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No documentation, imagine! The original designers–dead. This person had to reverse engineer every aspect of that system, though I can’t imagine that it has more than, say, 64KB of RAM. Still an enormous amount of work but not like trying to figure out how an iPhone works without any documentation.
We’ll surely get faster. Remember that Voyager 1 actually made a pass around one of the planets (Jupiter?) specifically to slow it down so that it could start gathering data. It would not be (relatively speaking) hard to send something out at a far greater velocity.