By running the application via the setup utility, you’re basically making certain that it uses the correct graphics mode. The reason for this is that DOSBox doesn’t always correctly set the graphics mode for a particular application. In order to do this, open up the configuration file, and look for “output,” under the file’s SDL section.įinally, as a general rule, you should run the install file for games that you’re playing in DOSBox (Typically “install.exe” or “setup.exe”). As for the refresh rate and crash issues, try modifying the output from “Surface” to either OpenGL(output=openglnb) or DirectDraw(output=ddraw). You might also notice that the images on-screen look either warped or stretched.Īddressing the ‘distorted images’ issue is pretty simple- simply make certain that aspect ratio correction is enabled. Commonly, you’re going to either notice the game’s having trouble refreshing the display (leading to a number of hangups), or simply crash altogether. Troubleshooting Display Issuesĭue to the difference between older computer screens and modern screens, it’s fairly common for DOSBox virtualization to experience a few display issues here and there. Consider what other programs are running when you open the emulator. If, even with all of the above, you’re still running into frame rate issues, it may well be that your system’s having trouble running DOSBox due to a lack of computing resources. Again, you can change all of this by editing the configuration file (DOSBox Options) as well. Simply type either frame-skip 1 or frame-skip 2. Once you’ve figured out the ‘sweet spot’ for a particular game, you can open up the DOSBox configuration file, and change DOSBox’s configuration file by opening up “Options” in the DOSBox folder, and changing the value you see next to “cycles.”Īlternatively, you can simply keep track of which games require different CPU speeds, and enter in the command “cycles=(value you’re setting the cycles to).” Finally, you can try enabling frame-skip. There are a few ways you can do this- first and foremost, you can try changing the core affinity of either DosBox or the game you’re trying to run to a single processor on multi-core systems. In order to keep a game’s frame-rate at a level that’s manageable for the application, you’re basically going to need to tone down the power of your system. There are a number of reasons that this might happen, but usually it’s because your system is displaying a frame-rate that’s too high for the game to handle- as a result, you get chopping, skipping, and generally poor image quality. Most commonly, you’re going to see some frame-rate issues and graphical glitches. If you’re downloading DOSBox, it’s worth a read.Īnyway, as is the case with most applications- particularly emulation platforms- DOSBox doesn’t work perfectly all the time. cycles=auto 5000 50% limit 50000 - Realmode games run with 5000 fixed cycles, protected mode games with cycles=max 50% limit 50000.Oh, and you should probably give yourself a refresher course on MS-DOS commands- there’s a tutorial notepad file included with the DOSBox install file.Protected mode games run with cycles=max. cycles=auto - Realmode games will run at 3000 cycles.cycles=max 50% - About 50% of your CPU power will be used.cycles=max limit 50000 - All games you start run at up to 50000 cycles, depending on the power of your CPU.Use Ctrl+F11 and Ctrl+F12 to change the percentage of your CPU to be used. cycles=max - All games you start run at the maximum speed your CPU permits.You can change the actual value with Ctrl+F11 and Ctrl+F12 ( keycombo) while DOSBox runs. Useful for speed sensitive games or games that need a continuous CPU speed. cycles=fixed 5000, cycles=5000 - All games you start are run with a fixed speed of ~5 MIPS.When switching to protected mode, cycles is internally switched to max using the remaining optional parameters. For realmode games, this option switches to realmode default number of cycles or 3000 if not specified.
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