According to a post on segaxtreme.net the Sega Saturn executes the first file it find on the disc, most of the time its in the root directory in alphabetical order.
Use a save state: cyberwarriorx/yssloader: An IDA Pro plugin for importing Yabause YSS save states
The standard SIG files won’t find many functions if the game was compiled with PSYQ!
cyberwarriorx/vcdextract: A tool for extracting Sega Saturn discs for later rebuilding
doyousketch2/SatRGB: Extract RGB images from Sega Saturn files
These games use the standard .sig files provided and all find a reasonable amount of function names:
You can find the version of libraries that each games uses by searching the executables/save states for the string “Version”.
| Game | Library Functions Found | Version Info |
|---|---|---|
| Tomb Raider (Core Demo) | 302 | CPK 1.20 GFS_SGL 2.11 STM_SGL 2.11 |
| Bug Too (Bootleg 2 demo) | 160 | GFS_SBL 2.10, SYS 2.11 |
| Baku Baku Demo (Flash Demo Disc) | 0 | GFS_SBL 2.10, SYS 2.11 |
| Sonic Xtreme proto | 101 | GFS_SGL 2.11 |
| Steep Slope Sliders Demo (Flash v6) | 75 | SYS 2.50 GFS_SGL 2.12 STM_SGL 2.11 SYS 2.11 CPK 1.20 |
| Daytona CCE (Bootleg 2 demo) | 0 | SYS 2.20, GFS_SBL 2.10 |
| Three Dirty Dwarfs (Bootleg 2 demo) | 185 | FLD 1.21 GFS_SGL 2.11 GFS_SBL 2.10 SYS 2.11 |
| Blam! Machinehead (Core Demo) | 246 | GFS_SGL 2.11 STM_SGL 2.11 CPK 1.20 SYS 2.11 |
Strange thing is that Bug Too manages to find tons of library functions (160) but the Baku Baku Demo finds 0, but they both use exactly the same versions of the standard Sega Saturn libraries!
My guess is that its because it was compiled/assembled with a different toolchain, so Bug Too was presumably GNU compiled but Baku Baku could have been compiled with something else.
| Library | Version |
|---|---|
| BUP | 1.20 1996-06-19 |
| BUP | 1.21 1996-08-06 |
| BUP | 1.24 1997-03-12 |
| BUP | 1.25 1997-06-20 |
| CDC | 1.22 1997-02-27 |
| CPK | 1.10 1995-03-31 |
| CPK | 1.20 1995-10-05 |
| CPK | 1.22 1996-03-14 |
| CPK | 1.23 1996-04-09 |
| CPK | 1.24 1996-06-14 |
| CPK | 1.25 1997-06-11 |
| FLD | 1.20 1996-01-31 |
| FLD | 1.21 1996-02-28 |
| FLD | 3.00 1997-05-06 |
| GFS_SBL | 2.10 1996-02-01 |
| GFS_SBL | 2.11 1996-02-18 |
| GFS_SBL | 2.12 1996-12-04 |
| GFS_SBL | 2.14 1997-04-11 |
| GFS_SBL | 2.15 1997-07-01 |
| GFS_SBL | 2.16 1998-01-16 |
| GFS_SGL | 2.10 1996-02-01 |
| GFS_SGL | 2.11 1996-03-21 |
| GFS_SGL | 2.12 1996-12-04 |
| GFS_SGL | 2.14 1997-04-11 |
| PCM | 1.15 1995-02-21 |
| PCM | 1.16 1995-03-31 |
| PCM | 1.20 1996-08-01 |
| PCM | 1.21 1996-10-14 |
| PCM | 1.22 1997-03-10 |
| PCM | 1.23 1997-06-10”, |
| PCM | 1.24 1997-06-23 |
| PCM | 1.26 1997-08-26 |
| PCM | 1.27 1997-10-18 |
| PCM | 1.28 1997-11-21 |
| STM_SBL | 2.10 1996-02-01 |
| STM_SBL | 2.11 1996-03-21 |
| STM_SBL | 2.12 1997-02-27 |
| STM_SBL | 2.12 1997-02-27 |
| STM_SGL | 2.10 1996-02-01 |
| STM_SGL | 2.11 1996-03-21 |
| STM_SGL | 2.12 1997-02-27 |
| SYS | 2.10 1996-01-31 |
| SYS | 2.11 1996-02-26 |
| SYS | 2.20 1996-08-06 |
| SYS | 2.21 1996-10-01 |
| SYS | 2.50 1997-06-10 |
| SYS | 2.52 1997-09-24 |
| SYS | 2.53 1997-12-15 |
What is the Date at 0x06000C30 it could be a bios version as it seems to be 1994-08-01 even for games that link in libraries such as GFS_SBL from 1996-02-01.
Known values:
Some games don’t work with the standard generated signature files, in these cases we need to manually find the library functions.
Many Games have strings such as GFS_SBL 2.10 1996-02-01 in them, these denote the start of a library inside the executable.
Although not all games have these references such as Bubble Bobble but it is known that it was compiled with PSYQ so that could be the culprit.
