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In: Computers and Technology

Submitted By sammyosan
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1. (12 points) Show how the value ASCII “DEVORA” is stored as hexadecimal in memory in Big Endian format starting at location 200 hexadecimal. Assume that each memory location stores two ASCII characters.

|Memory Location |Value Stored |
| | |
| | |
| | |

2. (18 points) ) For X = 0011 1111, show the result of the following independent operations (i.e. each instruction occurs with X starting at the value above):

a) Shift-right ____ ____

b) Circular Shift-right ____ ____

c) Shift-left ____ ____

d) Circular Shift-left ____ ____

e) Arithmetic Shift-left ____ ____

f) Arithmetic Shift-right ____ ____

3. (12 points) a) Convert the following formula from postfix (Reverse Polish Notation) to infix: AB*CD/+

b) Convert the following formula from infix to postfix (Reverse Polish Notation): A + B * C + D / E * F

Note that the result of part b) can be used in problem 7
In the problems 4 through 7 write code that performs the computation: X = A + B * C + D / E * F

using CPUs that have the following instruction formats. You may only use registers A through F, plus X and T. Registers A through F may not be changed, i.e. their values are fixed. Register T may be used as a temporary register, and Register X must contain the final answer.

4. (12 points) Three-operand instructions

5. (12 points) Two-operand instructions

6. (12 points) One-operand instructions

7. (12 points) Stack instructions

See Self-Assessment problem 9 in Module for a similar problem.

It is important to remember that operational hierarchy dictates that: • we first perform all arithmetic inside inner parentheses (if there are any), • then inside outer parentheses (if there are any), • then do multiplication and division operations before addition and subtraction operations. 8. (16 points) A two-word instruction is stored at location 150 with its address field at location 151 (all numbers in hexadecimal). The first word of the instruction specifies the operation code and mode; the second word specifies the address part.

The values of the program counter (PC register), a general register (R1), the index register (XR), the base register (BR), and certain addresses in memory are as shown below.

Evaluate the effective address and the value that is loaded into the AC if the addressing mode of the instruction is:

| |Addressing Mode |Effective address |Value of the operand loaded into |
| | | |the AC |
|a) |Immediate | | |
|b) |Direct addressing | | |
|c) |Indirect addressing | | |
|d) |Register | | |
|e) |Register indirect | | |
|f) |Relative address | | |
|g) |Base register addressing | | |
|h) |Indexed addressing | | |

Memory Registers Address Content
|PC =150 | |150 |Load to AC; Mode |
| |151 |Address = 300 |
|R1 = 800 | |152 |Next instruction |
| |: |: |
|XR = 400 | |200 |300 |
| |: |: |
|BR = 500 | |300 |600 |
| |: |: |
|AC = ? | |452 |100 |
|: |: |
|600 |700 |
|: |: |
|700 |750 |
|: |: |
|800 |900 |
|: |: |
|900 |950 |

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