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1 LAB 3 question
Computer Organization (Universiti Teknologi MARA)
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CSC 159 / MARCH 2019
NAME
SAFINA AKILAH BINTI MOHAMMAD SABRI
MATRIC NO.
2018212834
SUBJECT
CSC159
GROUP
CS1102D
LECTURER’S
NAME
MADAM NORMALINA
LAB ASSIGNMENT 3
DUE DATE:
23 MAY 2019
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lOMoARcPSD|12084276
CSC 159 / MARCH 2019
LAB 2
For questions no 1 to no 3, trace the program and show the contents of registers and
memory (if related) after each instruction is executed.
1.
mov
mov
shr
rcl
shl
al, 0fch
cl, 4
al, cl
al,2
al, 1
SECTION A
SECTION B
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lOMoARcPSD|12084276
CSC 159 / MARCH 2019
2.
mov
mov
sar
sal
rol
ax,
cl,
ax,
al,
al,
-4
2
cl
1
2
SECTION A
SECTION B
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lOMoARcPSD|12084276
CSC 159 / MARCH 2019
3.
total dw 6000
mov cl, 3
rcr total, cl
shr total, 1
mov ax,total
rol al, 1
SECTION A
SECTION B
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lOMoARcPSD|12084276
CSC 159 / MARCH 2019
4.
Why are these instructions error?
shr 4, 1
ror 4, ax
mov al, 256
mov AL, 25
mov cl, 256
shr al, cl
4 is the destination
Destination cannot be an immediate data
Only source can be an immediate value,a register or a
memory operand
Only immediate data or CL can be used as second
parameter
256 is more than 8 bits
Second operand is more than 8 bits
Second operand is more than 8 bits
5.
In SIX (6) lines of instruction, convert this equation into
Assembly
Language programme.
TOTAL=( 7∗12 )∧38
Answer:
total dw ?
mov ax,7
mov bx,12
mul bx
and ax,38
mov total,ax
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