VampiroAlhazred: Hi, Bqw. I have a Nexus 7 too. I'll try to explain you how to make your GOG DOS games run on Android.
Example game: Battle Chess.
1 - Install the game on your PC. Example path: "C:\GOG\BChess"
2 - To play on Android you don't need the windows files, like the uninstaller, icons, documents, etc. So you may delete all those files to save storage space.
3 - Create a folder on your Android device for your DOS games; I named it "DOS".
4 - Copy the "BChess" folder from your PC ("GOG\BChess") to the Android folder ("DOS\BChess").
5 - Install DOSBox Turbo and DOSBox Manager.
6 - Run DOSBox Manager and create a [New Profile] named "Battle Chess". You can [Change Icon] to add the game cover. Then go to [Edit Config] --> [DosBox Settings] --> [Autoexec]. Edit the autoexec.bat to tell the emulator where the game is installed and which is the game executable file:
mount c:/storage/emulated/0/ c: cd DOS cd BChess bc 7 - Enjoy! ^^
I hope this little guide helps. Good luck!
Appending to what the uruguayan vampire said, which is exactly what you should do, here's a small correction and extra info.:
6a On step 6, the line
mount c:/storage/emulated/0/ actually should have a space between c: and /storage, or it won't work. It should read:
mount c: /storage/emulated/0/ The line above means you're telling DOSBox to assign the contents of folder /storage/emulated/0/ to drive C. You need that.
6b Very important, /storage/emulated/0/ should be the path to folder DOS, but that ain't true on all devices. I think it is true in your device though, the Nexus 7.
bqw: I need to know how to set it up...
See above.