The aspect ratio is set through the emulators resolution setting. Jzintv has a command switch for this. The command and its switches should be here.
Is there a way to tell the emulator to output in 4:3 instead of 16:9? I don't want to change the output of the RPi, because I still want the front end to be in 16:9. I just want the emulator to play in the original screen ratio.
Here is an example.
jzintv="/opt/retropie/emulators/jzintv/bin/jzintv -v1 --kbdhackfile=/opt/retropie/emulators/jzintv/hackfile.cfg -z1440x1080,8 -f1 -q %ROM%"
You have to edit emulators.cfg with a text editor. Either plug a usb keyboard into the ultimate flashback or connect through the network from another PC.
Edited by mr_me, Mon Jul 25, 2016 9:23 PM.