BC

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 history

version	length	build tag / date	notes
0	0x41be	Aug 11, 2006*	corresponds with boot1a?
1	0x412a	Sep 2, 2006*	corresponds with boot1b?
2	0x414c	bc.0611021443
4	0x4d8c	bc.0803040819	corresponds with boot1c?
5	0x4f08	bc.0806101038
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.