I think the computer is broken in this save, you should try to program it inside the demo save, without deleting anything. As for your assembly code, after removing the string containing a lot of spaces, it prints out hello world. You should add a value of zero after the string to make write_string know where to stop. Also add a hlt (halt) after the function call, otherwise it will start executing the string as code.
Honestly I have no idea why the code doesn't work.. All it is is a Hello World program.. This shows how terrible I am at Assembly.