http://pupnik.de/dosbox.html
There's everything you need: the dosbox deb installer, the xkbd deb installer, the ruby repository and the rubybox installer.
Install XKBD first http://pupnik.de/xkbd_0.8.15m-2_armel.deb, than DOSBOX http://pupnik.de/chinook/dosbox_0.72-0.2_armel.deb.
To use Rubybox to configure Dosbox you have first to add this repository http://gronmayer.com/it/dl.php?id=216 to your application manager, then by installing RUBYBOX http://pupnik.de/rubybox_0.3.3.deb every file needed will be downloaded automatically.

I forgot to tell you: browsing this page with you NIT will make things really easy, you will have just to click on the links I posted with you stylus