Thank you for your responses, and I know different games switch dynamically its resolutions for certain modes and effects and MAME has to support the lowest multiply of every possible resolution the system uses but what I am asking here is: Is there anyway (no matter if its a source edit) that I can force MAME to only pick the 256x224 resolution on the SNES driver? its because the games I play I know certainly doesn't change this resolution as other do...
I was trying to limit the resolution selecting routine but got lost on the source since I couldn't understand the ppu code...