CS609-Midterm
1 / 50
The keyboard makes use of interrupt number _______ for its input operations.
2 / 50
______ is Disk interrupt.
3 / 50
BIOS support _____________UARTS as COM ports.
4 / 50
The PPI acts as an interface between the CPU and a parallel ________ .
5 / 50
Int 14H __________ can be used to set the line parameter of the UART or COM port.
6 / 50
In case of synchronous communication a timing signal is required to identify the start and end of a bit.
7 / 50
Hardware Interrupts are __________.
8 / 50
DSR stands for __________ .
9 / 50
DMA stands for_________
10 / 50
Register can be used to divide frequency is _________
11 / 50
___________ is used to identify cause of interrupt.
12 / 50
What will be the value of DL register when we are accessing C drive using undocumented service 21H/32H?
13 / 50
The ________function initialize the COM port whose number is passed as parameter using BIOS services.
14 / 50
Only ________ ports are important from programming point of view.
15 / 50
16 / 50
An I/O device cannot be directly connected to the busses so controller is placed between CPU and I/O.
17 / 50
To access the block within cluster using BIOS services the cluster number should be converted into _____.
18 / 50
The keyboard input character scan code is received at ___ port.
19 / 50
In ____________each byte is needed to be encapsulated in start and end.
20 / 50
Int 14H __________ can be used to receive a byte.
21 / 50
Display device (Monitor) performs _________ I/O.
22 / 50
The microprocessor package has many signals for data. Below are some in Correct priority order (Higher to Lower).
23 / 50
Tail of keyboard should get to get the start of buffer.
24 / 50
Maximum number of interrupts in a standard PC is
25 / 50
BPB stands for _________.
26 / 50
There are two type of communication synchronous and Anti Synchronous
27 / 50
We have set the bit No. 7 of IMR(Interrupt Mask Register) to unmask the Interrupt so that interrupt _____ can occur at ____ line.
28 / 50
DTE is ___________
29 / 50
_____ bit is cleared to indicate the low nibble is being sent.
30 / 50
PPI stands for _____________.
31 / 50
______ is LED control byte.
32 / 50
33 / 50
Keyboard Status Byte is located at the address
34 / 50
File system used in CD’s is_______ file system
35 / 50
The ______ service # is not used in any interrupt.
36 / 50
The Function of I/O controller is to provide ____________.
37 / 50
Standard PC operates in two modes in terms of memory which are
38 / 50
REGS is a Union
39 / 50
40 / 50
Operating system name contains ____ bytes in boot block.
41 / 50
There are two main types of interrupts, namely
42 / 50
Timer interrupt is a _________.
43 / 50
44 / 50
____ No. of bytes are used to store the character in the keyboard buffer.
45 / 50
The interval timer can operate in ____modes.
46 / 50
On the execution of IRET instruction, number of bytes popped from stack is
47 / 50
Keyboard uses port ____ as status port.
48 / 50
LPTs can be swapped.
49 / 50
The following command “outportb (0x61,inportb(0x61) | 3);” will ________ .
50 / 50
DCE is _____________
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