Revolution Emulator

The Revolution Emulator (RVL_EMU) was an early Wii devkit setup used in January-February 2006 for early testing of Wii system software, particularly IOS as well as PPC-side software that interacted with IOS. It was not a single device, but an umbrella term for the concept of connecting a GameCube devkit to a Barnacle2 bootrom emulator, a Hudson NNGC drive emulator board to provide Wii drive emulation, and a host Linux PC to emulate IOS through BroadOn's software emulator.
RVL_EMU uses the "WK" and "WKMC" (Waikiki and Waikiki Multi Connect) libraries to communicate with the Linux host.
The BroadOn IOP-OS emulator is a Linux (Fedora Core 3) program which emulates some of IOS' functionality. It was used to test IOS code before the Hollywood was available, along with the Versa board.
RVL_EMU was only released to BroadOn and iRD - as such, it was never used for game development.