CS609-Midterm
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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);
2 / 50
DCE is _____________
3 / 50
On the execution of IRET instruction, number of bytes popped from stack is
4 / 50
If we want to produce the grave voice from speaker phone then we have to load the ____ divisor values at Port ____.
5 / 50
The keyboard makes use of interrupt number _______ for its input operations.
6 / 50
By cascading two DMAs ____ bits can be transferred.
7 / 50
_____ bit is cleared to indicate the low nibble is being sent.
8 / 50
The interval timer can operate in _______ modes.
9 / 50
The amount of memory above conventional memory (extended memory) can be determined using the service _______.
10 / 50
Usually interrupt procedures are reentrant procedures especially those interrupt procedure compiled using C language compiler are reentrant.
11 / 50
Only ________ ports are important from programming point of view.
12 / 50
Tail of keyboard should get to get the start of buffer.
13 / 50
Set the Interrupt vector means to change the double word sized interrupt vector within IVT.
14 / 50
In case of synchronous communication a timing signal is required to identify the start and end of a bit.
15 / 50
UART stands for_______
16 / 50
_______ is LED control byte.
17 / 50
Which of the following are types of ISR __________.
18 / 50
The service _________ is called the keyboard hook service.
19 / 50
________ is a device incorporated into the PC to update time even if the computer is off.
20 / 50
DSR stands for __________ .
21 / 50
A software interrupt does not require EOI (End of interrupt).
22 / 50
There are __________ kinds of serial communication.
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Int 14H __________ can be used to set the line parameter of the UART or COM port.
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26 / 50
Keyboard Status Byte is located at the address
27 / 50
File can be______ viewed as collection of clusters or blocks.
28 / 50
The interval timer can operate in ____modes.
29 / 50
Keyboard uses port ____ as status port.
30 / 50
_________ is used to identify the cause of interrupt.
31 / 50
BPB stands for _________.
32 / 50
33 / 50
The keyboard input character scan code is received at ___ port.
34 / 50
_________ used to determine the amount of conventional memory interfaced with the processor in kilobytes.
35 / 50
To access the block within cluster using BIOS services the cluster number should be converted into _____.
36 / 50
If CPUID instruction is not present then the processor can be a
37 / 50
____whenever received indicates the start of communication and ______ whenever received indicates a temporary pause in the communication.
38 / 50
Int 14H __________ can be used to receive a byte.
39 / 50
______ is used to set time.
40 / 50
File system used in CD’s is_______ file system
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Which port is known as Data Port______
42 / 50
BIOS DO NOT support ______.
43 / 50
The ____________ function simply enables the self test facility within the modem control register
44 / 50
DTE is ___________
45 / 50
REGS is a Union
46 / 50
The PPI acts as an interface between the CPU and a parallel ________ .
47 / 50
The following command “outportb (0x61,inportb(0x61) | 3);” will ________ .
48 / 50
49 / 50
A single interrupt controller can arbitrate among ____ different devices.
50 / 50
Operating system name contains ____ bytes in boot block.
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