CARD

CARD ($C00468)

The CARD system ROM call is used to perform operations on the memory card.

Warning: register contents aren't preserved !

Variables

The following variables are used when calling CARD:

Address	DEF name	Size	Set by	Description
$10FDC4	BIOS_CARD_COMMAND	byte	System ROM or game	Command code to execute
$10FDC6	BIOS_CARD_ANSWER	byte	System ROM	Answer code (see below)
$10FDC8	BIOS_CARD_START	longword	System ROM or game	Pointer to data
$10FDCC	BIOS_CARD_SIZE	word	System ROM or game	Size of data
$10FDCE	BIOS_CARD_FCB	word	System ROM or game	Game NGH number
$10FDD0	BIOS_CARD_SUB	byte or word	System ROM or game	Game save sub-number

The following temporary variables are used when calling CARD :

Address	DEF name	Size	Description
$10FD04	BIOS_CARD_DIRECTORY_START	long word	Start of directory
$10FD08	BIOS_CARD_BLOCK_NUMBER	word	Number of blocks
$10FD0A	BIOS_CARD_FAT_START	long word	Start of FAT
$10FD0E	BIOS_CARD_FAT_SIZE	word	Size of FAT
$10FD10	BIOS_CARD_DATA_START	long word	Start of data
$10FD14	BIOS_CARD_TYPE	word	$0 : 8 bits card $01 : 16 bits card $80 : 16 bits wide weird card (todo)
$10FD16	BIOS_CARD_SIZE	word	Size of the card

BIOS_CARD_ANSWER

This variable contains the result of the operation. Bit 7 indicates an error.

• $00: Normal completion
• $80: No card inserted
• $81: Card isn't formatted
• $82: Requested data doesn't exist
• $83: FAT error
• $84: Card is full
• $85: Write disabled or ROM card

Commands

$0: Format memory card

Formats the memory card.

$1: Data search

Return the number of save files for the specified game.

Inputs:

BIOS_CARD_FCB must contain the NGH number of the desired game.

Outputs:

BIOS_CARD_SUB contains a 16 bit mask for all 16 available blocks for the game. If a bit is set, then the corresponding save block exists.

$2: Load data

Loads the specified save file in RAM.

Inputs:

• BIOS_CARD_FCB must contain the NGH number of the desired game.
• BIOS_CARD_SUB must contain the game save number (16 max. per game).
• BIOS_CARD_START must be a pointer to which the save data will be loaded.
• BIOS_CARD_SIZE must contain the size of the save (usually 64 bytes).

$3: Save data

Save from RAM to the specified save file.

Inputs:

• BIOS_CARD_FCB must contain the NGH number of the desired game.
• BIOS_CARD_SUB must contain the game save number (16 max. per game).
• BIOS_CARD_START must be a pointer from which the save data will be copied.
• BIOS_CARD_SIZE must contain the size of the save (usually 64 bytes).

$4: Delete data

Delete the specified file.

Inputs:

• BIOS_CARD_FCB must contain the NGH number of the desired game.
• BIOS_CARD_SUB must contain the game save number (16 max. per game).

$5: Read data title

Read the data title of a save file.

Inputs:

• BIOS_CARD_START must be a pointer to which the title string will be copied.
• BIOS_CARD_SIZE must contain the game save number ?

$6: Save user name

Set the user name of the memory card.

Inputs:

BIOS_CARD_START must be a pointer to the user name's string (max. 16 bytes).

$7: Load user name

Loads the user name of the memory card.

Inputs:

BIOS_CARD_START must be a pointer to which the user name's string will be copied.