do you know how to read?
so read documentation

This can be found in the redme file.
what you will want to do though is run DosBox with the -fullscreen switch.

c:\DOSBox-0.62\dosbox.exe -fullscreen

Alt + Enter goes fullscreen

Robertmo... how come you were sarcastic about it? It would been so much easier to just type "alt+enter" and end your post. You woulda saved yourself some time and helped this here fella.

It would NOT been so much easier. if he doesn't read what he should he would flood the forum with 100 other silly questions, and more serious bug raports.

*chuckles* FLOOOD