[Q] DOS App screen size

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http://forum.xda-developers.com – Hi There: Total newbie here, please bear with me... Apologies if this post is in the wrong place. Similar questions do seem to have been posted here. I have an old DOS program, quite small (1.26 MB), which is a GPS calculator. I want to use it on a small tablet (Nexus 7). I downloaded an app (Aemula), originally for gaming, which allowed me to install a full version of DOS 6.22 in Android. Not just a DOSBox; my program needs full DOS. The shells don't work. This Aemula/full DOS combination works quite well; the program functions normally. But the app screen is small. I've attached (HowTos)