First post, by Tertz
In 720x400 mode in fullscreen the apect ratio of 640x400 (VGA 320x200 with scaler=normal2x) image keeps narrower, but not at full area of the screen despite setting apect=true (with apect=true it becomes even more narrower). Tryed 0.74, fresh SVN, different output=opengl, overlay, etc.
While aspect ratio of 640x400 showing at window mode in 720x400 with aspect=true is correct. If full screen only this problem exists.
Outside of DOSBox 720x400x70 Hz fills all screen area. In DOSBox at fullscreen the monitor confirms it is switched in 720x400x70 Hz.
Where it's needed. Many IPS LCD have 60 Hz at 1920x1080 but at 720x400 (this mode can be created in video driver settings) they allow 70 Hz. VGA had 70 Hz, hence games may work at native 70 Hz on them without problems of droped frames or wrong speed. I tested on CRT in 720x400x70 Hz but DOSBox should behave similar with those IPS LCD.
For testing as VGA game may be used Hocus Pocus Shareware or Quake 1.06 Shareware