CS609-Midterm
1 / 50
By cascading two DMAs ____ bits can be transferred.
2 / 50
____ No. of bytes are used to store the character in the keyboard buffer.
3 / 50
The ________function initialize the COM port whose number is passed as parameter using BIOS services.
4 / 50
Display device (Monitor) performs _________ I/O.
5 / 50
______ is LED control byte.
6 / 50
Maximum number of interrupts in a standard PC is
7 / 50
To set the interrupt vector means is to change the double word sized interrupt vector within the IVT.
8 / 50
DTE is ___________
9 / 50
Int 14H __________ can be used to set the line parameter of the UART or COM port.
10 / 50
IVT is a table containing ______ byte entries each of which is a far address of an interrupt service routine.
11 / 50
________means typematic rate will be sent in next byte.
12 / 50
Which port is known as Data Port______
13 / 50
The interval timer can operate in _______ modes.
14 / 50
File can be______ viewed as collection of clusters or blocks.
15 / 50
The bit number _______ of the coprocessor control word is the interrupt enable flag.
16 / 50
------------ is used to set time from RTC
17 / 50
The service number is usually placed in the ________ register.
18 / 50
Which of the following are types of ISR __________.
19 / 50
Hardware Interrupts are __________.
20 / 50
An I/O device cannot be directly connected to the busses so controller is placed between CPU and I/O.
21 / 50
DCE stands for __________.
22 / 50
Timer interrupt is a _________.
23 / 50
The microprocessor package has many signals for data. Below are some in Correct priority order (Higher to Lower).
24 / 50
There are __________ kinds of serial communication.
25 / 50
REGS is a Union
26 / 50
Usually interrupt procedures are reentrant procedures especially those interrupt procedure compiled using C language compiler are reentrant.
27 / 50
Standard PC operates in two modes in terms of memory which are
28 / 50
The following command “outportb (0x61,inportb(0x61) & 0xFC);” will
29 / 50
The PPI acts as an interface between the CPU and a parallel ________ .
30 / 50
Set the Interrupt vector means to change the double word sized interrupt vector within IVT.
31 / 50
Int 14H______ can be used to set the line parameter of the UART or COM port
32 / 50
Interrupt _____ is empty; we can use its vector as a flag.
33 / 50
The following command “outportb (0x61,inportb(0x61) | 3);” will ________ .
34 / 50
In counter register bit no. 3 changes its value between 0 and 1 with in ____clock cycles
35 / 50
Software based flow control make use of -------- control characters
36 / 50
In self test mode the output of the UART is routed to its input.
37 / 50
______ is Disk interrupt.
38 / 50
Interrupt service number is usually placed in ____________ register.
39 / 50
40 / 50
Operating system name contains ____ bytes in boot block.
41 / 50
Int ________ is used to control the printer via the BIOS.
42 / 50
What will be the value of DL register when we are accessing C drive using undocumented service 21H/32H?
43 / 50
44 / 50
The BIOS interrupt 0x1AH can be used to configure real time clock
45 / 50
The bit ______ of Line control register in UART, if cleared will indicate that DLL is the data register.
46 / 50
The keyboard input character scan code is received at ___ port.
47 / 50
The Function of I/O controller is to provide ____________.
48 / 50
The output on the monitor is controlled by a controller called __________within the PC.
49 / 50
50 / 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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