Jesse aka Tablebeast has done a wonderful thing by posting a link on the Benders list to a collection of Vintage Casio keyboard manuals. They include the owner’s guides for SK-1, SK-5, SK-8, and DM-100. The SK-1 service manual aka the Bible is also there. Very neat to look at, although I am a little puzzled about the addition of the Tablebeast Modification pages in the PDFs. At this point they seem to contain nothing. At any rate, grab them while you can.