CS609-Midterm
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The________ function uses the COM port number to receive a byte from the COM port using BIOS services.
2 / 50
In counter register bit no. 3 changes its value between 0 and 1 with in ____clock cycles
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Only ________ ports are important from programming point of view.
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Total No. of bytes that can be stored in Keyboard Buffer is____.
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Timer interrupt occurs _______ times every second by means of hardware.
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The keyboard makes use of interrupt number _______ for its input operations.
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Software based flow control make use of -------- control characters
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To store each character in keyboard buffer ____ bytes are required.
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Timer interrupt is a _________.
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PPI stands for _____________.
11 / 50
On the execution of IRET instruction, number of bytes popped from stack is
12 / 50
To distinguish 486 with Pentium CPUID Test is used.
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File can be______ viewed as collection of clusters or blocks.
14 / 50
Interrupt 9 usually reads the _________ from keyboard.
15 / 50
Keyboard Status Byte is located at the address
16 / 50
Interrupt Vector Table (IVT) in short is a _______ bytes sized table.
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Communication between keyboard and keyboard controller is __________.
18 / 50
The ________function initialize the COM port whose number is passed as parameter using BIOS services.
19 / 50
If we want to produce the grave voice from speaker phone then we have to load the ____ divisor values at Port ____.
20 / 50
________means typematic rate will be sent in next byte.
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The Function of I/O controller is to provide ____________.
22 / 50
------------ is used to read time from RTC
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The keyboard input character scan code is received at ___ port.
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The ______ service # is not used in any interrupt.
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PPI interconnection _______ bits is cleared to indicate low nibble is being sent.
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BPB stands for _________.
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If printer is _____ then printer sends back the ACK signal to the printer interface
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Usually interrupt procedures are reentrant procedures especially those interrupt procedure compiled using C language compiler are reentrant.
29 / 50
In order to produce the sound from PC internal Speaker we have to load the___bit divisor value at the ___port.
30 / 50
In ____________each byte is needed to be encapsulated in start and end.
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32 / 50
There are __________ kinds of serial communication.
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In self test mode the output of the UART is routed to its input
34 / 50
An I/O device cannot be directly connected to the busses so controller is placed between CPU and I/O.
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Which port is known as Data Port______
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Int 14H______ can be used to set the line parameter of the UART or COM port
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____ No. of bytes are used to store the character in the keyboard buffer.
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The service _________ is called the keyboard hook service.
39 / 50
The following command “outportb (0x61,inportb(0x61) & 0xFC);” will
40 / 50
The amount of memory above conventional memory (extended memory) can be determined using the service _______.
41 / 50
DCE is _____________
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The interval timer can operate in _______ modes.
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The bit number _______ of the coprocessor control word is the interrupt enable flag.
44 / 50
NMI Stand for
45 / 50
In case of synchronous communication a timing signal is required to identify the start and end of a bit.
46 / 50
What will be the value of DL register when we are accessing C drive using undocumented service 21H/32H?
47 / 50
The -------- function receive a byte and COM port number is passed as parameter using BIOS service
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The interval timer can operate in ____modes.
49 / 50
Control information in files is maintained using
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______ is used to set time.
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