How to login to NOUN Elearn Portal
You can now use you matric number to login as your username and password in a lowercase.
https://elearn.nouedu2.net/login/
Note that you are to change your passw...
NATIONAL OPEN UNIVERSITY OF NIGERIA
UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
MARCH/APRIL 2015 EXAMINATION
COURSE CODE: CIT 344
COURSE TITLE: Introduction to Computer Design
DURATION: 3 Hours
INSTRUCTIONS: Answer any Five (5) Questions
1a. Give a brief explanation of how sequential circuits are implemented, using a well-labelled block diagram to illustrate this. 8 marks
1b. Distinguish between the two (2) common types of sequential circuits 6 marks
[Total = 14 marks]
2a. Find the sum of two 2-digit BCD numbers, 42 and 31. Your result should be in BCD. 8 marks
2b. specify the procedure required to save a program that is already stored on memory in Assembly Language 8 marks
[Total = 14 marks]
3. Go through the table below and answer the questions that follow:
|
Input |
Output |
|
|
S |
R |
Qt + 1 |
|
0 |
0 |
Invalid |
|
0 |
1 |
1 |
|
1 |
0 |
0 |
|
1 |
1 |
Qt |
3a. Specify what this depicts. 4 marks
3b. Write the full-meaning S-R in the context of NAND-based latches 4 marks
3c. Give the value of the output Q, when S = 0, R = 1 6 marks
[Total = 14 marks]
4. Microprocessors normally execute programs which include operating systems and user application. List and describe the internal components of a typical microprocessor. [Total = 14 marks]
5a. Name the four (4) forms of notations that can be used to capture the behaviour of
finite-state machines 4 marks
5b. Write short notes on the following:
- Memory Read Operation 4 marks
- Data Signals 3 marks
- Read/Write signals 3 marks
6a. If gbx contains 1000h and esi contains 5, specify the function of the following instruction: mov al, 8[gbx][esi*5] 5 marks
6b. Write the standard format for assembly language statements in a typical source file. 6 marks
6c. Name each of the fields in the statements you have provided. 4 marks
[Total = 14 marks]
7a. List and describe the three main forms of flash memory operations. 12 marks
7b. Write down the instruction required to move data from one segment of a register ‘ecx’ to another ‘edx’. 2 marks
[Total = 14 marks]
