CS401 Computer Architecture and Assembly Language
Quiz No.2 May 02, 2012
Both DS and ES can be used to access the video memory. However we commonly keep DS for accessing our data, and load ES with the segment of video memory.
Select correct option:
True
False
PAGE 81
Question # 2 of 10 ( Start time: 03:17:23 PM ) Total Marks: 1
How many characters standard ASCII has?
Select correct option:
512
256
128
64
During the CALL operation, the current value of the instruction pointer is automatically saved on the stack, and the destination of CALL is loaded in the instruction pointer.
Select correct option:
True
False
VGA stands for
Select correct option:
Video Graphic Accumulator
Video Graphics Adapter
Visual Graphics Adapter
Video Graphics Application
Video Graphics Adapter
________ transfers the word at the current top of stack (pointed to by SP) to the destination operand and then increments SP by two to point to the new top of stack.
Select correct option:
PUSH
POP
CALL
None of the given
The execution of the instruction "mov word [ES : 160], 0x1230" will print a character on the screen at:
Select correct option:
First column of second row
Second column of first row
Second column of second row
First column of third row
The Operation of pop ax is AX <-- [SP] SP <-- SP-2
Select correct option:
True
False
_______ function decrements SP (the stack pointer) by two and then transfers a word from the source operand to the top of stack now pointed to by SP.
Select correct option:
POP
PUSH
RET
ADD
Far calls are called intra segment calls.
Select correct option:
True
False
STOS is often used to clear a block of memory or fill it with a constant.
Select correct option:
True
False
How many characters were defined by standard ASCII?
Select correct option:
132
124
122
128
Stack clearing by the caller needs an extra instruction on behalf of the caller after every call made to the subroutine, unnecessarily increasing instructions in the program.
Select correct option:
True
False
The direction of movement is controlled with the _________________in the flags register. If this flag is cleared the direction is from lower addresses towards higher addresses and if this flag is set the direction is from higher addresses to lower addresses.
Select correct option:
Direction Flag (DF)
Control Flag (CF)
Carry Flag (CF)
Non of above
ASCII stands for____________________________.
Select correct option:
American Standard Code for Information Interaction
American Standard Code for Information Interchange
American Standard Communication for Integer Interchange
American Scientific Communication for Integer Interaction
During the CALL operation, the current value of the instruction pointer is automatically saved on the stack, and the destination of CALL is loaded in the instruction pointer.
Select correct option:
Extended ASCII has 256 characters with assigned numbers from
Select correct option:
1 to 255
0 to 256
0 to 255
1 to 256
Hexadecimal is the prevalent and standard format for representation of characters in computers.
Select correct option:
True
False
The execution of the instruction "mov word [ES : 160], 0x1230" will print a character on the screen at:
Select correct option:
First column of second row
Second column of first row
Second column of second row
First column of third row
In the instruction "mov word [es:160], 0x1230", 12 means:
Select correct option:
green color on black background
green color on blue background
black color on green background
blue color on green background
This top of stack is contained in the ____ register.
Select correct option:
SP
BP
AX
BX
PUSH increments SP (the stack pointer) by two and then transfers a word from the source operand to the top of stack now pointed to by SP.
Select correct option:
True
False
Page 71
The reduction in code size and the improvement in speed are the two reasons why block processing instructions were introduced in the _____________ processor.
Select correct option:
8088
8085
8080
iAPX386
MOVS is used to ________ a block of memory.
Select correct option:
Save
Move
Delete
Push
The operation of PUSH is not similar to CALL however with a register other than the instruction pointer.
Select correct option:
True
False
Reference: operation of PUSH is similar to CALL however with
a register other than the instruction pointer. page 69
Both DS and ES can be used to access the video memory. However we commonly keep DS for accessing our data, and load ES with the segment of video memory.
Select correct option:
True
False
Which bit of the attributes byte represents the blue component of foreground color ?
Select correct option:
0
1
2
3
SCAS compares a source byte or word in register AL or AX with the ___________ string element addressed by ES: DI and updates the flags.
Source
Destination
Flag
Register
page 92
An element is pushed on the stack SP is decremented by ____ as the 8088 stack works on word sized elements.
Three
two
four
five
page 68
To access the arguments from the stack, the immediate idea that strikes is to ____ them off the stack.
push
pop
add
insert
We use _______ to access the parameters that are stay on the stack with out popping them.
pop
DS not sure
PUSH
BP
How many characters were defined by standard ASCII?
132
124
128
ASCII table is the contiguous arrangement of the uppercase alphabets (41-5A), the lowercase alphabets (61-7A), and the numbers ______________
31-40
29-39
30-39
page no 80
The purpose of MOVS instruction is to move a memory location to register
True
False
_________ decrements SP (the stack pointer) by two and then transfers a word from the source operand to the top of stack now pointed to by SP.
push
pop
call
None
This top of stack is contained in the ____ register.
SP
BP
AX
To access the arguments from the stack, the immediate idea that strikes is to ____ them off the stack.
Select correct option:
Push
Pop
Add
Insert
Parameters clears from the stack by the
Select correct option:
caller
callee
caller and callee
None of the given
There are just ____ block processing instructions in 8088.
Select correct option:
6
5
4
3
_________ decrements SP (the stack pointer) by two and then transfers a word from the source operand to the top of stack now pointed to by SP.
Select correct option:
PUSH
POP
CALL
None of the Above
The operation of PUSH is not similar to CALL however with a register other than the instruction pointer.
Select correct option:
True
False
The direction of movement is controlled with the _________________in the flags register. If this flag is cleared the direction is from lower addresses towards higher addresses and if this flag is set the direction is from higher addresses to lower addresses.
Select correct option:
Direction Flag (DF)
Control Flag (CF)
Carry Flag (CF)
Non of above
Hexadecimal is the prevalent and standard format for representation of characters in computers.
Select correct option:
True
False
MUL (multiply) Instruction performs an unsigned multiplication of the source operand and the ___________.
Select correct option:
Accumulator
Carry
Word
Base
We can convert any digit to __ by adding 0x30 in the digit.
Select correct option:
Character
ASCII
EBCDIC
Standard Code
A typical stack is an area of computer memory with a fixed origin and a variable
True
False
Local variables should be created when the subroutine is called and discarded afterwards.
True
False
Both DS and ES can be used to access the video memory. However we commonly keep DS for accessing our data, and load ES with the segment of video memory.
True
False
Elements are removed from the stack in the reverse order to the order of their addition.
True
False
The Operation of Push is if "we push ax" then SP<-- SP+2 [SP]<-- AX
True
False
The operations of placing items on the stack and removing them from there are called push and ret.
True
False
A _____ is an area of memory that holds all local variables and parameters used by any function and remembers the order in which functions are called so that function returns occur correctly.
Instruction Pointer
Stack
Data Segment
Base Register
Stack is a data structure that behaves in a first in last _______ manner.
In
Out
Push
Add
RET do not pops the word at the top of the stack (pointed to by register SP) into the instruction pointer but increments SP by two.
True
False
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