Every single ZIP file contains all the files needed to run that specific version of the game. These take up the most storage space but are the easiest to manage individually.
Apply a "CRT" or "Scanline" shader in your emulator settings. This replicates the warm look of old arcade monitors and masks the harshness of low-resolution pixels on modern 1080p or 4K mobile displays. mame roms pack high quality full zip android