CS609-Midterm
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Only ________ ports are important from programming point of view.
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------------ whenever receive indicates the start of communication ……….. whenever receive indicates the end of communication
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Register can be used to divide frequency is _________
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The interval timer can operate in ____modes.
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By cascading two DMAs ____ bits can be transferred.
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To store each character in keyboard buffer ____ bytes are required.
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_____ bit is cleared to indicate the low nibble is being sent.
8 / 50
PPI stands for
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The following command “outportb (0x61,inportb(0x61) | 3);” will ________ .
10 / 50
The ________function initialize the COM port whose number is passed as parameter using BIOS services.
11 / 50
The keyboard makes use of interrupt number _______ for its input operations.
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The interval timer can operate in _______ modes.
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PPI interconnection _______ bits is cleared to indicate low nibble is being sent.
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The -------- function receive a byte and COM port number is passed as parameter using BIOS service
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DMA stands for_________
16 / 50
Software based flow control make use of -------- control characters
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There are two type of communication synchronous and Anti Synchronous
18 / 50
Which port is known as Data Port______
19 / 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);
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22 / 50
The PPI acts as an interface between the CPU and a parallel ________ .
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The BIOS interrupt 0x1AH can be used to configure real time clock
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Interrupt 9 usually reads the _________ from keyboard.
25 / 50
In counter register bit no. 3 changes its value between 0 and 1 with in ____clock cycles
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On the execution of IRET instruction, number of bytes popped from stack is
27 / 50
Usually interrupt procedures are reentrant procedures especially those interrupt procedure compiled using C language compiler are reentrant.
28 / 50
Keyboard uses port ____ as status port.
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BIOS support _____________UARTS as COM ports.
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31 / 50
In ____________each byte is needed to be encapsulated in start and end.
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If we want to produce the grave voice from speaker phone then we have to load the ____ divisor values at Port ____.
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BPB stands for _________.
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The keyboard input character scan code is received at ___ port.
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Int_____________ service 0 can be used to set the line parameter of the UART or COM port.
36 / 50
DSR stands for __________ .
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To distinguish 486 with Pentium CPUID Test is used.
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The Function of I/O controller is to provide ____________.
39 / 50
Bit number _______ of coprocessor control word is the Interrupt Enable Flag.
40 / 50
Int 14H __________ can be used to set the line parameter of the UART or COM port.
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The amount of memory above conventional memory (extended memory) can be determined using the service _______.
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The service _________ is called the keyboard hook service.
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DCE is _____________
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There are two main types of interrupts namely _________________.
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In case of synchronous communication a timing signal is required to identify the start and end of a bit.
48 / 50
A software interrupt does not require EOI (End of interrupt).
49 / 50
Operating system name contains ____ bytes in boot block.
50 / 50
The following command “outportb (0x61,inportb(0x61) & 0xFC);” will
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