This is a project that I didn't really get a chance to polish up, I'm just too swamped with other things, and I thought that other people might even have the experience to take the idea and make it more complete. The basic idea is to interface the TEK4010 graphic terminal emulation that can be found in (at least) Tera Term. With this, you can make graphic designs and text and also use a mouse to collect XY coordinates and process them. It uses only the existing serial port so requires nothing more than a serial terminal program with TEK4010 emulation, and an Arduino. I dug around and found a very traditional vector font set, the Hershey set.
I apologize in advance if it doesn't seem obvious how to install it, but all the files are here. I'll try to fix any problems that come up. As I said, it is more a proof of concept and demo than a mature program but I thought it was too interesting to sit on forever.
tek4010_test18.ino (8.71 KB)
vt100.h (2.42 KB)
hersheyPROGMEM.h (35.9 KB)