See this page:
https://github.com/retropie/RetroPie-Setup/wiki/PC
And the links under the tutorials route to a really useful blog that lays out how to use dos games on the pi.
See this page:
https://github.com/retropie/RetroPie-Setup/wiki/PC
And the links under the tutorials route to a really useful blog that lays out how to use dos games on the pi.