CS609-Midterm
1 / 50
An I/O device cannot be directly connected to the busses so controller is placed between CPU and I/O.
2 / 50
To store each character in keyboard buffer ____ bytes are required.
3 / 50
Hardware Interrupts are __________.
4 / 50
In self test mode the output of the UART is routed to its input.
5 / 50
Int ________ is used to control the printer via the BIOS.
6 / 50
To set the interrupt vector means is to change the double word sized interrupt vector within the IVT.
7 / 50
Register can be used to divide frequency is _________
8 / 50
Standard PC operates in two modes in terms of memory which are
9 / 50
_____ bit is cleared to indicate the low nibble is being sent.
10 / 50
_________ used to determine the amount of conventional memory interfaced with the processor in kilobytes.
11 / 50
The amount of memory above conventional memory (extended memory) can be determined using the service _______.
12 / 50
In ____________each byte is needed to be encapsulated in start and end.
13 / 50
Keyboard uses port ____ as status port.
14 / 50
BPB stands for _________.
15 / 50
The bit ______ of Line control register in UART, if cleared will indicate that DLL is the data register.
16 / 50
Int_____________ service 0 can be used to set the line parameter of the UART or COM port.
17 / 50
Maximum number of interrupts in a standard PC is
18 / 50
Display device (Monitor) performs _________ I/O.
19 / 50
20 / 50
The keyboard makes use of interrupt number _______ for its input operations.
21 / 50
____whenever received indicates the start of communication and ______ whenever received indicates a temporary pause in the communication.
22 / 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);
23 / 50
24 / 50
In self test mode the output of the UART is routed to its input
25 / 50
Tail of keyboard should get to get the start of buffer.
26 / 50
By cascading two DMAs ____ bits can be transferred.
27 / 50
There are two main types of interrupts, namely
28 / 50
DCE stands for __________.
29 / 50
Standard PC can have _____ PPI.
30 / 50
Usually interrupt procedures are reentrant procedures especially those interrupt procedure compiled using C language compiler are reentrant.
31 / 50
Timer interrupt is a _________.
32 / 50
DSR stands for __________ .
33 / 50
Command register is an _____ bit register
34 / 50
In case of synchronous communication a timing signal is required to identify the start and end of a bit.
35 / 50
LPTs can be swapped.
36 / 50
Int 14H __________ can be used to set the line parameter of the UART or COM port.
37 / 50
The following command “outportb (0x61,inportb(0x61) & 0xFC);” will
38 / 50
In counter register bit no. 3 changes its value between 0 and 1 with in ____clock cycles
39 / 50
___________ is used to identify cause of interrupt.
40 / 50
DTE is ____________.
41 / 50
42 / 50
The following command “outportb (0x61,inportb(0x61) | 3);” will ________ .
43 / 50
File system used in CD’s is_______ file system
44 / 50
______ is used to set time.
45 / 50
------------ whenever receive indicates the start of communication ……….. whenever receive indicates the end of communication
46 / 50
Int 14H __________ can be used to receive a byte.
47 / 50
Interrupt Vector Table (IVT) in short is a _______ bytes sized table.
48 / 50
Int 14H____________ can be used to send a byte
49 / 50
Following is not a method of I/O
50 / 50
The output on the monitor is controlled by a controller called __________within the PC.
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