When changing lanes on an expressway signal your intentions and?

Why I/O modules is needed between system bus and I/O devices?

beks73 [17]

Answer:

1. Processor communication -- this involves the following tasks:

a. exchange of data between processor and I/O module

b. command decoding - I/O module accepts commands sent from the processor. E.g., the I/O module for a disk drive may accept the following commands from the processor: READ SECTOR, WRITE SECTOR, SEEK track, etc.

c. status reporting – The device must be able to report its status to the processor, e.g., disk drive busy, ready etc. Status reporting may also involve reporting various errors.

d. Address recognition – Each I/O device has a unique address and the I/O module must recognize this address.

2. Device communication – The I/O module must be able to perform device communication such as status reporting.

3. Control & timing – The I/O module must be able to co-ordinate the flow of data between the internal resources (such as processor, memory) and external devices.

4. Data buffering – This is necessary as there is a speed mismatch between speed of data transfer between processor and memory and external devices. Data coming from the main memory are sent to an I/O module in a rapid burst. The data is buffered in the I/O module and then sent to the peripheral device at its rate.

5. Error detection – The I/O module must also be able to detect errors and report them to the processor. These errors may be mechanical errors (such as paper jam in a printer), or changes in the bit pattern of transmitted data. A common way of detecting such errors is by using parity bits.

5 0

3 years ago

A security administrator is required to submit a new csr to a ca. what is the first step?

m_a_m_a [10]

If an administrator needs to renew a certificate for a web server he/she should submit the CSR (Certificate Signing Request) to CA.
If a security administrator is required to submit a new CSR to a CA, teh fisrt step the administrator should do is to generate a new private key based on RSA.

4 0

3 years ago

Write a procedure named Read10 that reads exactly ten characters from standard input into an array of BYTE named myString. Use t

MatroZZZ [7]

Answer:

Following are the solution to the given question:

Explanation:

Since a procedure has the Read10 parameter, the 10 characters from the input file are stored in the BYTE array as myString. The LOOP instruction, which includes indirect addressing and also the call to the ReadChar method, please find the attached file of the procedure:

3 0

3 years ago

In this lab, you will create a programmer-defined class and then use it in a Java program. The program should create two Rectang

prohojiy [21]

Answer:

class Rectangle{

//private attributes of length and width

private double givenLength;

private double givenWidth;

// constructor to initialize the length and width

public Rectangle(double length, double width){

givenLength = length;

givenWidth = width;

}

// setter method to set the givenlength

public void setGivenLength(double length){

givenLength = length;

}

// setter method to set the givenWidth

public void setGivenWidth(double width){

givenWidth = width;

}

// getter method to return the givenLength

public double getGivenLength(){

return givenLength;

}

// getter method to return the givenWidth

public double getGivenWidth(){

return givenWidth;

}

// method to calculate area of rectangle using A = L * B

public void calculateArea(){

System.out.println("The area of the rectangle is: " + getGivenLength() * getGivenWidth());

}

// method to calculate perimeter of rectangle using P = 2 * (L + B)

public void calculatePerimeter(){

System.out.println("The perimeter of the rectangle is: " + 2 * (getGivenLength() + getGivenWidth()));

}

public class MyRectangleClassProgram{

public static void main(String args[]){

//rectangle1 object is created

Rectangle rectangle1 = new Rectangle(10.0, 5.0);

//rectangle2 object is created

Rectangle rectangle2 = new Rectangle(7.0, 3.0);

//area for rectangle1 is calculated

rectangle1.calculateArea();

//perimeter for rectangle1 is calculated

rectangle1.calculatePerimeter();

//area for rectangle2 is calculated

rectangle2.calculateArea();

//perimeter for rectangle2 is calculated

rectangle2.calculatePerimeter();

}

Explanation:

Two file is attached: Rectangle.java and MyRectangleClassProgram.java

Download java

java

7 0

3 years ago

Reference variables allow arguments to be passed by ____________.

son4ous [18]

Answer:

Reference

Explanation:

The Reference type variable is such type of variable in C# that holds the reference of memory address instead of value. Examples for reference type are classes, interfaces, delegates and arrays.

We can pass parameters to the method by reference using ref keyword

It’s mandatory to initialize the variable value before we pass it as an argument to the method in c#

For example,

int x = 10; // Variable need to be initialized

Add(ref x); // method call

If you pass parameters by reference in method definition, any changes made to it affect the other variable in method call.

Here's a sample program:

using System;

namespace ConsoleApplication

{

public class Test

{

public static void Main()

{

int i = 10;

Console.WriteLine("i=" + i);

Add(ref i);

Console.WriteLine("i=" + i);

Console.ReadLine();

}

public static void Add( ref int j)

{

j = j + 10;

Console.WriteLine("j="+j);

}

Output:

i=10

j=20

i=20

7 0

3 years ago