Vu All Subjects Assignment Quiz GDB Handouts Available here
Dear students,
Quiz-3 will be launched on August 23, 2022 that will remain open till August 25, 2022 11:59 PM The syllabus for the quiz is Lecture No. 23-32.
Note: Quizzes are generated automatically and cannot be rescheduled. Students are advised to attempt the quiz at their earliest.
In this post we are providing you CS401 Quiz-3 Solution Fall 2022 (23 to 32) 100% correct or right solution.
1. There are ________ forms of MOVS instruction.
Two…..confirm
2. The program segment prefix for com files is of ________ size.
256 bytes
3. Which of the following instructions, selects the memory address space?
Mov …..confirm
4. Which of the following instructions, selects the peripheral address space?
IN…..confirm
5. Which of the following instructions to read and write from the peripheral address space?
IN and OUT……confirm
6. INT instruction takes a ________ byte(s) argument varying from 0-255.
Single(1)…..confirm
7. Which of the following interrupt requests (IRQ) is derived by the keyboard when generates an interrupts when a key is pressed or released.
IRQ 1….confirm
8. Which of the following interrupt requests (IRQ) is the cascading interrupt connected to the output of the second 8451 in the machine?
IRQ 2….confirm
9. Which of the following interrupt requests (IRQ) is connected to serial port COM 2?
IRQ 3…..confirm
10. Which of the following interrupt requests (IRQ) is connected to serial port COM 1?
IRQ 4….confirm
11. Which of the following interrupt requests (IRQ) is used by the sound card or network card.
IRQ 5……confirm
12. Which of the following interrupt requests (IRQ) is used by the floppy disk drive ?
IRQ 6….confirm
13. Which of the following interrupt requests (IRQ) is used by the parallel port?
IRQ 7 …..confirm
14. ___________ register is used for storing the base and limit of GDT.
GDTR…..confirm
15. The first entry of the GDT must always be zero. It is called the _____.
Null descriptor….confirm
16. In intel 8088 there are a total of ________ possible interrupt vectors in an interrupt Vector Table.
256….confirm
17. Which register is generally used to specify the service number of an interrupt?
Ax…..confirm from net
18. In the context of video services, if we want to write string then which of the value will be placed in AH?
13h….confirm
19. In 9pin DB 9 connector, which pin is assigned to Signal Ground?
5….confirm
20. In 9pin DB 9 connector, which pin is assigned to Data terminal?
4….confirm
21. In 9pin DB 9 connector, which pin is assigned to transmitted data?
3…..confirm
22. In 9pin DB 9 connector, which pin is assigned to Received data?
2…..confirm
23. In 9pin DB 9 connector, which pin is assigned to Carrier Detect?
1…..confirm
24. In 9pin DB 9 connector, which pin is assigned to Data Set?
6……confirm
25. In 9pin DB 9 connector, which pin is assigned to request to send (RTS)?
7…..confirm
26. In 9pin DB 9 connector, which pin is assigned to Clear to send (CTS)?
8…..confirm
27. In 9pin DB 9 connector, which pin is assigned to Ring indicator(RI)?
9……confirm
28. The first parallel port LPT1 has ports designated from ______ to _______.
378 to 37 A…..confirm
29. A parallel port has ________ views
2…..confirm
30. COM2 is connected with
IRQ3….confirm
31. Which of the following service of INT 21 is used to write a string on standard output?
09h…..confirm
32. Which of the following register hold the page number for using the write string service of INT 10?
BH….confirm
33. New devices are allowed to work with the existing operating system with the help of ____________.
Device drivers…confirm
34. Which of the following register hold the cursor start and options for using the write string service of INT 10?
CH……confirm
35. Which of the following register hold the number of lines by which to scroll up for using the write string service of INT 10?
AL….confirm
36. Which of the following register hold the character to display for using the write string service of INT 10?
AL…..confirm
37. Which of the following register hold write mode for using the write string service of INT 10?
AL…confirm
38. The ______ and DPL have the same meaning as in data and code descriptors.
P……confirm
39. The routine which executes as a result of INT instruction is called _______.
Interrupt service routine…..confirm
40. To declare a character in assembly language, we store its ASCII code in a _____________.
Byte….confirm
41. When two devices in a system want to use the same interrupt request (IRQ) line, is referred as IRQ ______.
Conflict….confirm
42. During multitasking ________ is used to get control from the program without letting the program know about it.
IRQ 0….confirm
43. Which of the following is BIOS interrupt providing keyboard services?
INT 0x16…..confirm
44. REPNZ repeats the following instruction while the _________.
ZF is not set….confirm
45. Which of the following is the source register in OUT instruction?
AL or AX….confirm
46. At the end of servicing an interrupt _______ signal is used to inform the Programmable interrupt Controller (PIC) about it.
