CS609-Midterm
1 / 50
At IRQ 7 Interrupt # ___ is used.
2 / 50
To access the block within cluster using BIOS services the cluster number should be converted into _____.
3 / 50
What will be the value of DL register when we are accessing C drive using undocumented service 21H/32H?
4 / 50
A software interrupt does not require EOI (End of interrupt).
5 / 50
The ________function initialize the COM port whose number is passed as parameter using BIOS services.
6 / 50
The BIOS interrupt ________ can be used to configure RTC.
7 / 50
If keyboard buffer is empty the head and tail points at the same location.
8 / 50
DTE is ____________.
9 / 50
The interval timer can operate in _______ modes.
10 / 50
Which of the following are types of ISR __________.
11 / 50
______ is Disk interrupt.
12 / 50
Keyboard Status Byte is located at the address
13 / 50
The keyboard makes use of interrupt number _______ for its input operations.
14 / 50
The interval timer can operate in ____modes.
15 / 50
Software based flow control make use of -------- control characters
16 / 50
Standard PC operates in two modes in terms of memory which are
17 / 50
REGS is a Union
18 / 50
DCE is _____________
19 / 50
In counter register bit no. 3 changes its value between 0 and 1 with in ____clock cycles
20 / 50
DMA stands for_________
21 / 50
On the execution of IRET instruction, number of bytes popped from stack is
22 / 50
Interrupt Vector Table (IVT) in short is a _______ bytes sized table.
23 / 50
File system used in CD’s is_______ file system
24 / 50
UART stands for_______
25 / 50
_________ used to determine the amount of conventional memory interfaced with the processor in kilobytes.
26 / 50
Int 14H______ can be used to set the line parameter of the UART or COM port
27 / 50
In self test mode the output of the UART is routed to its input
28 / 50
An I/O device cannot be directly connected to the busses so controller is placed between CPU and I/O.
29 / 50
Each paragraph in keep function is ____ bytes in size.
30 / 50
By cascading two DMAs ____ bits can be transferred.
31 / 50
There are __________ kinds of serial communication.
32 / 50
DCE stands for __________.
33 / 50
Timer interrupt is a _________.
34 / 50
BIOS DO NOT support ______.
35 / 50
LPTs can be swapped.
36 / 50
PPI stands for _____________.
37 / 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);
38 / 50
In case of synchronous communication a timing signal is required to identify the start and end of a bit.
39 / 50
________means typematic rate will be sent in next byte.
40 / 50
_____ bit is cleared to indicate the low nibble is being sent.
41 / 50
In self test mode the output of the UART is routed to its input.
42 / 50
Register can be used to divide frequency is _________
43 / 50
------------ whenever receive indicates the start of communication ……….. whenever receive indicates the end of communication
44 / 50
The microprocessor package has many signals for data. Below are some in Correct priority order (Higher to Lower).
45 / 50
_______ is LED control byte.
46 / 50
Only ________ ports are important from programming point of view.
47 / 50
To store each character in keyboard buffer ____ bytes are required.
48 / 50
The service _________ is called the keyboard hook service.
49 / 50
IVT is a table containing ______ byte entries each of which is a far address of an interrupt service routine.
50 / 50
______ is LED control byte.
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