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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
Define Pure Virtual Function? Why & when it is used?
Mixed Mode Expressions and Implicit type Conversions A mixed mode expression is one in which the operands are not of the similar type. In this case, the operands are converted
Is computer an intelligent machine?
Step 1 Define the program headers and the variables #include #include #include #include void main() { char prompt; float a,b,c,d,e; floa
Write a function that takes in a number n and divides the screen into n vertical bars, alternating black and white. (What should you do if someone puts in n=0 or n=-99?)
Byteland county is very famous for luminous jewels. Luminous jewels are used in making beautiful necklaces. A necklace consists of various luminous jewels of particular colour. Nec
A string S is said to be "Super ASCII", if it contains the character frequency equal to their ascii values. String will contain only lower case alphabets (''a''-''z'') and the asci
Ask question #Minimum 100 words acceptedEducational Objectives: After completing this assignment, the student should be able to accomplish the following: Apply generic algorithms i
Your task in this project is to write a C program named layout.c which does text layout. This is a staged project, complete the stages in order. The maximum mark if you nish each
The video game machines at your local arcade output coupons depending on how well you played the game, you can redeem 10 coupons for a candy bar, 6 coupons for .a medium soft drink
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