CS609-Midterm
1 / 50
Int 14H______ can be used to set the line parameter of the UART or COM port
2 / 50
In case of synchronous communication a timing signal is required to identify the start and end of a bit.
3 / 50
Communication between keyboard and keyboard controller is __________.
4 / 50
Int 14H __________ can be used to set the line parameter of the UART or COM port.
5 / 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);
6 / 50
____ No. of bytes are used to store the character in the keyboard buffer.
7 / 50
What will be the value of DL register when we are accessing C drive using undocumented service 21H/32H?
8 / 50
PPI stands for
9 / 50
UART stands for_______
10 / 50
The PPI acts as an interface between the CPU and a parallel ________ .
11 / 50
The output on the monitor is controlled by a controller called __________within the PC.
12 / 50
By cascading two DMAs ____ bits can be transferred.
13 / 50
______ is LED control byte.
14 / 50
________ is a device incorporated into the PC to update time even if the computer is off.
15 / 50
_______ is LED control byte.
16 / 50
The bit ______ of Line control register in UART, if cleared will indicate that DLL is the data register.
17 / 50
------------ is used to read date from RTC
18 / 50
The interval timer can operate in ____modes.
19 / 50
Int ________ is used to control the printer via the BIOS.
20 / 50
In order to produce the sound from PC internal Speaker we have to load the___bit divisor value at the ___port.
21 / 50
Timer interrupt occurs _______ times every second by means of hardware.
22 / 50
The keyboard makes use of interrupt number _______ for its input operations.
23 / 50
If we use keep (0, 1000) in a TSR program, the memory allocated to it is
24 / 50
File can be______ viewed as collection of clusters or blocks.
25 / 50
Interrupt 9 usually reads the _________ from keyboard.
26 / 50
Interrupt _____ is empty; we can use its vector as a flag.
27 / 50
There are two type of communication synchronous and Anti Synchronous
28 / 50
In self test mode the output of the UART is routed to its input.
29 / 50
DMA stands for_________
30 / 50
BIOS DO NOT support ______.
31 / 50
DTE is ____________.
32 / 50
Bit number _______ of coprocessor control word is the Interrupt Enable Flag.
33 / 50
IVT is a table containing ______ byte entries each of which is a far address of an interrupt service routine.
34 / 50
35 / 50
The Function of I/O controller is to provide ____________.
36 / 50
To set the interrupt vector means is to change the double word sized interrupt vector within the IVT.
37 / 50
A software interrupt does not require EOI (End of interrupt).
38 / 50
Interrupt service number is usually placed in ____________ register.
39 / 50
LPTs can be swapped.
40 / 50
The following command “outportb (0x61,inportb(0x61) | 3);” will ________ .
41 / 50
Keyboard uses port ____ as status port.
42 / 50
The ____________ function simply enables the self test facility within the modem control register
43 / 50
Following is not a method of I/O
44 / 50
__________is used to control the printer via the BIOS
45 / 50
If CPUID instruction is not present then the processor can be a
46 / 50
The bit number _______ of the coprocessor control word is the interrupt enable flag.
47 / 50
The microprocessor package has many signals for data. Below are some in Correct priority order (Higher to Lower).
48 / 50
An I/O device cannot be directly connected to the busses so controller is placed between CPU and I/O.
49 / 50
There are __________ kinds of serial communication.
50 / 50
Software based flow control make use of -------- control characters
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