Basically all of the commands for Mess are the same. You can find out what the options are for each emulator by using the -listmedia switch. "C:\Users\Asus Laptop\Desktop\Mess\mess0151b_64bit\mess64.exe" -listmedia > "C:\Users\Asus Laptop\Desktop\Mess\ListMedia.txt"The above command will divert the output from the command window into a text file on my desktop named listmedia.txt. You will need to use your path to mess, and to where you want the file to be written. This Page will give you general options such as -nowindow, and -joystick. A typical command for Mess may look like: mess.exe a2600 -cart "[ROMPATH]\[ROMFILE]" -joystick -nowindow The only other thing that you need to do is to have the correct bios for each system. I believe that the bios files go in the Mess\Roms folder.