Lunar - Silver Star Story Complete (Japan) needs the MPEG card and stops Yabause after its logos. Lunar - Silver Star Story (Japan) reaches its title on Beetle Saturn and Yabause with the RetroArch pack's BIOS (records 2026-10-28-6b5b55d3480f, 2026-10-28-9270d1928be7), judged against the reference frames added to the oracle.
Lunar - Silver Star Story Complete (Japan) stops after its logos with the pack's v1.00 Japan image and with v1.01 alike (record 2026-10-28-32cdefcdb231). The CD block passes the MPEG card check (cs2.c:3172-3212) and decodes nothing (2870-2884). The pack's saturn_bios.bin is not the cause.
try_use_bios skips a listed file that is not 512 KB (frontend/libretro.c:3632) and one without the kernel's first instruction or "PS compatible" at 0x12c (3646-3651). validation: [size, signature] on the seven listed names. Closes the four open pcsx_rearmed findings.
The region BIOS option names scph5500/5501/5502.bin by default and LoadImageFromFile checks only the size (host_interface.cpp:124-133, bios.cpp:82-105). The md5 table serves the directory scan and the Fast Boot patch. validation: [size], found_by: name. Closes the open swanstation finding.
firmware_is_present logs a SHA1 that differs and returns true (libretro.c:853-860), the override path does the same (744-756). on_mismatch: warn on every hashed entry. Closes the two open beetle_psx findings.
core_probe rejudge, offline: 273 live core_probe records judged against the current oracle, each superseding its earlier line. Every repetition now names the BIOS it ran. The Beetle PSX region runs with only the other regions' files booted on OpenBIOS (Firmware is missing), PCSX-ReARMed's loaded the other region's file.
Beetle Saturn rerun with its reference frames and error patterns, SwanStation and PCSX-ReARMed run for the first time: each region's game with every regional BIOS, its own only, the others only and the region pack.
DuckStation on Bust-A-Move 2 (USA): boots with scph5501.bin, draws nothing for 90 seconds without it (hang). PCSX2 on Rez (USA): boots with ps2-0230a-20080220.bin, bios_error without it.
When the region's file is absent, libretro.c (7fea57a5) finds no name and no matching sha1, then maps its built-in OpenBIOS (libretro.c:3425-3511). The region runs show it: each region's disc reaches its game with only the other regions' BIOS staged, under the oracle's reference frames (records 2026-10-27-55dd1e4943c4, 13be0e68b799, 33780d47efdf). scph5500.bin, scph5501.bin and scph5502.bin are required: false, hle_fallback stays true. Written through campaign_profiles.
Beetle PSX, Beetle PSX HW and SwanStation rerun under the oracle with the Japanese BIOS menu as an error screen: a Japanese BIOS under a US disc is now a BIOS error.
Without a BIOS, PCSX2 logs and shows 'PCSX2 requires a PlayStation 2 BIOS in order to run'. That line is now one of PCSX2's error patterns, for the next run's verdict: this record was judged without it.
Twelve runs on each of beetle_psx and beetle_saturn: each region's game with every regional BIOS, its own only, the others only and the region pack. One DuckStation check on the US disc with and without scph5501.bin.
Puzzle Bobble 2 (Japan) and Bust-A-Move 2 (Europe) on the PlayStation cores, and the three Saturn editions on Beetle Saturn, each frame reviewed on its PNG. Beetle Saturn's BIOS error lines, read from ss.c, are its error patterns.
Reference runs, then the full set, no BIOS and negative variants of Bust-A-Move 2 (USA) on Beetle PSX, Beetle PSX HW, SwanStation, PCSX-ReARMed and PCSX1, each judged by the boot oracle.
Ten core_probe runs of the beetle-saturn fix-mpeg-auth-cr2 branch, one
per commit: the Lunar opening movie (2400 frames) and the Big Buck Bunny
Video CD booting through the card's player. Issue 85.
First real pass of campaign.py: the libretro PlayStation profiles with an hle_fallback claim (beetle_psx through mednafen_psx and mednafen_psx_hw, pcsx_rearmed and swanstation nightlies, pcsx1 built from its pinned commit), each run on Bust-A-Move 2 - Arcade Edition (USA) with and without scph5501.bin, under bubblewrap. Every core reached the game without the BIOS.
With COMMAND_AUTH_DEVICE and COMMAND_GET_AUTH reading CR2, beetle_saturn 2ce77e2 authenticates the Video CD Card on Lunar - Silver Star Story MPEG: MPEG.AuthState is 02 with the HSS-0119 and the MK-80310 images, 00 with no file. The full machine state differs between two identical repetitions, the authentication state does not.
Each line of measurements/<emulator>.jsonl now holds the whole run:
every repetition, core logs, per-frame hashes and raw timings. The gzip
data files, the data schema and the split and join code are gone, and
core_probe --record appends one line. record_version moves to 3.
The seven records are rewritten once: each new line equals its old line
joined with its data file, and rebuilds the first-layout file its id
hashes.
The seven core probe records move from Abdess/retrobios-measurements at
75e878143687 into this repository, copied byte for byte: one .jsonl per
emulator and a gzip data file per record. merge=union lets two branches
that each add a line merge.
A record is now one line of records/<emulator>.jsonl in the measurements repository, under 20 KB, and a gzip sidecar holding every repetition, the core logs and the raw timings, its sha256 in the line. record_version 2, core-probe-data.schema.json for the sidecar. core_probe --record appends to a measurements clone and refuses a directory inside this repository's tracked tree.
The seven records of issue 85 moved to Abdess/retrobios-measurements: each line plus its sidecar rebuilds the first file, and keeps its first id.
Seven core_probe check records for issue 85: Beetle Saturn and Yabause on a Video CD and on Lunar - Silver Star Story MPEG, each run with the eight mpeg_card.bin images, no file, zeros and a 1-byte file.
Abdessamad Derraz