Thus, when a user searches for the "Arcade" variant, they aren't looking for a MAME ROM. They are looking for a modified XBLA package that strips away modern convenience (save states, rewind) to recreate the immediacy of a public arcade challenge.
When Microsoft patched the JTAG exploit, hackers developed RGH. This involves glitching the CPU's reset line at boot-up to trick it into running unauthorized code. RGH works on nearly all Xbox 360 models (Phat, Slim, Trinity, Corona).