CS401-Midterm
1 / 50
In STOS instruction, the implied source will always be in
2 / 50
Which bit of the attributes byte represents the red component of background color ?
3 / 50
_______ register holds the address of next instruction is to be executed
4 / 50
In string manipulation whenever an instruction needs a memory source, which of the following will hold the pointer to it?
5 / 50
The iAPX888 architecture consists of _______ register.
6 / 50
All the addressing mechanisms in iAPX88 return a number called _____________ address.
7 / 50
The first instruction of “COM” file must be at offset:
8 / 50
In STOSB instruction, when DF is Set, SI is
9 / 50
Stack is a ______ that behaves in a first in last out manner.
10 / 50
physical address of the stack is obtained by
11 / 50
The iAPX88 processor supports ___________ modes of memory access.
12 / 50
When an item is pushed on the decrementing stack, the top of the stack is
13 / 50
The routine that executes in response to an INT instruction is called
14 / 50
“mov byte [num1], 5” is _________ instruction.
15 / 50
All the addressing mechanisms iniAPX88 return a number called ______ address.
16 / 50
Assembly language is:
17 / 50
The execution of the instruction “mov word [ES: 0], 0x0741” will print “A” on the screen, color of the character will be
18 / 50
When a 16 bit number is divided by an 8 bit number, the dividend will be in
19 / 50
Execution of the instruction “mov word [ES : 0], 0x0741” will print
20 / 50
If we want to divide a signed number by 2, this operation can better be accomplished by
21 / 50
After the execution of “PUSH AX” statement
22 / 50
Which is the unidirectional bus ?
Control Bus
(II) Data Bus
(III) Address Bus
23 / 50
MOV instruction transfers a byte or word from which of the following source location.
24 / 50
In the instruction “CMP AX,BX” the contents of
25 / 50
While using STOBS, if DF=1 then
26 / 50
27 / 50
Which bit of the attributes byte represents the blue component of background color ?
28 / 50
29 / 50
In the word designated for one screen location, the higher address contains
30 / 50
The execution of the instruction “mov word [ES : 160], 0x1230” will print a character “0” on the screen at
31 / 50
In assembly the CX register is used normally as a ______________register.
32 / 50
The instruction ADC has________ Operand(s)
33 / 50
Which mathematical operation is dominant during the execution of SCAS instruction
34 / 50
35 / 50
REP will always
36 / 50
Code Segment is associated to _______ register by default.
37 / 50
The basic function of SCAS instruction is to
38 / 50
Left-Shift-Operation the left most bit _______
39 / 50
40 / 50
In a video memory, each screen location corresponds to
41 / 50
42 / 50
43 / 50
After the execution of instruction “RET ”
44 / 50
8088 is a 16bit processor with its accumulator and all registers of __________.
45 / 50
To transfer control back the RET instruction take
46 / 50
After the execution of MOVS instruction which of the following registers are updated
47 / 50
The prevalent convention in most high level languages is stack clearing by the
48 / 50
_________ is one of the reasons due to which string instructions are used in 8088
49 / 50
After the execution of STOSW the CX will be
50 / 50
The extended ASCII has
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