Exacly what it says on the tin. I've seen VMS used as synonym of VMU in many english sites, including right here on Sega Retro and on the english wikipedia. According to these sources, that is the name of the device in Japan. However, in my research for these things in numerous japanese sites, I've never seen it listed as VMS. Not in the japanese wikipedia, not in Sega's hardware page (even the URL is mocking me), not] in any packaging (neither the Dream Points or the non-standard packaging) and never in any japanese site either. It is always listed as Visual Memory (????????). I know .vms is the extension of the virtual memory save file. I can't shake the feeling that VMS is another myth as the V in VMU meaning virtual was. I'm sorry if it's an ignorant question but it has been bothering me for awhile. So, does anyone know where System or VMS comes from?