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
In order to produce the sound from PC internal Speaker we have to load the___bit divisor value at the ___port.
3 / 50
On the execution of IRET instruction, number of bytes popped from stack is
4 / 50
The service _________ is called the keyboard hook service.
5 / 50
The BIOS interrupt 0x1AH can be used to configure real time clock
6 / 50
IVT is a table containing ______ byte entries each of which is a far address of an interrupt service routine.
7 / 50
Which of the following are types of ISR __________.
8 / 50
The output on the monitor is controlled by a controller called __________within the PC.
9 / 50
Total No. of bytes that can be stored in Keyboard Buffer is____.
10 / 50
File system used in CD’s is_______ file system
11 / 50
The ____________ function simply enables the self test facility within the modem control register
12 / 50
The following command “outportb (0x61,inportb(0x61) | 3);” will ________ .
13 / 50
BIOS DO NOT support ______.
14 / 50
By cascading two DMAs ____ bits can be transferred.
15 / 50
BIOS support _____________UARTS as COM ports.
16 / 50
17 / 50
If we use keep (0, 1000) in a TSR program, the memory allocated to it is
18 / 50
______ is Disk interrupt.
19 / 50
The bit ______ of Line control register in UART, if cleared will indicate that DLL is the data register.
20 / 50
DCE is _____________
21 / 50
The PPI acts as an interface between the CPU and a parallel ________ .
22 / 50
Interrupt service number is usually placed in ____________ register.
23 / 50
There are two main types of interrupts, namely
24 / 50
In self test mode the output of the UART is routed to its input.
25 / 50
Interrupt Vector Table (IVT) in short is a _______ bytes sized table.
26 / 50
In case of synchronous communication a timing signal is required to identify the start and end of a bit.
27 / 50
There are two main types of interrupts namely _________________.
28 / 50
The -------- function receive a byte and COM port number is passed as parameter using BIOS service
29 / 50
30 / 50
The BIOS interrupt ________ can be used to configure RTC.
31 / 50
_________ used to determine the amount of conventional memory interfaced with the processor in kilobytes.
32 / 50
UART stands for_______
33 / 50
If CPUID instruction is not present then the processor can be a
34 / 50
The following command “outportb (0x61,inportb(0x61) & 0xFC);” will
35 / 50
To distinguish 486 with Pentium CPUID Test is used.
36 / 50
To set the interrupt vector means is to change the double word sized interrupt vector within the IVT.
37 / 50
DCE stands for __________.
38 / 50
Only ________ ports are important from programming point of view.
39 / 50
PPI stands for
40 / 50
Maximum number of interrupts in a standard PC is
41 / 50
________ is a device incorporated into the PC to update time even if the computer is off.
42 / 50
Bit number _______ of coprocessor control word is the Interrupt Enable Flag.
43 / 50
____whenever received indicates the start of communication and ______ whenever received indicates a temporary pause in the communication.
44 / 50
Communication between keyboard and keyboard controller is __________.
45 / 50
In self test mode the output of the UART is routed to its input
46 / 50
The service number is usually placed in the ________ register.
47 / 50
Software based flow control make use of -------- control characters
48 / 50
The ________function initialize the COM port whose number is passed as parameter using BIOS services.
49 / 50
Keyboard Status Byte is located at the address
50 / 50
Keyboard uses port ____ as status port.
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