BIOS calls

Please see ASM Defines or C Defines for the hex addresses.

Jump tables

Call address	NEO-EP0 AES BIOS	"SP-E" MVS BIOS	"TOP-SP1-1" CDM3-2 BIOS	"NEOCD.BIN" CDZ BIOS
$C00402 to $C00432	Entry point
$C00438	VBlank handler for boot process (?)
$C0043E	?		RTS
$C00444	Some games JMP here
$C0044A	BIOSF_VBL
$C00450,$C00456	?
$C0045C	RTS	BIOSF_GETTIME	RTS
$C00462	RTS	?	RTS
$C00468	BIOSF_CRDACCESS		?
$C0046E	BIOSF_CRDREPORT		?
$C00474	BIOSF_HOWTOPLAY?	BIOSF_HOWTOPLAY	RTS
$C0047A	?		RTS
$C00480 to $C004BC	RTS
$C004C2	BIOSF_CLEARFIX
$C004C8	BIOSF_CLEARSPR
$C004CE, $C004D4	?
$C004DA	RTS		HBlank handler
$C004E0 to $C004F2	Invalid		$FF0000 range register operations and RTEs
$C004F8 to $C0051C	Invalid		RTS
$C00522 to $C00540	Invalid		?
$C00546	Invalid		BIOSF_UPLOAD
$C0054C	Invalid		?
$C00522	Invalid		BIOSF_LOADFILE
$C00558	Invalid		?
$C0055E	Invalid		BIOSF_CDPLAYER
$C00564	Invalid		BIOSF_LOADFILEX (?)
$C0056A	Invalid		BIOSF_CDDACMD
$C00570	Invalid		BIOSF_VIDEOEN
$C00576 to $C00582	Invalid		?
$C00588 to $C00594	Invalid		RTS	?
$C0059A to $C006FC	Invalid		RTS

Generic BIOS calls

BIOS calls common to every system.

• BIOSF_CLEARFIX: Clear fix layer
• BIOSF_CLEARSPR: Clear sprites
• BIOSF_VBL: Multiple purpose VBL routine

AES/MVS only BIOS calls

• BIOSF_CRDACCESS: Perform memory card operation

CD only BIOS calls

• BIOSF_VIDEOEN: Enable/disable video layers
• BIOSF_UPLOAD: Upload data to DRAM
• BIOSF_LOADFILE: Load file from CD (with animation)
• BIOSF_CDPLAYER ($C0055E): Reset to CD player
• BIOSF_LOADFILEX (?) ($C00564): Load file from CD (no animation)
• BIOSF_CDDACMD: Issue CDDA command

CDZ only BIOS calls

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