Hmm, its not actually a typing sound I'm after - its the kind of electronic blip you hear when you see this kind of thing done in movies. If i could figure out what exactly was making that sound I may be able to find it. Thought it was a teleprinter but that turns out to have a totally different sound. Its a bit like a dot matrix printer but with the pips more spaced out. Not sure if I'm describing this well enough. Trying to think of a recent film that I could refer to but can't think of one either!