CS401-Midterm
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_________ is one of the reasons due to which string instructions are used in 8088
2 / 50
In 8088 architecture, whenever an element is pushed on the stack
3 / 50
The iAPX888 architecture consists of _______ register.
4 / 50
After the execution of REP instruction CX will be decremented then which of the following flags will be affected?
5 / 50
If we want to divide a signed number by 2, this operation can better be accomplished by
6 / 50
Which is the unidirectional bus ?
Control Bus
(II) Data Bus
(III) Address Bus
7 / 50
After the execution of MOVS instruction which of the following registers are updated
8 / 50
The maximum parameters a subroutine can receive (with the help of registers) are
9 / 50
The basic function of SCAS instruction is to
10 / 50
One screen location corresponds to a
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After the execution of instruction “RET”
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Code Segment is associated to _______ register by default.
13 / 50
The physical address of the stack is obtained by
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The second byte in the word designated for screen location holds
15 / 50
After the execution of STOSW the CX will be
16 / 50
The execution of the instruction “mov word [ES: 0], 0x0741” will print “A” on the screen, color of the character will be
17 / 50
Which bit of the attributes byte represents the blue component of background color ?
18 / 50
In the word designated for one screen location, the higher address contains
19 / 50
To transfer control back the RET instruction take
20 / 50
When two 16bit numbers are added the answer can be 17 bits long, this extra bit that won’t fit in the target register is placed in the where it can be used and tested
21 / 50
Which mathematical operation is dominant during the execution of SCAS instruction
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When a very large number is divided by very small number so that the quotient is larger than the space provided, this is called
23 / 50
After the execution of “PUSH AX” statement
24 / 50
In the Rotate Right Operation every bit moves one position to right and the bit dropped from the right is inserted at the left and:
25 / 50
In assembly the CX register is used normally as a ______________register.
26 / 50
To convert any digit to its ASCII representation
27 / 50
decrements SP (the stack pointer) by two and then transfers a word from the source operand to the top of stack
28 / 50
The execution of the instruction “mov word [ES: DI], 0x0720”
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The execution of the instruction “mov word [ES : 0], 0x0741” will print character “A” on screen , background color of the screen will be
30 / 50
After the execution of SAR instruction:
31 / 50
Left-Shift-Operation the left most bit _______
32 / 50
In a video memory, each screen location corresponds to
33 / 50
34 / 50
In STOS instruction, the implied source will always be in
35 / 50
“mov byte [num1],5” is _______ instruction.
36 / 50
37 / 50
All the addressing mechanisms in iAPX88 return a number called _____________ address.
38 / 50
RETF will pop the offset in the
39 / 50
In STOSB instruction, when DF is Set, SI is
40 / 50
41 / 50
In string manipulation whenever an instruction needs a memory source, which of the following will hold the pointer to it?
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43 / 50
Which bit of the attributes byte represents the red component of background color ?
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45 / 50
In the instruction “CMP AX,BX” the contents of
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47 / 50
| 0 |--›| 1 | 1 | 0 | 1 | 0 | 0 | 0 | --›| C | is a example of ______
48 / 50
An offset alone is not complete without
49 / 50
Which of the following options contain the set of instructions to open a window to the video memory?
50 / 50
_______ register holds the address of next instruction is to be executed
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