CS609 Solved MCQ mega collection by Arslan Ali and

CS609 Solved MCQ Zeeshan

mega collection by
Arslan Ali and Zeeshan

w w w. v u a s s i g n m e n t s . c o m
Arslan Ali
Vuassignments.com

CS609

System Programming

12/11/2012

www.vuassignments.com Page 0
 CS609 Solved MCQ mega collection by Arslan Ali and
Zeeshan

Only ________ ports are important from programming point of view.

70 and 71H
71 and 72H

70 and 72H

72 and 73H

____whenever received indicates the start of communication and ______ whenever received indicates a
temporary pause in the communication.

XON & XOFF

XON & YOFF

YON & XOFF

There are two main types of interrupts, namely

PC based and Window based

Hardware interrupts and Software interrupts

None of the given

Standard PC operates in two modes in terms of memory which are

Real mode and Extended Mode

None of the given

Real mode and protected mode

BPB stands for _________.

BIOS parameter block

Base processing block

www.vuassignments.com Page 1
 CS609 Solved MCQ mega collection by Arslan Ali and
Zeeshan

BIOS partition block

The Function of I/O controller is to provide ____________.

I/O control signals

Error Correction and Detection

All of given

IVT is a table containing ______ byte entries each of which is a far address of an interrupt service
routine.

2
4

16

The service number is usually placed in the ________ register.

AL
CL

AH

AX

The keyboard makes use of interrupt number _______ for its input operations.

9
10

11

12

The service _________ is called the keyboard hook service.

15H/2FH
15H/4FH

15H/FFH

www.vuassignments.com Page 2
 CS609 Solved MCQ mega collection by Arslan Ali and
Zeeshan

The BIOS interrupt ________ can be used to configure RTC.

1AH
2AH

3AH

4AH

______ is Disk interrupt.

10H
11H

13H

14H

Int ________ is used to control the printer via the BIOS.

17H
18H

20H

21H

Counter register can be used to divide clock signal.

True
False

There are __________ kinds of serial communication.

2
3

________ store the base address for LPT1.

40:00H
40:02H

www.vuassignments.com Page 3
 CS609 Solved MCQ mega collection by Arslan Ali and
Zeeshan

40:08H

40:1AH

The amount of memory above conventional memory (extended memory) can be determined using the
service ___.

15H/88H
16H/88H

17H/88H

21H/88H

The output on the monitor is controlled by a controller called __________ within the PC.

Video controller
Bus controller

Ram controller

None of the given

The keyboard input character scan code is received at ___ port. 60H

61H
62H

63H

64H

At IRQ 7 Interrupt # ___ is used.

0x0A
0x0B

0x0C

0x0F

Software based flow control make use of _________control characters.Bottom of FormTop of Form

XON
XOFF

www.vuassignments.com Page 4
 CS609 Solved MCQ mega collection by Arslan Ali and
Zeeshan

Both of Given

No of Given

In _____________ each byte is needed to be encapsulated in start and end.

Synchronous Communication
Asynchronous Communication

Both of Synchronous & Asynchronous Communication

None of given

We have set the bit No. 7 of IMR(Interrupt Mask Register) to unmask the Interrupt so that interrupt
_____ can occur at ____ line.

0xf , IRQ 7
0xa, IRQ 6

0x8, IRQ 5

0x6, IRQ 2

If we want to produce the grave voice from speaker phone then we have to load the ____ divisor values at
Port ___.

high, 0x42
low, 0x22

high, 0x22

low, 0x42

The baud rate is set in accordance with the divisor value loaded within the UART internal registers base
+0 and base +1.

True
False

In keyboard status byte bit no. 2 and 3 are used for ctrl and alt keys respectively. which of the following
condition is used to check that Ctrl + Alt keys are pressed. Where: unsigned char far * scr = (unsigned
char far *)(0x00400017);

if (((*scr)&12)==12)

www.vuassignments.com Page 5
 CS609 Solved MCQ mega collection by Arslan Ali and
Zeeshan

if (((*scr)&18)==8)

if (((*scr)&14)==4)

if (((*scr)&2)==2)

______ is used to read date from RTC.

1A/02H
1A/03H

1A/04H

1A/05H

If the following function, keep(1, 1000); is called in the TSR program, it means that ________ No. of
bytes are reserved in the memory.

8000
16000

32000

64000

In order to produce the sound from PC internal Speaker we have to load the ___bit divisor value at the
___port.

8, 0x21
16, 0x42

32, 0x22

64, 0x32

Bottom of Form

The BIOS interrupt 0x1Ah can be used to configure real time clock

TRUE
FALSE

Int14H __________ can be used to set the line parameter of the UART or COM port.

Service # 0

www.vuassignments.com Page 6
 CS609 Solved MCQ mega collection by Arslan Ali and
Zeeshan

Service # 1

Service # 2

None of the given options

The ________ function simply enables the self-test facility within the modem control register.

STOn()
SelfTest()

SelfTestOn()

None of these

______ is used to read time from RTC.

1A/02H
1A/03H

1A/04H

1A/05H

Int14H __________ can be used to receive a byte.

Service # 0
Service # 1

Service # 2

None of the given options

Int _______ service 0 can be used to set the line parameter of the UART or COM port.

