CS609-Midterm
1 / 50
The interval timer can operate in _______ modes.
2 / 50
_______ is LED control byte.
3 / 50
Register can be used to divide frequency is _________
4 / 50
In counter register bit no. 3 changes its value between 0 and 1 with in ____clock cycles
5 / 50
_________ used to determine the amount of conventional memory interfaced with the processor in kilobytes.
6 / 50
The bit ______ of Line control register in UART, if cleared will indicate that DLL is the data register.
7 / 50
BIOS DO NOT support ______.
8 / 50
DSR stands for __________ .
9 / 50
DTE is ____________.
10 / 50
Counter register can be used to divide clock signal.
11 / 50
The keyboard makes use of interrupt number _______ for its input operations.
12 / 50
__________is used to control the printer via the BIOS
13 / 50
14 / 50
The ____________ function simply enables the self test facility within the modem control register
15 / 50
Following is not a method of I/O
16 / 50
Software based flow control make use of -------- control characters
17 / 50
Hardware Interrupts are __________.
18 / 50
______ is used to set time.
19 / 50
The following command “outportb (0x61,inportb(0x61) | 3);” will ________ .
20 / 50
The ______ service # is not used in any interrupt.
21 / 50
The output on the monitor is controlled by a controller called __________within the PC.
22 / 50
Each paragraph in keep function is ____ bytes in size.
23 / 50
The PPI acts as an interface between the CPU and a parallel ________ .
24 / 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);
25 / 50
File system used in CD’s is_______ file system
26 / 50
In self test mode the output of the UART is routed to its input.
27 / 50
The amount of memory above conventional memory (extended memory) can be determined using the service _______.
28 / 50
Only ________ ports are important from programming point of view.
29 / 50
In ____________each byte is needed to be encapsulated in start and end.
30 / 50
------------ whenever receive indicates the start of communication ……….. whenever receive indicates the end of communication
31 / 50
____ No. of bytes are used to store the character in the keyboard buffer.
32 / 50
Int 14H______ can be used to set the line parameter of the UART or COM port
33 / 50
We have set the bit No. 7 of IMR(Interrupt Mask Register) to unmask the Interrupt so that interrupt _____ can occur at ____ line.
34 / 50
Int 14H __________ can be used to receive a byte.
35 / 50
Standard PC can have _____ PPI.
36 / 50
An I/O device cannot be directly connected to the busses so controller is placed between CPU and I/O.
37 / 50
On the execution of IRET instruction, number of bytes popped from stack is
38 / 50
Interrupt _____ is empty; we can use its vector as a flag.
39 / 50
UART stands for_______
40 / 50
To store each character in keyboard buffer ____ bytes are required.
41 / 50
Keyboard uses port ____ as status port.
42 / 50
____whenever received indicates the start of communication and ______ whenever received indicates a temporary pause in the communication.
43 / 50
Which port is known as Data Port______
44 / 50
If we want to produce the grave voice from speaker phone then we have to load the ____ divisor values at Port ____.
45 / 50
DMA stands for_________
46 / 50
_____ bit is cleared to indicate the low nibble is being sent.
47 / 50
By cascading two DMAs ____ bits can be transferred.
48 / 50
Interrupt service number is usually placed in ____________ register.
49 / 50
50 / 50
The service number is usually placed in the ________ register.
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