Thanks a lot, the problem is solved using a single command KEYB US in dos box conf file...
But then I get into a differnete and more puzzling problem. The sim now works perfectly, but every time I get in contact with the enemy AFTER receiving some damages, the keyboard stops working, not completely, since I still can use the arrows and some commands like isner or delete, but the all the other keys (map, rotor, external views, fire, changing weapons, and so on) stop working. This is very strange and happens in two different systems... any idea?
And again, thanks a lot for your time, gentlemen.