I would strongly recommend that you try your hand at fixing these bugs, because you seem to care about them. That puts you in a much better position to get these bugs fixed than most other people. It also doesn't sound too complex, if it's just a blinking cursor. 1) Figure out how the real hardware did it (could be as simple as a 555 timer) 2) See if there's any code related to this for this machine 3) If yes, fix the code, if no, check how it's implemented for other machines