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First post, by tegrady

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So, I'm having a strange issue with DOSBox. It has been running fine in full screen for years. However, suddenly today it won't go full screen. I haven't changed any software today that I can think of that would have affected it.

When I hit Alt-Enter, the screen goes black as if it is going full screen, then it immediately goes back to the Windows desktop and DOSBox is still open, but in a window.

I also tried starting DOSBox in full screen mode, but that doesn't work either. It does the same thing noted above.

I am using version 0.74-3. (I tried version 0.74 and 0.74-2 as well, but no change). I also uninstalled and re-installed DOSbox, but no change.

Here is the relevant part of my conf file:

fullscreen=true
fulldouble=true
fullresolution=800x600
windowresolution=original
output=opengl
autolock=true
sensitivity=100
waitonerror=true
priority=higher,normal
mapperfile=mapper-0.74-3.map
usescancodes=true

I of course updated my video drivers and restarted Windows just to see if that would fix it, but no change.

My computer's specs: WIndows 10 Pro (64-bit) ver 2004, 32gb RAM, i7 8700k, Nvidia RTX 2080ti (latest drivers as of today).

I Googled the problem and did not find any answers that fixed the issue.

Thanks in advance.

Reply 1 of 3, by DosFreak

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Try closing all open programs including anything in the system tray. If that works then you'll need to see which one is causing the issue.

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Reply 3 of 3, by BardBun

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Just to improve on your DOXBox experience, use these resolutions for when you play:

output=openglnb
aspect=false

Games with 320x200 native resolution

For a 1920x1080 Monitor:

fullresolution=1920x1000
windowresolution=1280x800

For a 2560x1440 Monitor:

fullresolution=1560x1400
windowresolution=1280x800 or 1600x1000

For a 4K Monitor:

fullresolution=3840x2000
windowresolution=1280x800 or 1600x1000 or 1920x1200

Games with 640x480 native resolution:

For a 1920x1080 Monitor:

fullresolution=1920x960
windowresolution=1280x960

For a 2560x1440 Monitor: (scales up perfectly to 1440p)

fullresolution=2560x1440
windowresolution=1280x960

For a 4K Monitor:

fullresolution=3840x1920
windowresolution=1280x960 or 1920x1440

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If your Monitor is 1920x1080, typing in 1920x1000 causes the game to be centered as 1600x1000 with black bars around, your monitors resolution will still say 1920x1080.
Making it also ideal to record using things like OBS, in this case the canvas area should be 1600x1080 and the video uploaded with black bars for sharp pixels. (only red pixels will appear washed out due to video compression)