Great Teacher !!How to mount in dosbox ?

Answer 1

mount the DOSGAMES folder as a virtual hard drive. Double-click the DOSBox executable in your Start menu, and when you see a black box with a Z:\ prompt, type the following command: mount c c:\dosgames. That tells DOSBox to treat the C:\DOSGAMES folder as the root C:\ drive. 

To get to your new C:\ drive (or any drive, for that matter), simply type c: at the Z:\ prompt. This action will put you in the C:\ drive (which is actually C:\DOSGAMES), and from there you can navigate to any of your game directories by typing cd followed by the folder name. CD stands for “change directory,” and you can use it to navigate to any directory on your hard drive.

Answer 2

https://m.youtube.com/watch?v=S-OPdhbSjVM

this might help too