Yes. The default folder is "roms" which MAME will look for under, from where it was executed. So if mame64.exe is executed (started) in S:\MyEmulators\MAME\, it will look for the rom files in S:\MyEmulators\MAME\roms\
Yes. The default folder is "roms" which MAME will look for under, from where it was executed. So if mame64.exe is executed (started) in S:\MyEmulators\MAME\, it will look for the rom files in S:\MyEmulators\MAME\roms\