EOI…confirm
47. INT 0x13 service 0x03 is used to ________.
Write disk sector…confirm
48. INT 0x13 service 0x00 is used to ________.
RESET disk system….confirm
49. INT 0x13 service 0x02 is used to ________.
READ sector into memory
50. INT 0x13 service 0x08 is used to_______.
GET drive parameters….confirm
51. INT 0x21 service 0x01 is used to _________.
READ character from standard input, with echo…..confirm
52. INT 0x21 service 0x09 is used to ___________.
Write string to standard output…confirm
53. INT 0x21 service 0x0A is used to _______.
Buffered input….confirm
54. In programmable interrupt Controller (PIC) which of the following ports is used to selectively enable or disable interrupts?
21….confirm
55. In multitasking, which of the following interrupts is used scheduler?
INT 08….confirm
56. Which of the following interrupts is used for saving and restoring the registers?
INT 08….confirm
57. Scrolling is the process of moving one or more lines towards the top or bottom of the screen and this is _______.
Cleared…..confirm
58. Software interrupts are called by extended _________ call mechanism
Far
59. The root directory of floppy contains ____________ fixed entries
512….confirm
60. Programmable interrupt controller has __________ ports.
Two(20, 21)…confirm
61. The space where all registers of a task are stored is called __________.
Process control block(PCB)…….confirm
62. In the context of video services, if we want to scroll the window up which of the following will be the value of AH?
AH=06h….confirm
63. In the context of video services, if we want to scroll the window down which of the following will be the value of AH?
AH=07h….confirm
64. In the context of video services, if we want to set text-mode cursor shape which of the following will be the value of AH?
AH=01h….confirm
65. In the context of video services, if we want to set cursor position which of the following will be the value of AH?
AH=02h….confirm
66. In the context of video services, if we want to write character and attribute at cursor position which of the following will be the value of AH?
AH=09h….confirm
67. In the context of video services, if we want to write character only at cursor position which of the following will be the value of AH?
AH=0Ah….confirm
68. In the context of video services, if we want to write string which of the following will be the value of AH?
AH=13h….confirm
69. INT instruction takes a ____ byte(s) argument varying from 0-255.
1….confirm
70. Which of the following is the number of pin(s) outside the processor for generating interrupts by the external hardware?
1…..confirm
71. Each entry of the interrupt vector table is of ______ byte(s).
4….confirm
72. Which of the following is the priority of interrupt request (IRQ) 0?
Highest…confirm
73. The interrupt call loads new values in CS, IP and _______.
FLAgS….confirm
74. REP allows the instruction to be repeated _____ times.
CX …confirm
75. Which of the following interrupt Requests (IRQ) is derived by a timer device?
IRQ 0 …..confirm
76. An END of interrupt (EOI) signal is sent by the__________
Programmable interrupt controller…..confirm
77. Which of the following INT21 service is used to read character from standard input?
AH= 01h…..confirm
78. Which of the following INT21 service is used to write string to standard output?
AH=09h…..confirm
79. Which of the following INT21 service is used to buffered Input?
AH=0Ah….confirm
80. Which of the following instructions, select the peripheral address space?
IN…..confirm
81. Software interrupts are called by extended ________ call mechanism
Far….confirm
82. Which of the following is the interrupt number for debug interrupt?
Int 3…..confirm
83. In intel 8088, the interrupt vector table occupies ___________ of memory
4 bytes….confirm
84. The register size of 386 architecture is _________.
32 bit…..confirm
85. Which of the following instructions is used to disable all interrupts during the execution of a program?
cli…..confirm
86. In case of COM file, first command line parameter is stored at ______ offset of program segment prefix?
0x80….confirm
87. _________ is a special type of interrupt that returns to the same instruction instead of the next instruction.
Divide overflow interrupt…..confirm
88. Which of the following is the order of pushing the contents on stack during the execution of INT instruction?
CS, IP and flags…..confirm
89. The output of Programmable interval Timer (PIT) is connected to the ____ line of programmable interrupt controller (PIC).
