CS609-Midterm
1 / 50
Interrupt _____ is empty; we can use its vector as a flag.
2 / 50
In counter register bit no. 3 changes its value between 0 and 1 with in ____clock cycles
3 / 50
We have set the bit No. 7 of IMR(Interrupt Mask Register) to unmask the Interrupt so that interrupt _____ can occur at ____ line.
4 / 50
To set the interrupt vector means is to change the double word sized interrupt vector within the IVT.
5 / 50
A software interrupt does not require EOI (End of interrupt).
6 / 50
Int 14H __________ can be used to set the line parameter of the UART or COM port.
7 / 50
IVT is a table containing ______ byte entries each of which is a far address of an interrupt service routine.
8 / 50
Keyboard Status Byte is located at the address
9 / 50
_________ used to determine the amount of conventional memory interfaced with the processor in kilobytes.
10 / 50
A single interrupt controller can arbitrate among ____ different devices.
11 / 50
______ is LED control byte.
12 / 50
PPI stands for _____________.
13 / 50
Int 14H______ can be used to set the line parameter of the UART or COM port
14 / 50
Keyboard uses port ____ as status port.
15 / 50
________ is a device incorporated into the PC to update time even if the computer is off.
16 / 50
______ is Disk interrupt.
17 / 50
In self test mode the output of the UART is routed to its input.
18 / 50
Which of the following are types of ISR __________.
19 / 50
To access the block within cluster using BIOS services the cluster number should be converted into _____.
20 / 50
Only ________ ports are important from programming point of view.
21 / 50
Usually interrupt procedures are reentrant procedures especially those interrupt procedure compiled using C language compiler are reentrant.
22 / 50
In ____________each byte is needed to be encapsulated in start and end.
23 / 50
------------ whenever receive indicates the start of communication ……….. whenever receive indicates the end of communication
24 / 50
Interrupt ______ is used to get or set the time.
25 / 50
Maximum number of interrupts in a standard PC is
26 / 50
There are __________ kinds of serial communication.
27 / 50
Following is not a method of I/O
28 / 50
Total No. of bytes that can be stored in Keyboard Buffer is____.
29 / 50
Operating system name contains ____ bytes in boot block.
30 / 50
To distinguish 486 with Pentium CPUID Test is used.
31 / 50
In case of synchronous communication a timing signal is required to identify the start and end of a bit.
32 / 50
The ________function initialize the COM port whose number is passed as parameter using BIOS services.
33 / 50
Display device (Monitor) performs _________ I/O.
34 / 50
Which port is known as Data Port______
35 / 50
The bit ______ of Line control register in UART, if cleared will indicate that DLL is the data register.
36 / 50
The keyboard makes use of interrupt number _______ for its input operations.
37 / 50
Control information in files is maintained using
38 / 50
By cascading two DMAs ____ bits can be transferred.
39 / 50
The output on the monitor is controlled by a controller called __________within the PC.
40 / 50
Hardware Interrupts are __________.
41 / 50
UART stands for_______
42 / 50
Timer interrupt is a _________.
43 / 50
44 / 50
The PPI acts as an interface between the CPU and a parallel ________ .
45 / 50
DCE stands for __________.
46 / 50
47 / 50
REGS is a Union
48 / 50
Tail of keyboard should get to get the start of buffer.
49 / 50
____ No. of bytes are used to store the character in the keyboard buffer.
50 / 50
BIOS DO NOT support ______.
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