CS609-Midterm
1 / 50
The following command “outportb (0x61,inportb(0x61) & 0xFC);” will
2 / 50
Int 14H __________ can be used to receive a byte.
3 / 50
Control information in files is maintained using
4 / 50
Interrupt 9 usually reads the _________ from keyboard.
5 / 50
In case of synchronous communication a timing signal is required to identify the start and end of a bit.
6 / 50
Which of the following are types of ISR __________.
7 / 50
Int 14H____________ can be used to send a byte
8 / 50
The keyboard makes use of interrupt number _______ for its input operations.
9 / 50
______ is used to set time.
10 / 50
The interval timer can operate in ____modes.
11 / 50
DMA stands for_________
12 / 50
BPB stands for _________.
13 / 50
Display device (Monitor) performs _________ I/O.
14 / 50
Standard PC operates in two modes in terms of memory which are
15 / 50
_____ bit is cleared to indicate the low nibble is being sent.
16 / 50
The ______ service # is not used in any interrupt.
17 / 50
DSR stands for __________ .
18 / 50
If we want to produce the grave voice from speaker phone then we have to load the ____ divisor values at Port ____.
19 / 50
The amount of memory above conventional memory (extended memory) can be determined using the service _______.
20 / 50
UART stands for_______
21 / 50
DTE is ____________.
22 / 50
Maximum number of interrupts in a standard PC is
23 / 50
REGS is a Union
24 / 50
The service number is usually placed in the ________ register.
25 / 50
If we use keep (0, 1000) in a TSR program, the memory allocated to it is
26 / 50
Interrupt service number is usually placed in ____________ register.
27 / 50
___________ is used to identify cause of interrupt.
28 / 50
PPI is used to perform parallel communication
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______ is Disk interrupt.
30 / 50
BIOS support _____________UARTS as COM ports.
31 / 50
The PPI acts as an interface between the CPU and a parallel ________ .
32 / 50
DTE is ___________
33 / 50
IVT is a table containing ______ byte entries each of which is a far address of an interrupt service routine.
34 / 50
____ No. of bytes are used to store the character in the keyboard buffer.
35 / 50
________ is a device incorporated into the PC to update time even if the computer is off.
36 / 50
37 / 50
To access the block within cluster using BIOS services the cluster number should be converted into _____.
38 / 50
------------ is used to set time from RTC
39 / 50
In self test mode the output of the UART is routed to its input
40 / 50
In ____________each byte is needed to be encapsulated in start and end.
41 / 50
42 / 50
The interval timer can operate in _______ modes.
43 / 50
The -------- function receive a byte and COM port number is passed as parameter using BIOS service
44 / 50
Total No. of bytes that can be stored in Keyboard Buffer is____.
45 / 50
Tail of keyboard should get to get the start of buffer.
46 / 50
By cascading two DMAs ____ bits can be transferred.
47 / 50
The Function of I/O controller is to provide ____________.
48 / 50
DCE is _____________
49 / 50
50 / 50
DCE stands for __________.
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