BIOS calls
Please see ASM Defines or C Defines for the hex addresses.
Jump tables
| Call address | "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 | BIOSF_GETTIME | ? | |
| $C00462 | ? | RTS | |
| $C00468 | BIOSF_CRDACCESS | ? | |
| $C0046E | BIOSF_CRDREPORT | ? | |
| $C00474 | BIOSF_HOWTOPLAY | RTS | |
| $C0047A | ? | RTS | |
| $C00480 to $C004BC | RTS | ||
| $C004C2 | BIOSF_CLEARFIX | ||
| $C004C8 | BIOSF_CLEARSPR | ||
| $C004CE, $C004D4 | ? | ||
| $C004DA | Invalid | 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
Check track 0 ? Copy protection