CS609 Midterm Online Quiz

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CS609-Midterm

1 / 50

At IRQ 7 Interrupt # ___ is used.

2 / 50

To access the block within cluster using BIOS services the cluster number should be converted into _____.

3 / 50

What will be the value of DL register when we are accessing C drive using undocumented service 21H/32H?

4 / 50

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

5 / 50

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

6 / 50

The BIOS interrupt ________ can be used to configure RTC.

7 / 50

If keyboard buffer is empty the head and tail points at the same location.

8 / 50

DTE is ____________.

9 / 50

The interval timer can operate in _______ modes.

10 / 50

Which of the following are types of ISR __________.

11 / 50

______ is Disk interrupt.

12 / 50

Keyboard Status Byte is located at the address

13 / 50

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

14 / 50

The interval timer can operate in ____modes.

15 / 50

Software based flow control make use of -------- control characters

16 / 50

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

17 / 50

REGS is a Union

18 / 50

DCE is _____________

19 / 50

In counter register bit no. 3 changes its value between 0 and 1 with in ____clock cycles

20 / 50

DMA stands for_________

21 / 50

On the execution of IRET instruction, number of bytes popped from stack is

22 / 50

Interrupt Vector Table (IVT) in short is a _______ bytes sized table.

23 / 50

File system used in CD’s is_______ file system

24 / 50

UART stands for_______

25 / 50

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

26 / 50

Int 14H______ can be used to set the line parameter of the UART or COM port

27 / 50

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

28 / 50

An I/O device cannot be directly connected to the busses so controller is placed between CPU and I/O.

29 / 50

Each paragraph in keep function is ____ bytes in size.

30 / 50

By cascading two DMAs ____ bits can be transferred.

31 / 50

There are __________ kinds of serial communication.

32 / 50

DCE stands for __________.

33 / 50

Timer interrupt is a _________.

34 / 50

BIOS DO NOT support ______.

35 / 50

LPTs can be swapped.

36 / 50

PPI stands for _____________.

37 / 50

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);

38 / 50

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

39 / 50

________means typematic rate will be sent in next byte.

40 / 50

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

41 / 50

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

42 / 50

Register can be used to divide frequency is _________

43 / 50

------------ whenever receive indicates the start of communication ……….. whenever receive indicates the end of communication

44 / 50

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

45 / 50

_______ is LED control byte.

46 / 50

Only ________ ports are important from programming point of view.

47 / 50

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

48 / 50

The service _________ is called the keyboard hook service.

49 / 50

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

50 / 50

______ is LED control byte.

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