Gog uses dosbox for running ultima, that’s why there is dosbox folder. Copy installation folder to your tablet. Then, inside this folder is dosbox config file. Open it and under [autoexec] section are commands what must be applied to magic dosbox, but with fixed paths, based on your tablet. If there are common autoexec commands then is not necessary use mDosbox’s expert settings, is enough setup everything through GUI. Are you familiar with dosbox config?