DOSBox FAQ

Performance

Q. My game runs fine at first then an error message pops up on dosbox saying that the video file format is wrong. How or what can I do to fix this, if there is anything known?

Q. My game/application runs slowly, how do I improve speed?

A. Increase cycles. Use core=dynamic. Try different output modes (e.g. output=overlay). Increase Frameskip. Disable unneeded components in the dosbox.conf such as Sound, mouse or joystick emulation. A nice speedup can be achieved by using a different compiler than GCC. If all else fails, find a faster computer to run DOSBox on.

Also be sure to check the compatibility section of this FAQ as some game/applications are more trouble (or resource hogs) than others.

Q. The Sound/Music for my DOS game/application sounds terrible what can I do?

A. This is a complicated issue covered in the Sound section of the wiki. It's important to remember to install or setup game/applications correctly to use the correct sound devices (INSTALL.EXE, SOUNDSET.EXE and SETUP.EXE are popular program names to look for). The capabilities of the hardware as well as the preferences of the programmer vary: Therefore what may sound "best" on one particular game may not be the "best" for another. Sometimes changes need to be made to the dosbox.conf file (or a new conf file) to get the best results.

Also, game sound/music may have an impact on the speed at which the game/application runs and running DOSBox with limited resources may result in incomplete or 'choppy' sound being heard. (see previous question)

Q. How do I change the memory size so that I can run programs that require more than the default settings (eg. Windows 1.01 or some other demanding OS)?

Usage

Q. My backslash key is mapped to ']' with DOSBox in Vista. Is there a workaround?

A. Press CTRL-F1 to enter the keymapper and select the backslash with your mouse. Press the DELETE button that will show up on your screen. Then press ADD to bind backslash to another key. Simply press an unused key to bind it to this. Press SAVE and then EXIT to return to the main screen.

Q. My cursor is trapped within the DOSBox window when I click inside. How do I get the cursor out?

A. DOSBox will capture your mouse when you click inside the display window (and you have autolock=true set in the Dosbox.conf). Simply press CTRL-F10 to release the mouse.

Q. I have set Gnome to load DOSBox when I click on .COM files. How do I script it to exit DOSBox when I quit from the game?

A. with -exit as commandline parameter for DOSBox.

Q. How do I access my hard drive/cdrom in DOSBox?

A. See the information on the MOUNT command, or type intro mount or intro cdrom in DOSBox for the basics.

Q. I have an ISO image I made of files for backup purposes. How do I access it in DOSBox?

A. See the information on the IMGMOUNT command

Q. How do I unmount or change images? I need to swap CD images in the drive.

A. You don't "unmount", you may assign more than one image file to IMGMOUNT, to swap images use CTRL-F4.

Q. I have created an image from a CD that includes CD audio tracks, when I access it in DOSBox only the first (data) track is available.

A. Be sure to use the bin/cue format for mixed mode CDs (CDs with a data and audio tracks) and always pass the cue file to IMGMOUNT.

Q. I can't find the ":" symbol anywhere in my dosbox. I am using ista on a laptop. Please advice me how to fix the problem.