CS609-Midterm
1 / 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);
2 / 50
Usually interrupt procedures are reentrant procedures especially those interrupt procedure compiled using C language compiler are reentrant.
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
A single interrupt controller can arbitrate among ____ different devices.
5 / 50
The amount of memory above conventional memory (extended memory) can be determined using the service _______.
6 / 50
The keyboard makes use of interrupt number _______ for its input operations.
7 / 50
The BIOS interrupt ________ can be used to configure RTC.
8 / 50
To distinguish 486 with Pentium CPUID Test is used.
9 / 50
The output on the monitor is controlled by a controller called __________within the PC.
10 / 50
Maximum number of interrupts in a standard PC is
11 / 50
Each paragraph in keep function is ____ bytes in size.
12 / 50
_______ is LED control byte.
13 / 50
On the execution of IRET instruction, number of bytes popped from stack is
14 / 50
The PPI acts as an interface between the CPU and a parallel ________ .
15 / 50
Interrupt _____ is empty; we can use its vector as a flag.
16 / 50
Counter register can be used to divide clock signal.
17 / 50
Command register is an _____ bit register
18 / 50
NMI Stand for
19 / 50
Software based flow control make use of -------- control characters
20 / 50
Keyboard uses port ____ as status port.
21 / 50
------------ is used to read date from RTC
22 / 50
At IRQ 7 Interrupt # ___ is used.
23 / 50
Tail of keyboard should get to get the start of buffer.
24 / 50
The -------- function receive a byte and COM port number is passed as parameter using BIOS service
25 / 50
What will be the value of DL register when we are accessing C drive using undocumented service 21H/32H?
26 / 50
The BIOS interrupt 0x1AH can be used to configure real time clock
27 / 50
To store each character in keyboard buffer ____ bytes are required.
28 / 50
DCE stands for __________.
29 / 50
In self test mode the output of the UART is routed to its input.
30 / 50
Int 14H______ can be used to set the line parameter of the UART or COM port
31 / 50
_________ used to determine the amount of conventional memory interfaced with the processor in kilobytes.
32 / 50
Hardware Interrupts are __________.
33 / 50
To access the block within cluster using BIOS services the cluster number should be converted into _____.
34 / 50
Int_____________ service 0 can be used to set the line parameter of the UART or COM port.
35 / 50
File system used in CD’s is_______ file system
36 / 50
Display device (Monitor) performs _________ I/O.
37 / 50
LPTs can be swapped.
38 / 50
Interrupt 9 usually reads the _________ from keyboard.
39 / 50
PPI stands for
40 / 50
___________ is used to identify cause of interrupt.
41 / 50
In self test mode the output of the UART is routed to its input
42 / 50
43 / 50
There are two type of communication synchronous and Anti Synchronous
44 / 50
______ is LED control byte.
45 / 50
Timer interrupt occurs _______ times every second by means of hardware.
46 / 50
The ________function initialize the COM port whose number is passed as parameter using BIOS services.
47 / 50
If we want to produce the grave voice from speaker phone then we have to load the ____ divisor values at Port ____.
48 / 50
By cascading two DMAs ____ bits can be transferred.
49 / 50
PPI is used to perform parallel communication
50 / 50
DMA stands for_________
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