CSC208: FOUNDATION OF SEQUENTIAL PROGRAMMING
CSC208: FOUNDATION OF SEQUENTIAL PROGRAMMING
(FUO, 2ND
SEMESTER 2018/2019 SESSION)
INSTRUCTION: ANSWER QUESTION ONE AND ANY
OTHER TWO.
1. QUESTION ONE
a. Draw a
detailed diagram of an Intel 8086 processor. Describe the control and
Arithmetic and logic units.
b. Q1b
i.
List two functions of the Intel processor
ii.
What are registers?
iii.
Describe the following registers in the processor;
Memory Data Register (MDR), Memory Buffer Register (MBR), Memory Address
Register (MAR).
c. Q1c
i.
State how the processor uses the address bus, the data
bus, and the control bus to communicate with the system memory?
ii.
What are the specific features of the accumulator,
index registers, program counter and program status word?
d. Convert the
following appropriately
i.
11100100110001112 to Hexa-decimal
ii.
2A5FB16 to Binary
iii.
7148 to Binary
iv.
11011101112 to Decimal
v.
14738 to Decimal
e. Study the
following Assembly language program and
answer the questions that follow
Segment .testing
Global main
main:
mov bx, 0 ;
mov ax, 0 ;
LX: add ax[num1+bx] ;
add bx, 2 ;
cmp bx, 20 ;
jne LX ;
mov [sum], ax ;
mov ax, 0x4c00 ;
int 0x21 ;
num1: dw 14, 73, 19, 76, 71, 72, 70, 10, 55, 30,
50, 20, 15, 99, 48;
sum: dw 0 ;
i.
List the following identifiers in the program; data
label, code label, system call, arithmetic instruction, branching instruction,
data transfer and comments.
ii.
State the command line for assembling this code if you
saved it using your first name as the source program name
iii.
What will be the output of the program after
execution?
2. QUESTION TWO
a. What is
NASM? Explain the effect of the following assembly language command line: nasm MyFirstProgram.asm –o
MyFirstProgram.com –1 MyFirstProgram.lst
b. What is an
addressing mode? Explain with examples the following Intel 8086 addressing
modes
i.
Direct addressing
ii.
Base register indirect
iii.
Indexed register + offset
iv.
Base + Index + Offset
c. List the
flags defined in the 8086 FLAGS register. Describe the function of the zero
flag, the carry flag, the sign flag and the overflow flag.
3. QUESTION THREE
a. Define the
following terms
i.
Algorithm
ii.
Pseudocode
iii.
Compiler
iv.
Interpreter
v.
Assembler
b. Describe
the following assembly language directives; RESB, INCBIN, EQU, DB, DD, DW and
TIMES.
c. Provide the
value of the zero flag, the carry flag, the sign flag and the overflow flag
after each of the following instruction is executed if ax = FAFA and bx = CAFÉ?
i.
add ax, 1254
ii.
add ax, bx
iii.
add bx, C15B
4. QUESTION FOUR
a. List the
seven addressing modes available in the 8088 architecture and briefly describe
four of them
b. Write short
note on the two – pass assembly process for translating instructions to its
machine code.
c. What is an
effective address? What will be the effective address generated by the
following instructions if initially, the registers store the following BX =
0x0300, K1 = 0x3001, [K1] = 0x0000 and SI = 0x0300.
i.
mov AX, [BX + SI]
ii.
mov AX, [BX + K1]
iii.
mov AX, [K1 + BX]
iv.
mov AX, [BX + 15]
5. QUESTION FIVE
a. Define
i.
HLL
ii.
LLL
iii.
Little endian
iv.
Big endian
v.
Machine language
b. Describe the
following Assembly language instructions:
i.
ADDC A, R4
ii.
SUBB A, #58d
iii.
INC R8
iv.
MUL AB
v.
ANL A, #67h
c. State the
meaning and effect of the following branching instructions on the status FLAG;
i.
JNAE
ii.
JE
iii.
JG
iv.
JNP
v.
JNC.
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