IRQ 0….confirm
90. Which of the following formulae is used for calculating the segment address of an interrupt service routine “n”?
N*4+2……confirm
91. The thread registration code initializes the Process Control Block (PCB) and adds it to the linked list. The ____, then gives it a return.
Scheduler…..confirm
92. Interrupts are ___________ and _______________
Asynchronous , inpredictable…..confirm
93. The execution of the instruction mov word {ES:160} 0x1230 will print a character on screen at the ____________ column of the __________ row.
First, second….confirm
94. Which of the following formulae calculates the desired location on the screen?
Location = (rowno * 80 + column) * 2
95. The clear screen operation initializes the whole block of video memory to ________.
0x0720……confirm
96. In programmable interrupt controller, which of the following ports is the control port?
Port 20….confirm
97. The convention to return a value from a subroutine is to use the ______ register.
AX…..confirm
98. The parallel port connector is called ______
DB-25……confirm
99. Which of the following is the number of pin(s) outside the processor for generating interrupts by the external hardware?
1……confirm
100. Which of the following is the time interval between two timer ticks?
55ms……confirm
101. Which of the following IRQs is used for sound card or network card ?
IRQ 5……confirm
102. __________ is used for exporting keyboard services.
INT 11….confirm
103. If the _______ flag is set, then after every instruction, a type 1 interrupt will be generated automatically.
Trap….confirm
104. On executing INT 0x21 service 0x3D, if file is successfully opened then
ZF will contain 0….confirm from net
105. On executing INT 0x21 service 0x3D, if file can’t be opened then
ZF will contain 1….confirm from net
106. BPB stands for________.
Bios parameter block……confirm
107. Which of the following is the destination register in IN instruction?
AL or AX….confirm
108. Interrupts are _______ events
Synchronous
109. The correlation process from the interrupt number to the interrupt handler uses a table called __________.
Interrupt vector table….confirm
110. Which of the following services of INT 10 is used to get the video font information?
1130h….confirm
111. In case of COM file, maximum length of parameters passes through command line can be __________.
255 bytes
112. Programmable interrupt Controller (PIC) has ___________ input signal(s) and __________ output signal(s).
Eight, one….confirm
113. Which of the following is used to clear the direction flag?
Cld…..confirm
114. Which of the following is used to set direction flag?
Std……confirm
115. Which of the following is the ACK pin in DB-25 connector?
10…..confirm
116. BIOS video services are broadly classified into ______ categories.
2……confirm
117. In multitasking environment, which of the following structure is used to maintain the order of active process control blocks (PCB)?
Register…..confirm
118. _________ is a special instruction that loads a general purpose register, and a segment register from two consecutive memory locations.
