vu cs201 Mid Term Subjective Solved Past Paper No.9

vu cs201 Introduction to Programming Solved Past Papers

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Question 1: Explain FIFO Queue in UART.
Answer:
This feature is available in the newer version of the UART numbered 16500. A queue or a buffer of the input or output bytes is maintained within the UART in order to facilitate more efficient I/O. The size of the queue can be controlled through interrupt ID register. slide.
Question 2: For what purpose the port 61H is used
Answer:
The port 61h is used to control the speaker only the least significant 2 bits are important. Bit 0 is used to connect the interval timer to the speaker and the bit #1 is used to turn the speaker on off. Rest of the bits are used by other devices.
Question 3: ICW and OCW stand for?
Answer:
Initialize control words, operation control words
Question 4: What is the usage of Interrupt ID Register within the UART?
Answer:

Once an interrupt occurs it may be required to identify the case of the interrupt. This register is used to identify the cause of the interrupt.

Interrupt ID Register

0 bit for Trigger Triggered
2 1 bits for Modem/Line
00 = Change in Modem Status
01 = THR is Empty
10 = Data is Ready
11 = Error in Data
Question 5: Write a function which fills the whole screen with blanks (space).
Answer:
unsigned char far *scr= (unsigned char far*)0xb8000000
void main() {
int i;
for (i=0; i<2000; i++) {
*scr=0x20;
*(scr+1)=0x07;
scr=scr+2;
}
}
Question 9: What do you know about vital rates?
Answer:

Vital rates means death rates and founding rates. This is not only true for the study of large organizations but also of entrepreneurship and small businesses. Following to be learn:

  1. Role of competition
  2. Institutional constraints
  3. Role of government

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