There is very little documentation (that I am aware of) for this model on the web.

The PDF spec sheet for the K610a is attached to one of my posts above (direct link). It has sizes, the command set, font samples, etc.. everything you need, and it's all that's available AFAIK. One non-obvious note in there is that it runs on TTL-level (0-5v) serial, which is one reason why you need something like foxtrot's board.