"Keep correct aspect ratio" is checked, so it should work. Note that this doesn't mean 4:3. It means whatever ratio is correct. Some games are not 4:3. (Jazz Jackrabbit for example is 16:10.)

You should also probably select openglnb instead of surface as the "render" option. Surface can be slow with aspect ratio correction.

Quite a lot of games are actually 16:10, for example all those that run with an original resolution of 320x200 or 640x400.

Only 320x240 or 640x480 (etc.) would result in a 4:3 aspect ratio.

Yesterplay80 wrote:

Quite a lot of games are actually 16:10, for example all those that run with an original resolution of 320x200 or 640x400.

Only 320x240 or 640x480 (etc.) would result in a 4:3 aspect ratio.

The CRT will stretch 640x400 to full height. So 320x200 and 640x400 are also 4:3. Jazz Jackrabbit uses 320x199 as a trick to get 640x480@60Hz with a huge black bar at the bottom, which is what gives it a 16:10 ratio. Note that the black bar is being cropped out in dosbox, but the aspect ratio is correct (basically the game is zoomed-in, which is what you normally want: no black bars.)

realnc wrote:

The CRT will stretch 640x400 to full height. So 320x200 and 640x400 are also 4:3.

They are still 16:10, it's just the CRT that squashes the image into a 4:3 aspect, isnt't it?

Yesterplay80 wrote:

realnc wrote:

The CRT will stretch 640x400 to full height. So 320x200 and 640x400 are also 4:3.

They are still 16:10, it's just the CRT that squashes the image into a 4:3 aspect, isnt't it?

Yep. That's what they call "non-square pixels". The aspect ratio you're supposed to get is 4:3 and that's what the game was designed for, but the pixels are not square anymore. If you display that on an LCD with integer scaling you get square pixels instead, an aspect ratio of 16:10 and the game will look squashed vertically (stretched horizontally.)

Back in the days Monitors had an aspect ratio of 5:4
I just want the game scaled in 5:4 on a 16:10 Screen.
In this case there are black scales on the left and the right side of the screen. Its not about the native aspect ratio like 320×200=16:10
I want a 5:4 aspect ratio on a modern 16:10 screen with black scales made with D-Fend Reloaded.

What setting do you recommend with D-Fend Reloded?

braindead wrote:

Back in the days Monitors had an aspect ratio of 5:4

5:4? That was just a phase with early 1280x1024 LCD monitors (between the year 2000-2005.) VGA monitors were never 5:4, they were always 4:3.