Multiple Choice Questions (MCQs)
There are two main types of interrupts, namely
Standard PC operates in two modes in terms of memory which are
BPB stands for ________.
The Function of I/O controller is to provide ________.
IVT is a table containing ______ byte entries each of which is a far address of an interrupt service routine.
The ______ service # is not used in any interrupt.
To set the interrupt vector means is to change the double word sized interrupt vector within the IVT.
If the following function, keep(1, 1000); is called in the TSR program, it means that ________ No. of bytes are reserved in the memory.
The service number is usually placed in the ________ register.
The output on the monitor is controlled by a controller called __________ within the PC.
The keyboard makes use of interrupt number ________ for its input operations.
The service _________ is called the keyboard hook service.
______ is Disk interrupt.
Which of the following register is used, if you want to block access of any Hardware.
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);
Total No. of bytes that can be stored in Keyboard Buffer is_________.
________ No. of bytes are used to store the character in the key board buffer.
Counter register can be used to divide clock signal.
If we want to produce the shrill voice from the speaker phone then we have to load the _________ divisor value at Port _________.
In order to produce the sound from PC internal Speaker we have to load the _________ bit divisor value at the _________ port.
If printer is __________ then printer sends back the ACK signal to the printer interface.
_______ store the base address for LPT1.
Int ________ is used to control the printer via the BIOS.
If we want to send printing on the printer then we have to perform following steps.
At IRQ7 Interrupt # __________ is used.
There are two types of communication; synchronous and anti synchronous
DCE is ___________.
There are ________ kinds of serial communication.
DTE is _________.
In _______ each byte is needed to be encapsulated in start and end.
In case of synchronous communication a timing signal is required to identify the start and end of a bit.
_______ is used to identify the cause of interrupt.
BIOS support _________UARTS as COM ports.
The baud rate is set in accordance with the divisor value loaded within the UART internal registers base +0 and base +1.
The memory addresses of COM ports remain same for all computers.
DSR stands for _________.
Int _________ service 0 can be used to set the line parameter of the URT or COM port.
Int 14H __________ can be used to set the line parameter of the UART or COM port.
Int 14H __________ can be used to send a byte.
The __________ function simply enables the self test facility within the modem control register.
The _________ function uses the COM port number to receive a byte from the COM port using BIOS services.
The _________ function initializes COM port whose number is passed as a parameter using BIOS services.
Only _______ ports are important from programming point of view.
______whenever received indicates the start of communication and ______ whenever received indicates a temporary pause in the communication.
________ is used to read time from RTC.
The BIOS interrupt ________ can be used to configure RTC.
XON whenever received indicates the start of communication and XOFF whenever received indicates a temporary pause in the communication.
_______ is a device incorporated into the PC to update time even if the computer is off.
The amount of memory above conventional memory (extended memory) can be determined using the service _______.
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