CS609-Midterm
1 / 50
In case of synchronous communication a timing signal is required to identify the start and end of a bit.
2 / 50
Interrupt service number is usually placed in ____________ register.
3 / 50
REGS is a Union
4 / 50
Software based flow control make use of -------- control characters
5 / 50
In counter register bit no. 3 changes its value between 0 and 1 with in ____clock cycles
6 / 50
BIOS support _____________UARTS as COM ports.
7 / 50
Hardware Interrupts are __________.
8 / 50
Int 14H __________ can be used to set the line parameter of the UART or COM port.
9 / 50
What will be the value of DL register when we are accessing C drive using undocumented service 21H/32H?
10 / 50
The keyboard input character scan code is received at ___ port.
11 / 50
In self test mode the output of the UART is routed to its input.
12 / 50
To access the block within cluster using BIOS services the cluster number should be converted into _____.
13 / 50
By cascading two DMAs ____ bits can be transferred.
14 / 50
If keyboard buffer is empty the head and tail points at the same location.
15 / 50
Usually interrupt procedures are reentrant procedures especially those interrupt procedure compiled using C language compiler are reentrant.
16 / 50
Timer interrupt occurs _______ times every second by means of hardware.
17 / 50
The output on the monitor is controlled by a controller called __________within the PC.
18 / 50
________ is a device incorporated into the PC to update time even if the computer is off.
19 / 50
Interrupt _____ is empty; we can use its vector as a flag.
20 / 50
To store each character in keyboard buffer ____ bytes are required.
21 / 50
The BIOS interrupt 0x1AH can be used to configure real time clock
22 / 50
Timer interrupt is a _________.
23 / 50
Interrupt 9 usually reads the _________ from keyboard.
24 / 50
BIOS DO NOT support ______.
25 / 50
Bit number _______ of coprocessor control word is the Interrupt Enable Flag.
26 / 50
Following is not a method of I/O
27 / 50
Total No. of bytes that can be stored in Keyboard Buffer is____.
28 / 50
To set the interrupt vector means is to change the double word sized interrupt vector within the IVT.
29 / 50
_____ bit is cleared to indicate the low nibble is being sent.
30 / 50
To distinguish 486 with Pentium CPUID Test is used.
31 / 50
The ____________ function simply enables the self test facility within the modem control register
32 / 50
PPI stands for
33 / 50
There are two type of communication synchronous and Anti Synchronous
34 / 50
The________ function uses the COM port number to receive a byte from the COM port using BIOS services.
35 / 50
Counter register can be used to divide clock signal.
36 / 50
Set the Interrupt vector means to change the double word sized interrupt vector within IVT.
37 / 50
The bit number _______ of the coprocessor control word is the interrupt enable flag.
38 / 50
DCE stands for __________.
39 / 50
A single interrupt controller can arbitrate among ____ different devices.
40 / 50
Register can be used to divide frequency is _________
41 / 50
_______ is LED control byte.
42 / 50
LPTs can be swapped.
43 / 50
IVT is a table containing ______ byte entries each of which is a far address of an interrupt service routine.
44 / 50
Int 14H______ can be used to set the line parameter of the UART or COM port
45 / 50
____whenever received indicates the start of communication and ______ whenever received indicates a temporary pause in the communication.
46 / 50
BPB stands for _________.
47 / 50
Int 14H____________ can be used to send a byte
48 / 50
Standard PC operates in two modes in terms of memory which are
49 / 50
50 / 50
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