There are several applications on Play Store that can run your lovely old dos crap but only two are worth mentioning - Magic Box and DosBox Turbo. The second one comes with laucher and you can run different games with costumised settings just out from the separate laucher application (how cool is that). For that point it's even better than original DosBox designed for PCs when you have to edit config file every single time you want to change some settings. It's really great to play old dos games on your tablet or phone. It's better if you have bt keyboard and mouse paired however mouse functionality is somehow limited due to androind system specification.
As everything that is good on this planet never comes cheap same her - you have to pay for both applications. I think it's something around 3£ now but it's not a lot.