I am using a tri-sync monitor which has 3 modes 15-24-31khz.
It's a toshiba monitor which is present in the New Net City cabinet, I don't have it's specs so I use Tri-Sync monitor chassis presets for the range.
Since I don't have much room in my flat I have decided to stick with horizontal screen to play even vertical games. So I decided to use the preset fixed horizontal monitor.
Everything works great under Groovymame, but the problem I have is vertical games don't stay at 15khz.
I have an osd panel to change the screen size but the matter is it switches to 24khz ou 31khz so it doesn't look right.
I have found another thread with crt_range settings, where Calamity pointed it's possible to create a vertical.ini file to set limits but I couldn't get it to work maybe because I have 3 crt_range lines ?
I would like some help to figure out a solution to make vertical games stay at 15khz and fill my screen without messing with other games.