LES…..confirm
119. Programmable interrupt Controller (PIC) has __________ input signal(s) and _____ output signal(s).
Eight, one….confirm
120. Which of the following interrupts plays the most significant part during single step debugging of a program?
INT 1…..confirm
121. Iret returns on the basis of _________ and ______.
Cs,IP…..confrim
122. Total number of reserved interrupts in Intel 8088 are
255…..confirm
123. The 8088 processor divides interrupts into _________ classes.
Two…confirm
124. As compared to ________, _________ provides more cooked services.
BIOS, DOS…..confirm
125. The IDTR is a __________ bit register similar in structure to the GDTR
48……confirm
126. INT13-BIOS disk services generally uses which register to return the error flag?
CF…..confirm
127. DOS has a single entry point to access all of its services through __________.
INT 21…..confirm
128. Which of the following flags can be used in mathematical operations?
Carry flag….confirm
129. What is the purpose of the following two instructions? MOV AX, 0XB800 MOV EX,AX
POINTS ES to video base……confirm
130. Which of the following instruction is used to return from an interrupt service routine?
Iret….confrim
131. Which of the following pins of DB-25 connector are ground?
18-25…..confirm
132. INT13-BIOS disk services generally uses which register to return the error code?
AH…..confirm
133. IBM AT has _______ Programmable interrupt Controllers (PIC)
2….confirm
134. WHICH OF the following interrupts is used to maintain the system time?
INT 8…..confirm
135. Which of the following flags is cleared with the help of stack?
Direction flag…..confirm
136. The register size of 386 architecture is __________.
32 bit…..confirm
137. After the execution of STOSB and STOSW the CX register will be ________ by ________.
Decremented by 1……confirm
138. Which of the following is the highest priority interrupt?
INT 08……confirm
139. There is an auto-increment mode when the _______ is __________.
DF, set……confirm
140. Which of the following services of INT 10 is used for writing the string?
0x13…..confrim
141. Changing and restoring the state of Central Processing Unit (CPU) is called.
Multitasking
142. Which of the following stands for TSR?
Terminate and stay resident….confirm
143. After the execution of STOSB and STOSW, the CX register will be _______ by _________.
Decremented by 1….confirm
144. While writing graphics pixel on the screen, which registers hold the value for setting cursor position?
CX, DX…confirm from net
145. Which of the following BIOS INT provides serial port services.
INT 14……confirm
146. Which of the following stands for TSR?
Terminate and stay resident…..confirm
147. PCB stands for ____________.
Process control block….confirm
148. The bits are sent one by one in a specially formatted fashion on the ___________.
Serial port…confirm
149. In assembly language _______ is used to load a character in AL.
Lodsb……confirm
150. Which of the following services of INT 10 is used to write graphic pixel on the screen?
0x0C…..confirm
151. COM1 is accessible via ports _______ while COM2 is accessible via _______.
358-3FF, 258-2FF……confirm
152. Port ____ is used to send an END of interrupt (EOI) signal to the programmable interrupt Controller (PIC) after an interrupt has ended.
0x20…..confirm
153. __________ is a special prefix that is used to repeat the block instructions.
REP….confirm
154. COM1 is connected with
IRQ4….confirm
155. BIOS video services are exported via interrupt.
INT 10…..confirm
156. In the context of video services, if we want to set the cursor at top left corner, which of the values will be stored in DH and DL respectively?
00.00…….confirm
157. REPE repeats a string instruction while the ______ flag is set.
Zero…confirm
158. Device drivers can be divided into ________ major categories.
2……confirm
159. A 32-bit address register can access up to ___ of memory
4GB….confirm
160. _____ is used in debugging along with the trap flag.
INT 1…..confirm
161. Push and pop operations always operate on __________.
Words…..confirm
162. Which of the following instructions is used to read a character from the keyboard port?
In al, 0x60……confirm
163. REP with MOVS utilizes the _____ power of a processor to do scrolling in minimum time.
Full….confirm
164. The programmable interval timer (PIT) has input frequency of _______.
1.19318 MHZ…..confirm
Which of the following is used to terminate a string in assembly language?
$
Which of the following registers are
used as a DOS input buffer?
DS:DX
BIOS video services are exported via
interrupt
INT10
In interrupt masking, We use
________ to get control from the program without letting the program know about
it.
IRQ 0
In case of COM file, maximum length
of parameters passed through command line can be ___
255 bytes
In case of COM file, first command line
parameter is stored at ___ offset of 'program segment prefix'
0x80
In multitasking, which of the
following interrupts is used as scheduler during context switching?
INT 8
____________ is the highest priority
interrupt in interrupt controller.
IRQ 0
Which of the following INT 21
service is used to read character from standard input?
01
As compared to _________ , ___________
provides more cooked services.
BIOS, DOS
In 9pin DB 9 connector, which pin is
assigned to TD (Transmitted Data) ?
3
Hard disk MBR (Master Boot Record)
is of size
446 bytes
In the context of video services, if
we want to set the cursor at top left corner, which of the values will be
stored in DH and DL respectively?
00, 00
Which of the following service of
INT 21 is used to write a string on standard output?
09h
While using INT 10 for writing
graphic pixel on screen, which of the following registers hold the information
about pixel color?
AL
BIOS video services are broadly
classified into ________ categories.
2
INT 0x13 service 0x03 is used to
_________.
Write disk sector
Which of the following services of
INT 10 is used for writing the string?
0x13
The root directory of floppy
contains _____ fixed entries.
512
"INT13 --BIOS disk
services" generally uses which register to return the 'error flag' ?
AH
In the context of video services, if
we want to scroll the window up which of the following will be the value of AH?
AH = 06h
In multitasking environment, which
of the following structure is used to maintain the ordering of active PCBs ?
Linked List
We can set the current file position
in DOS using service number ____
0x42
Which of the following registers hold
the page number for using the write string service of INT 10?
BH
In 9pin DB 9 connector, which pin is
assigned to CD (Carrier Detect) ?
1
In 9pin DB 9 connector, which pin is
assigned to RD (Received Data) ?
2
In 9pin DB 9 connector, which pin is
assigned to TD (Transmitted Data) ?
3
In 9pin DB 9 connector, which pin is
assigned to DTR (Data Terminal Ready)?
4
In 9pin DB 9 connector, which pin is
assigned to SG (Signal Ground) ?
