The System 357 was essentially a heavily modified embedded inside an arcade chassis. It was the same hardware powering Tekken 6 and Tekken Tag Tournament 2 in arcades. Because the hardware was so specific and the game was a Japan-exclusive arcade release, the "ROM" (the game data) was incredibly difficult to extract and emulate.

If you manage to find a Dragon Ball Zenkai Battle Royale ROM online (and beware: search engines are flooded with viruses masquerading as this file), here is the checklist to see if it actually works:

Arcade preservationists and emulation developers have successfully bypassed the System 357 security measures using two primary methods: