EEPROM [Hack64 Wiki]

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====== EEPROM ======

Kirby 64 uses a 512 byte EEPROM chip to store save data.
Software mirrors of the data are kept at 0x800EC9F8 and 0x800ECBB0 in RAM.

===== High level structure =====

^Offset^Size^Description^
|0x000|0x0C|Header|
|0x00C|0x04|Header checksum|
|0x010|0x54|File 1 data|
|0x064|0x04|File 1 checksum|
|0x068|0x54|File 2 data|
|0x0BC|0x04|File 2 checksum|
|0x0C0|0x54|File 3 data|
|0x114|0x04|File 3 checksum|

Checksums are generated by adding the sum of all the 32-bit words in a section to 0x97538642. The function that performs this operation is at 0x800B8F34.

===== File structure =====

^Offset^Type^Description^
|0x0|u32|Latest Unlocked World|
|0x4|u32|Latest Unlocked Level|
|0x8|u32|Unknown|
|0xC|u32|Number of Cutscenes Watched|
|0x10|u8|Percentage Complete|
|0x11|u8|Sound Setting (0 for stereo, 1 for mono)|
|0x12|u8|HUD Display Option|
|0x13|u8|Unknown|
|...|...|...|
|0x18|u16|100-Yard Hop Record|
|0x1A|u16|Bumper Crop Bump Record|
|0x1C|u16|Checkerboard Chase Record|
|...|...|...|

===== Debug Cheat Code =====
It is possible to get a file with 100% completion using the function at 800BA5C4 with A0 set to the file you want to complete. This can be done in the vanilla game using a cheat code.
Requirements:
  * A second controller
  * File 2 must be deleted
  * File 3 must be initialized (but not yet started)
Steps:
  * Reset the game
  * Wait until the HAL Laboratory logo shows up
  * Hold L on the second controller
  * Press the button combo: C-up, C-up, R, C-right, C-left, Start.
  * File 3 should be 100% completed now.
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