CARD

BIOSF_CRDACCESS ($C00468): Perform memory card operation
Warning: register contents aren't preserved ! (Uses D0, D1, and A0)

(Informations provided by User:Smkdan)

Memory locations used:

BIOS_CRDF      (8bit): function to perform when calling BIOSF_CRDACCESS, see below table BIOS_CRDRESULT (8bit): 00 on success, else 80+ and encodes the error, see below table BIOS_CRDPTR    (32bit): pointer to read from/write to BIOS_CRDSIZE    (16bit): how much data to read/write from/to card BIOS_CRDNGH    (16bit): usually game NGH. Unique identifier for the game that 'owns' the save file BIOS_CRDFILE   (16bit): each NGH has up to 16 save 'files' associated with

To access memory card, the RAM addresses above must be set depending on the function being attempted BIOS_CRDF values:


 * $00 (Format)
 * No extra parameters


 * $01 (Find)
 * In: BIOS_CRDNGH: NGH to find save files for
 * Out: BIOS_CRDFILE: 16bit mask containing 1 bits for each one of the 16 save files if present.
 * 0 bits mean the save file is not present. i.e. FFFF = all 16 saves used, 8000 = only save file 15 is used


 * $02 (Load)
 * In:
 * CRDPTR: pointer to store loaded data to
 * CRDSIZE: the max size of data to load (automatically stops when entire file is loaded)
 * CRDNGH: NGH of file
 * CRDFILE: the file # of the given NGH to load from


 * $03 (Save)
 * In:
 * CRDPTR: pointer to read data to store to the card
 * CRDSIZE: size of data to save
 * CRDNGH: NGH of file
 * CRDFILE: the file # of the given NGH to save as


 * $04 (Delete)
 * In:
 * CRDNGH: NGH of file
 * CRDFILE: the file # of the given NGH to delete


 * $05 (GETNAME)
 * Gets name of a save file, forgot how these work...


 * $06 (SETUSER) (the username of the card)
 * $07 (GETUSER)

Errors may occur and the BIOS will store a value in BIOS_CRDRESULT depending on what went wrong:
 * $00: no errors
 * $80: no card inserted
 * $81: card inserted, but not formatted
 * $82: attempted to load a file that doesn't exist on the card
 * $83: checksum error?
 * $84: attempted to save to a full card
 * $85: card write protect switch is active