It might be a long post, but yeah.

The most important thing to know is that there's a 1 pixel, invisible border around Xterm making the tablet's screensize 798x478.

By simply removing that border, it then gives you a big fullscreen of 80x25 characters on it. The rest is figuring out how to put a touchscreen keyboard on the screen as well, that is, unless you don't need one.

If you really would like ADOM, I can post it later tonight.

In the meantime, this is the script I use to run it:
I'll explain what all that does later unless you already have a good idea.