XyWrite documentation (Mostly XyWrite III+)

XyWrite as delivered by the factory is notoriously under documented, particularly with regard to some implementation notions (such as 3 byte encoded data characters) that one really needs to understand to use XyWrite well. Over time, Herbert Tyson's superb "XyWrite Revealed" book, and a number of excellent notes by Carl Distefano and Robert Holmgren have been extremely useful in filling the documentation void.

I have been working on my own set of notes concerning these implementation details. My notes differ considerably in approach from Tyson's, Distefano's, and Homgren's works in that they attempt to rationalize how and why things in the implementation got to be the way they are. For me, and presumably some readers who are like me, a how-it-got-that-way approach makes things easier to understand and remember. Other will no doubt find the prevailing Tyson/Distefano/Homgren works more to their liking. Some may find value in reading both