CS609-Midterm
1 / 50
In counter register bit no. 3 changes its value between 0 and 1 with in ____clock cycles
2 / 50
Software based flow control make use of -------- control characters
3 / 50
______ is used to set time.
4 / 50
Interrupt _____ is empty; we can use its vector as a flag.
5 / 50
DMA stands for_________
6 / 50
Timer interrupt is a _________.
7 / 50
Maximum number of interrupts in a standard PC is
8 / 50
The keyboard input character scan code is received at ___ port.
9 / 50
At IRQ 7 Interrupt # ___ is used.
10 / 50
Usually interrupt procedures are reentrant procedures especially those interrupt procedure compiled using C language compiler are reentrant.
11 / 50
DCE is _____________
12 / 50
Int 14H______ can be used to set the line parameter of the UART or COM port
13 / 50
The interval timer can operate in _______ modes.
14 / 50
__________is used to control the printer via the BIOS
15 / 50
File system used in CD’s is_______ file system
16 / 50
The microprocessor package has many signals for data. Below are some in Correct priority order (Higher to Lower).
17 / 50
By cascading two DMAs ____ bits can be transferred.
18 / 50
19 / 50
Timer interrupt occurs _______ times every second by means of hardware.
20 / 50
PPI stands for _____________.
21 / 50
In self test mode the output of the UART is routed to its input.
22 / 50
_________ used to determine the amount of conventional memory interfaced with the processor in kilobytes.
23 / 50
DSR stands for __________ .
24 / 50
___________ is used to identify cause of interrupt.
25 / 50
------------ whenever receive indicates the start of communication ……….. whenever receive indicates the end of communication
26 / 50
The keyboard makes use of interrupt number _______ for its input operations.
27 / 50
DTE is ___________
28 / 50
Interrupt 9 usually reads the _________ from keyboard.
29 / 50
Only ________ ports are important from programming point of view.
30 / 50
Keyboard uses port ____ as status port.
31 / 50
If keyboard buffer is empty the head and tail points at the same location.
32 / 50
An I/O device cannot be directly connected to the busses so controller is placed between CPU and I/O.
33 / 50
In ____________each byte is needed to be encapsulated in start and end.
34 / 50
On the execution of IRET instruction, number of bytes popped from stack is
35 / 50
Control information in files is maintained using
36 / 50
The ____________ function simply enables the self test facility within the modem control register
37 / 50
------------ is used to set time from RTC
38 / 50
Register can be used to divide frequency is _________
39 / 50
Standard PC operates in two modes in terms of memory which are
40 / 50
------------ is used to read date from RTC
41 / 50
Total No. of bytes that can be stored in Keyboard Buffer is____.
42 / 50
Counter register can be used to divide clock signal.
43 / 50
There are __________ kinds of serial communication.
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46 / 50
Display device (Monitor) performs _________ I/O.
47 / 50
BIOS DO NOT support ______.
48 / 50
To set the interrupt vector means is to change the double word sized interrupt vector within the IVT.
49 / 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);
50 / 50
Int 14H __________ can be used to receive a byte.
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