5 Page163
9pin DB 9 connector which pin is
assigned to DSR (Data Set Ready) ?
6 Page163
In 9pin DB 9 connector, which pin is
assigned to RTS (Request to Send) ?
7
In 9pin DB 9 connector, which pin is
assigned to CTS (Clear to Send) ?
8
In 9pin DB 9 connector, which pin is
assigned to RI (Ring Indicator) ?
9
The 'program segment prefix' for com
files is of size:
256 bytes
Which of the following BIOS INT
provides serial port services
INT 14
The first sector on hard disk
contains the
Bytes per sector
In the context of video services, if
we want to set cursor position which of the following will be the value of AH?
AH = 02h
A 32-bit address register can access
up to ____ of memory.
4 GB
In the context of video services, if
we want to write string then which of the value will be placed in AH?
13h
A FAT32 file system directory entry
in DOS consist of how many bytes ?
32
_________ byte of DOS data buffer
stores the maximum characters buffer can hold.
First
The maximum length of DOS command
line parameters is
512 bits
On executing INT 0x21 service 0x3D,
if file is successfully opened then
ZF will contain 0
COM1 is connected with
IRQ4
COM2 is connected with
IRQ3
Which of the following services of
INT 10 is used to get the video font information?
1130h
Which of the following services of
INT 10 is used text mode charge?
1110h
BPB stands for
Bios Parameter Block
Device drivers can be divided into
___ major categories:
2
On executing INT 0x21--service 0x3D,
if file can't be opened then
ZF will contain 1
Which of the following services of
INT 10 is used to write graphic pixel on the screen ?
0Ch
Each thread can have their own
Stack
Threads can have function calls,
parameters and __________ variables.
Local
Which of the following is the
highest priority interrupt
INT8
Changing and restoring the state of
Central Processing Unit (CPU) is referred as:
Multitasking
TSR stands for:
Terminate and Stay Resident
Which of the following IRQs is
derived by a keyboard?
IRQ 1
Which of the following IRQs is
connected to serial port COM 2?
IRQ3
Programmable interrupt controller
(PIC) has
Eight input signals and one output
signals
Which of the following IRQs is used
by the parallel port?
IRQ
Which of the following IRQs is a cascading
interrupt?
IRQ 2
Which of the following pins of a
parallel port connector are grounded
18-25
Which of the following IRQs is used
for Floppy disk derive?
IRQ 6
When two devices in the system want
to use the same IRQ line then what will happen?
An IRQ Conflict
The parallel port connector is
called ?
DB-25
IRQ is referred to
Eight input signals
Which of the following are required
for thread entry?
CS and IP
In programmable interrupt controller
which of the following ports is used for selectively enabling or disabling
interrupts
21
Programmable interrupt controller
has two ports 20 and 21. Port 20 is the control port while port 21
is...........
The Interrupt mask registers
Which of the following interrupts is
used for Arithmetic overflow?
INT 4
DOS has a single entry point through
------- just like a pin hole camera
INT 21
There are ________ forms of MOVS
instruction.
Two
The program segment prefix for com
files is of ________ size.
256 Bytes
Which of the following interrupt requests
(IRQ) is derived by the keyboard when generates an interrupt when a key is
pressed or released?
IRQ 1
Which of the following interrupt
requests (IRQ) is the cascading interrupt connected to the output of the second
8451 in the machine?
IRQ 2
Which of the following interrupt
requests (IRQ) is connected to serial port COM 2?
IRQ 3
Which of the following interrupt
requests (IRQ) is used by the sound card or network card?
IRQ 5
Which of the following interrupt
requests (IRQ) is used by the floppy disk drive?
IRQ 6
Which of the following interrupt
requests (IRQ) is used by the parallel port?
IRQ 7
___________ register r is used for
storing the base and limit of GDT.
GDTR
The first entry of the GDT must
always be zero. It is called the _____.
Null descriptor
Which register is generally used to
specify the service number of an interrupt?
Ax
The first parallel port LPT1 has ports
designated from ______ to _______.
378 to 37 A
A parallel port has ________ views
2
New devices are allowed to work with
the existing operating system with the help of ____________.
Device drivers
Which of the following register hold
the cursor start and options for using the write string service of INT 10?
CH
Which of the following register hold
the number of lines by which to scroll up for using the write string service of
INT 10?
AL
The ______ and DPL have the same
meaning as in data and code descriptors.
P
The routine which executes as a result
of INT instruction is called _______.
