Is the entire screen in DOS mode or jus a window opened as a DOS mode ?? (like say command prompt window) ?
Neways... hv u tried the Printscreen option or Alt+printscreen combo for the same ??
a few options.
1.) 2 possibilities:
A. Run in a DOS window, then use the Print Screen! i.e
You must have the DOS (or say a C/C++ user screen) in "windowed" rather than full-screen mode (hit ALT-Enter to switch back and forth b/w windowed and full screen mode).
Then hit the PrintScreen key, and open a program like Paint, then click Edit => Paste to paste the screenshot.
B. Download a DOS screen grabber utility, e.g. from here:
http://www.3dgamers.com/utils/
alternatively,
2.) Irfanview has a Hotkey function, which can save a captured image as any file type you can imagine, at your command, or at pre-determined intervals.
now,
3.) if your using DOSBox, you can press CTRL-F5 to save a screenshot.