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BC (short for Backwards Compatibility) is a bootloader similar to boot1 and boot2 that is responsible for verifying and loading MIOS. It is run when a GameCube game is launched from the Disc Channel. It is unknown why this is separate from MIOS.
|version||length||build tag / date||notes|
|0||0x41be||Aug 11, 2006*||corresponds with boot1a?|
|1||0x412a||Sep 2, 2006*||corresponds with boot1b?|
|4||0x4d8c||bc.0803040819||corresponds with boot1c?|
|6||0x502c||bc.0908240243||corresponds with boot1d?|
*No build tags are included with early versions of BC, so approximate dates are listed from corresponding MIOS. These dates are likely very close (If not identical) to the actual BC build dates.