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Final exam – computer organization and architecture

1.      Convert the following expression in postfix (reverse Polish notation). Remember the rules of precedence for arithmetic operators. To get full credit, you need to show all work done. i.e. sample snapshot of the stack

X = A – B + C * (D * E – F) / (G + H * K)

2.       Show how the following values would be stored by machines with 32-bit words, using little endian and big endian format. Assume each value starts at address 016. Draw a diagram of memory for each, placing the appropriate values in the correct (and labeled) memory locations.

a. 0123456816

b. 0000112216


3.       Write code to implement the expression: A= (B+C) * (D+E) on 3-, 2-, 1- and 0- address machines. In accordance with programming language practice, computing the expression should not change the values of its operands. Show all instructions.

4.       A digital computer has a memory unit with 32 bits per word. The instruction set consists of 128 different operations. All instructions have an operations code part (opcode) and an address part (allowing for only one address). Each instruction is stored in one word of memory.

a. How many bits are needed for the opcode?

b. How many Bits are left for the address part of the instruction?

c. What is the maximum allowable size for memory?

5.       Write the following code segment in MARIE’s assembly language:

if X > 1 then
           Y = X + X;
           X = 0;
            Y = Y + 1;

6.       Write a MARIE subroutine to subtract two numbers.



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