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
- XOFF & XON
- XON & YOFF
- YON & XOFF
There are two main types of interrupts, namely
- PC based and Window based
- Hardware based and Kernal 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
- Base mode and Memory Mode
- None of the given
- Real mode and protected mode
BPB stands for _________.
- BIOS parameter block
- BIOS processing block
- Base processing block
- BIOS partition block
The Function of I/O controller is to provide ____________.
- I/O control signals
- Buffering
- 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
- 8
- 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
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
- 4
- 5
________ store the base address for LPT1.
- 40:00H
- 40:02H
- 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
- 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)
- 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
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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
- 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
- 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
- 6
- 8
Interrupt _____ is empty; we can use its vector as a flag.
- 9H
- 13H
- 15H
- 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
- Turn off 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
- Data transmitting equipment
- Dual terminal equipment
- None of the given.
DSR stands for __________
- Data set ready
- Data service 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 __________.
- BIOS (Basic I/O service ) ISR
- DOS 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 Multitude Interrupt
- Non Maskable Instruction
- None of Given
A single interrupt controller can arbitrate among ____ different devices.
- 4
- 6
- 8
- 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).
- Reset, Hold, NMI, INTR
- NMI, INTR, Hold, Reset
- 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
- Peripheral 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.
- 1
- 3
- 5
- 7
_________ 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
- 9
- 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
- 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
- 3
- 2
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.
- 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 ID 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
To set the interrupt vector means is to change the double word sized interrupt vector within the IVT.
- True
- False