Program to calls to echo the typed characters, C/C++ Programming

Assignment Help:

Write a main program that uses these system calls to echo the typed characters. The pseudo code will look something like:

void traphandler ()  {

   if (R0 == 0) { // read system call

      R1 = getchar(); // poll the status register of the IO terminal until a char is available then load it into R1

   } else if (R0 == 1) { // write system call

      putchar(R1); // just store R1 to memory location 0xfff0

   }

   enableInterrupts();

}

void main() {

   char c;

   while (1) {

      c = read();  // set R0 to 0 can issue the 'trap' instruction, result will be in R1

      write(c);  // set R0 to 1 and set R1 to 'c' and issue the 'trap' instruction

   }

}


Related Discussions:- Program to calls to echo the typed characters

Menus, create a shopping cart in c++

create a shopping cart in c++

How to create a data file, How to Create A Data File? A data file shoul...

How to Create A Data File? A data file should be created before it can be processed. A stream-oriented data file is able to be created in two ways. One is to create the file st

Project of result management system in c language, how we write decision ta...

how we write decision tables, flowcharts,pseudocode,and algorithm in result management system

Program for hangman game problem, Program for Hangman Problem   #inclu...

Program for Hangman Problem   #include   #include   #include   #include   #include   static void playGame();   static void printMistakes(int n);   st

Define passing by reference?, A: Method of passing arguments to a function ...

A: Method of passing arguments to a function that takes parameter of type reference.  for instance: void swap( int & x, int & y ) { int temp = x; x =

Program, Write a ‘C’ program to accept any 3 digit integer number from the ...

Write a ‘C’ program to accept any 3 digit integer number from the keyboard and display the word equivalent representation of the given number.

Program is to append the contents of one file to another, Program is to app...

Program is to append the contents of one file to another: void main()    {   clrscr();   fstream file1,file2;   char st1[13],st2[13];/* 13 because a filename canno

UltimateCarRadio Project, In this assignment, you will be modifying your As...

In this assignment, you will be modifying your Assign-05 code to use more inheritance. As well, in this assignment, you will be asked to use newand delete, throw and catch except

C program to print character array, Program to print character array : ...

Program to print character array : Write a program to print the character array by using string class functions. void main() {  char line[30];   int i=0;   clrsc

Procedure to add two numbers in a recursive manner, (a) Write a procedure c...

(a) Write a procedure called (add x y) that adds two numbers in a recursive manner. Specifically, note that x + y = (x + 1) + (y - 1) and x + 0 = x. (b) Using the substitution m

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd