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
Which of the following are types of ISR __________.
3 / 50
___________ is used to identify cause of interrupt.
4 / 50
LPTs can be swapped.
5 / 50
Timer interrupt is a _________.
6 / 50
Standard PC operates in two modes in terms of memory which are
7 / 50
In ____________each byte is needed to be encapsulated in start and end.
8 / 50
Each paragraph in keep function is ____ bytes in size.
9 / 50
The following command “outportb (0x61,inportb(0x61) | 3);” will ________ .
10 / 50
The -------- function receive a byte and COM port number is passed as parameter using BIOS service
11 / 50
------------ is used to read time from RTC
12 / 50
The service _________ is called the keyboard hook service.
13 / 50
At IRQ 7 Interrupt # ___ is used.
14 / 50
Interrupt _____ is empty; we can use its vector as a flag.
15 / 50
If we want to produce the grave voice from speaker phone then we have to load the ____ divisor values at Port ____.
16 / 50
________ is a device incorporated into the PC to update time even if the computer is off.
17 / 50
________means typematic rate will be sent in next byte.
18 / 50
Timer interrupt occurs _______ times every second by means of hardware.
19 / 50
20 / 50
The keyboard makes use of interrupt number _______ for its input operations.
21 / 50
In self test mode the output of the UART is routed to its input.
22 / 50
The keyboard input character scan code is received at ___ port.
23 / 50
If printer is _____ then printer sends back the ACK signal to the printer interface
24 / 50
Counter register can be used to divide clock signal.
25 / 50
On the execution of IRET instruction, number of bytes popped from stack is
26 / 50
Int 14H____________ can be used to send a byte
27 / 50
PPI is used to perform parallel communication
28 / 50
The BIOS interrupt 0x1AH can be used to configure real time clock
29 / 50
Total No. of bytes that can be stored in Keyboard Buffer is____.
30 / 50
In case of synchronous communication a timing signal is required to identify the start and end of a bit.
31 / 50
Hardware Interrupts are __________.
32 / 50
_____ bit is cleared to indicate the low nibble is being sent.
33 / 50
The interval timer can operate in _______ modes.
34 / 50
An I/O device cannot be directly connected to the busses so controller is placed between CPU and I/O.
35 / 50
The Function of I/O controller is to provide ____________.
36 / 50
In order to produce the sound from PC internal Speaker we have to load the___bit divisor value at the ___port.
37 / 50
______ is Disk interrupt.
38 / 50
Int 14H______ can be used to set the line parameter of the UART or COM port
39 / 50
Set the Interrupt vector means to change the double word sized interrupt vector within IVT.
40 / 50
41 / 50
Following is not a method of I/O
42 / 50
Software based flow control make use of -------- control characters
43 / 50
Maximum number of interrupts in a standard PC is
44 / 50
Command register is an _____ bit register
45 / 50
DTE is ____________.
46 / 50
Int ________ is used to control the printer via the BIOS.
47 / 50
Interrupt Vector Table (IVT) in short is a _______ bytes sized table.
48 / 50
File system used in CD’s is_______ file system
49 / 50
Display device (Monitor) performs _________ I/O.
50 / 50
Int_____________ service 0 can be used to set the line parameter of the UART or COM port.
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