14H
15H

13H

None of the given options

______ is used to set time.

1A/02H

www.vuassignments.com Page 7
 CS609 Solved MCQ mega collection by Arslan Ali and
Zeeshan

1A/03H

1A/04H

1A/05H

Each paragraph in keep function is ____ bytes in size.

4
8

16

32

Interrupt 9 usually reads the _________ from keyboard.

ASCII code
Scan code

Both ASCII and Scan code

None of the above

A software interrupt does not require EOI (End of interrupt).

True
False

To store each character in keyboard buffer ____ bytes are required.

2
4

Interrupt _____ is empty; we can use its vector as a flag.

9H
13H

15H

www.vuassignments.com Page 8
 CS609 Solved MCQ mega collection by Arslan Ali and
Zeeshan

65H

Command register is a _____ bit register

4
8

16

32

The interval timer can operate in ____modes.

Three
Four

Five

Six

The following command outportb (0x61,inportb(0x61) | 3); will ________ .

Turn on the speaker

Toggle the speaker

None of the above

The PPI acts as an interface between the CPU and a parallel ________ .

I/O device
CPU

BUS

None of Given

DTE is ____________.

Data terminal equipment

Dual terminal equipment

www.vuassignments.com Page 9
 CS609 Solved MCQ mega collection by Arslan Ali and
Zeeshan

None of the given.

DSR stands for __________

Data set ready

Data stock ready

None of the given

In self-test mode the output of the UART is routed to its input.

True
False

Interrupt ______ is used to get or set the time.

0AH
1AH

2AH

3AH

Communication between keyboard and keyboard controller is __________.

Asynchronous serial
Synchronous serial

Parallel communication

None of the given

Following is not a method of I/O

Programmed I/O
Input driven I/O

Hardware Based I/O

None of given

Which of the following are types of ISR __________.

www.vuassignments.com Page 10
 CS609 Solved MCQ mega collection by Arslan Ali and
Zeeshan

BIOS (Basic I/O service ) ISR

ISR provided by third party device drivers

All of the given

Interrupt service number is usually placed in ____________ register.

CH
CL

AH

AL

NMI Stand for

Non Maskable Interrupt

Non Maskable Instruction

None of Given

A single interrupt controller can arbitrate among ____ different devices.

4
6

10

Hardware Interrupts are __________.

Preemptive
Non-Preemptive

Both Preemptive and Non-Preemptive

None of Given

The microprocessor package has many signals for data. Below are some in Correct priority order (Higher
to Lower).

www.vuassignments.com Page 11
 CS609 Solved MCQ mega collection by Arslan Ali and
Zeeshan

Reset, Hold, NMI, INTR

INTR, NMI, Reset, Hold

None of the Given

The interval timer can operate in ____modes.

Three
Four

Five

Six

PPI stands for _____________.

Parallel Programmable interface

Port Programmable interface

None of the given

BIOS DO NOT support ______.

LPT1
LPT2

LPT3

LPT4

_____ Bit is cleared to indicate the low nibble is being sent.

D1
D2

D3

D4

The bit ______ of Line control register in UART, if cleared will indicate that DLL is the data register.

www.vuassignments.com Page 12
 CS609 Solved MCQ mega collection by Arslan Ali and
Zeeshan

1
3

_________ used to determine the amount of conventional memory interfaced with them processor in
kilobytes.

INT 10 H
INT 11 H

INT 12 H

INT 13 H

Bit number _______ of coprocessor control word is the Interrupt Enable Flag.

7
8

10

To distinguish 486 with Pentium CPUID Test is used.

True
False

______ is LED control byte.

0xF3
0xED

0xE5

0xFF

The memory addresses of COM ports remain same for all computers

True

www.vuassignments.com Page 13
 CS609 Solved MCQ mega collection by Arslan Ali and
Zeeshan

False

Int_____________ service 0 can be used to set the line parameter of the UART or COM port.

14H
15H

13H

None of the given option

In case of synchronous communication a timing signal is required to identify the start and end of a bit.

True
False

BIOS support _____________UARTS as COM ports.

6
4

The function uses the COM port number to receive a byte from the COM port using BIOS services.

recievebyte()
receive()

recievechar()

Int 14H____________ can be used to send a byte

Service#0
Service#1

Service#2

None of the given option.

The _____________function initialize the COM port whose number is passed as parameter using BIOS
services.

www.vuassignments.com Page 14
 CS609 Solved MCQ mega collection by Arslan Ali and
Zeeshan

Initializecom()
Initialize()

Recievechar()

None of these option

XON whenever received indicates the start of communication and XOFF whenever received indicates a
temporary pause in the communication.

True
False

___________ is used to identify cause of interrupt.

Interrupt enable register

Interrupt Status register

None of the above

In ____________each byte is needed to be encapsulated in start and end.

Synchronous communication
Asynchronous communication

Both

None of given

________ is a device incorporated into the PC to update time even if the computer is off.

Clock counter
ROM

Clock

Real time clock

There are two types of communication synchronous and Anti Synchronous

True
False

www.vuassignments.com Page 15
 CS609 Solved MCQ mega collection by Arslan Ali and
Zeeshan

To set the interrupt vector means is to change the double word sized interrupt vector within the IVT.

True
False

www.vuassignments.com Page 16