Interrupt service routine
To declare a character in assembly
language, we store its ASCII code in a _____________.
Byte
When two devices in a system want to
use the same interrupt request (IRQ) line, is referred as IRQ ______.
Conflict
Serial port services are provided by
the __________.
BIOS INT 14
Which of the following is BIOS
interrupt providing keyboard services?
INT 0x16
Which of the following is the source
register in OUT instruction?
AL or AX
At the end of servicing an interrupt
_______ signal is used to inform the Programmable interrupt Controller (PIC)
about it.
EOL
INT 0x13 service 0x00 is used to
________.
RESET disk system
INT 0x13 service 0x02 is used to
________.
READ sector into memory
INT 0x13 service 0x08 is used
to_______.
GET drive parameters
INT 0x21 service 0x01 is used to
_________.
READ character from standard input,
with echo
INT 0x21 service 0x09 is used to
___________.
Write string to standard output
INT 0x21 service 0x0A is used to
_______.
Buffered input
Scrolling is the process of moving one
or more lines towards the top or bottom of the screen and this is _______.
Cleared
Software interrupts are called by
extended _________call mechanism.
Far
The space where all registers of a
task are stored is called __________.
Process control block (PCB)
In the context of video services, if
we want to scroll the window down which of the following will be the value of
AH?
AH=07h
In the context of video services, if
we want to set text-mode cursor shape which of the following will be the value
of AH?
AH=01h
Each entry of the interrupt vector
table is of ______ byte(s).
4
Which of the following is the
priority of interrupt request (IRQ) 0?
Highest
The interrupt call loads new values
in CS, IP and _______.
FLAgS
REP allows the instruction to be
repeated _____ times.
CX
Which of the following interrupt
Requests (IRQ) is derived by a timer device?
IRQ 0
In intel 8088, the interrupt vector
table occupies ___________ of memory
4 bytes
The register size of 386
architecture is _________.
32 bit
Which of the following instructions
is used to disable all interrupts during the execution of a program?
Cli
In case of COM file, first command
line parameter is stored at ______ offset of program segment prefix?
0x80
_________ is a special type of interrupt
that returns to the same instruction instead of the next instruction.
Divide overflow interrupt
The output of Programmable interval Timer
(PIT) is connected to the ____ line of programmable interrupt controller (PIC).
IRQ 0
Which of the following formulae is used
for calculating the segment address of an interrupt service routine “n”?
N*4+2
The thread registration code
initializes the Process Control Block (PCB) and adds it to the linked list. The
____, then gives it a return.
Scheduler
Interrupts are ___________ and
_______________
Asynchronous, unpredictable
The execution of the instruction mov
word {ES:160} 0x1230 will print a character on screen at the ________ column of
the _______ row.
First, second
Which of the following formulae
calculates the desired location on the screen?
Location = (rowno * 80 + column) * 2
The clear screen operation
initializes the whole block of video memory to ________.
0x0720
In programmable interrupt
controller, which of the following ports is the control port?
Port 20
The convention to return a value
from a subroutine is to use the ______ register.
AX
Which of the following is the time
interval between two timer ticks?
55ms
__________ is used for exporting
keyboard services.
INT 16
If the _______ flag is set, then
after every instruction, a type 1 interrupt will be generated automatically.
Trap
Which of the following is the interrupt
number for nON-maskable interrupt (NMI)?
INT 2
Which of the following is used to
clear the direction flag?
Cld
Which of the following is used to
set direction flag?
Std
Which of the following is the ACK
pin in DB-25 connector?
10
The IDTR is a __________ bit
register similar in structure to the GDTR
48
INT13-BIOS disk services generally
use which register to return the error flag?
CF
DOS has a single-entry point to access
all of its services through __________.
INT 21
Which of the following instruction
is used to return from an interrupt service routine?
Ire
WHICH OF the following interrupts is
used to maintain the system time?
INT 8
Which of the following flags is
cleared with the help of stack?
Direction flag
After the execution of STOSB and
STOSW the CX register will be ________ by ________.
Decremented by 1
There is an auto-increment mode when
the _______ is __________.
DF, set
COM1 is accessible via ports _______
while COM2 is accessible via _______.
358-3FF,258-2FF
BIOS video services are exported via
interrupt.
INT 10
REPE repeats a string instruction
while the ______ flag is set.
Zero
_____ is used in debugging along
with the trap flag.
INT 1
Push and pop operations always
operate on __________.
Words
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