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

C program to construct a structure , c program to construct a structure: ...

c program to construct a structure: struct sensus                 {                                 char name[30];                                 long int population;

Explain the bit wise operations, Explain the Bit Wise Operations? C lan...

Explain the Bit Wise Operations? C language in particular was created to make it easier to write operating systems. The objective was to have a language that provided excellent

What is the real function of class - to export data, What is the real funct...

What is the real function of class - to export data? No, Real purpose of a class isn't to export data. Instead, it's to provide services. Class provides a way to abstract behav

Define the modulo division operator in c language, Define the Modulo Divisi...

Define the Modulo Division Operator in c language? The C provides one more arithmetic operator % called as modulo division operator and this operator yields the remainder of an

Programing solution, write a program that declares and initializes 2 intege...

write a program that declares and initializes 2 integer variable a and b with the value 35 and 14, and displays and calculates their sum,product,quotient and real division result.t

Arrays, how to avoid duplicates strings in an array

how to avoid duplicates strings in an array

Build a standalone module to extract and parse, A skilled programmer is req...

A skilled programmer is required to build a standalone module to extract, parse and store in database tables, word count data from web pages and RSS feeds. The module will take

Object oriented programming, implementation of the power and factorial in p...

implementation of the power and factorial in programs

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