From Rare Gaming Dump
Minnow is a GameCube prototype board created in between the Arthur board and HW1, sometime in 1999. Little is known about it. At one point in the SDK it was referred to as MINNOW_MARLIN before being changed to MINNOW; MARLIN is believed to refer to a component of the GameCube's optical disc drive emulation system for devkits.
See OSGetConsoleType for more information.