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[Eagle of Fire]

If you bother to read readme.txt, you can easily find this:

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5. Special Keys:
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ALT-ENTER Switch to full screen and back.
ALT-PAUSE Pause emulation (hit ALT-PAUSE again to continue).
CTRL-F1 Start the keymapper.
CTRL-F4 Change between mounted disk-images. Update directory cache for all drives!
CTRL-ALT-F5 Start/Stop creating a movie of the screen. (avi video capturing)
CTRL-F5 Save a screenshot. (PNG format)
CTRL-F6 Start/Stop recording sound output to a wave file.
CTRL-ALT-F7 Start/Stop recording of OPL commands. (DRO format)
CTRL-ALT-F8 Start/Stop the recording of raw MIDI commands.
CTRL-F7 Decrease frameskip.
CTRL-F8 Increase frameskip.
CTRL-F9 Kill DOSBox.
CTRL-F10 Capture/Release the mouse.
CTRL-F11 Slow down emulation (Decrease DOSBox Cycles).
CTRL-F12 Speed up emulation (Increase DOSBox Cycles).
ALT-F12 Unlock speed (turbo button).

(NOTE: Once you increase your DOSBox cycles beyond your computer's maximum
capacity, it will produce the same effect as slowing down the emulation.
This maximum will vary from computer to computer.)

[Smiling Spectre]

And do not forget to do setup.exe before start main game. If you want sound, of course.