail.
Question 2) Write down the control signals that are essential in the memory-mapped I/O?
Question 3) Name the four categories of 8085 instructions which manipulate data.
Question 4) Explain opcode and operand, and state the opcode and the operand in the instruction MOV H, L.
Question 5) Write down logical steps to add following two Hex numbers. Both the numbers must be saved for future use. Store the sum in an accumulator. Numbers: A2H and 18H.
Question 6) State the contents of registers and flag status as the following instructions are executed.
i) MVI A, 00H
ii) MVI B, F8H
iii) MOV C, A
iv) MOV D, B
v) HLT
Question 7) Write down instructions to load hexadecimal number 65H in register C and 92H in accumulator A. Show the number 65H at PORT0 and 92H at PORT1.
Question 8) Draw and describe the block diagram of a microprocessor 8085.
Question 9) Why the lower order address bus is multiplexed with data bus? How they will be de-multiplexed?
Question 10) Distinguish between maskable and non-maskable interrupts.
Question 11) Write down 8085 assembly language program using minimum number of instructions to add 16 bit no. in BC, DE & HL. Save the 16 bit result in DE pair.