CS609-Midterm
1 / 50
To store each character in keyboard buffer ____ bytes are required.
2 / 50
In case of synchronous communication a timing signal is required to identify the start and end of a bit.
3 / 50
At IRQ 7 Interrupt # ___ is used.
4 / 50
On the execution of IRET instruction, number of bytes popped from stack is
5 / 50
6 / 50
BIOS DO NOT support ______.
7 / 50
The service number is usually placed in the ________ register.
8 / 50
By cascading two DMAs ____ bits can be transferred.
9 / 50
Timer interrupt is a _________.
10 / 50
The ________function initialize the COM port whose number is passed as parameter using BIOS services.
11 / 50
There are two type of communication synchronous and Anti Synchronous
12 / 50
An I/O device cannot be directly connected to the busses so controller is placed between CPU and I/O.
13 / 50
____ No. of bytes are used to store the character in the keyboard buffer.
14 / 50
________means typematic rate will be sent in next byte.
15 / 50
Int_____________ service 0 can be used to set the line parameter of the UART or COM port.
16 / 50
Display device (Monitor) performs _________ I/O.
17 / 50
Int 14H __________ can be used to set the line parameter of the UART or COM port.
18 / 50
DCE stands for __________.
19 / 50
The -------- function receive a byte and COM port number is passed as parameter using BIOS service
20 / 50
REGS is a Union
21 / 50
The interval timer can operate in _______ modes.
22 / 50
In counter register bit no. 3 changes its value between 0 and 1 with in ____clock cycles
23 / 50
__________is used to control the printer via the BIOS
24 / 50
DTE is ____________.
25 / 50
______ is LED control byte.
26 / 50
Each paragraph in keep function is ____ bytes in size.
27 / 50
To access the block within cluster using BIOS services the cluster number should be converted into _____.
28 / 50
Only ________ ports are important from programming point of view.
29 / 50
The BIOS interrupt 0x1AH can be used to configure real time clock
30 / 50
In self test mode the output of the UART is routed to its input.
31 / 50
The output on the monitor is controlled by a controller called __________within the PC.
32 / 50
BIOS support _____________UARTS as COM ports.
33 / 50
___________ is used to identify cause of interrupt.
34 / 50
PPI stands for _____________.
35 / 50
What will be the value of DL register when we are accessing C drive using undocumented service 21H/32H?
36 / 50
IVT is a table containing ______ byte entries each of which is a far address of an interrupt service routine.
37 / 50
The bit number _______ of the coprocessor control word is the interrupt enable flag.
38 / 50
The following command “outportb (0x61,inportb(0x61) & 0xFC);” will
39 / 50
40 / 50
If printer is _____ then printer sends back the ACK signal to the printer interface
41 / 50
Hardware Interrupts are __________.
42 / 50
Following is not a method of I/O
43 / 50
The BIOS interrupt ________ can be used to configure RTC.
44 / 50
Bit number _______ of coprocessor control word is the Interrupt Enable Flag.
45 / 50
Total No. of bytes that can be stored in Keyboard Buffer is____.
46 / 50
Set the Interrupt vector means to change the double word sized interrupt vector within IVT.
47 / 50
The PPI acts as an interface between the CPU and a parallel ________ .
48 / 50
49 / 50
UART stands for_______
50 / 50
Which port is known as Data Port______
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