Write a program that counts from 0 to 99 and prints these numbers to the terminal ie it prints 00, 01, 02, 03, 04, 05, ....,99.

Graphics

1. Write a program in rPeANUt that fills the graphics display with white and then halts.

Interrupts

1. Write an interrupt handler for the trap instruction that outputs to the terminal the string 'trap'. In the main program call this trap in an infinite loop.

2. Modify the handler for the trap instruction such that it implements the system calls 'read' and 'write'. The 'read' system call will read a single character from the terminal (make it blocking), the 'write' system call will write a single character to the terminal. Use register R0 for telling the handler which system call it is (say if the value 0 is in R0 then it is the 'read' system call, and if the value 1 is in register R0 then it is the 'write' system call). Also in the case of 'write' use register R1 to store the character to be written. In the case of 'read' use register R1 for the place the read character is returned.

 

 

Posted Date: 3/8/2013 6:24:56 AM | Location : United States

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