getslot: Add GETSLT: Get slot ID of any page article. It is quite a commonly used routine, but the examples in the official documentation are often hard-coded for page 1 and need to be adapted by the programmer if they need a different page. This implementation works for all pages, and also includes a detailed explanation.
resources: Add a few translated sections of the R800 User’s Manual. Source images posted on Twitter by Japanese MSX user Kinnoji: https://twitter.com/v9938 https://twitter.com/v9938/status/1124223395141308417 https://twitter.com/v9938/status/1124296770270351360