I've taken an interest in this little guy recently and I've managed to
   find a fair bit of information in the form of retrospectives and a few
   academic papers, but nothing more technical. Considering it's been
   defunct for decades I'm surprised datasheets and manuals aren't easier
   to find online (or maybe it's just me?). Does anybody happen to know
   if/where any such material can be found?

   Thanks.