feat: add 10 emulator profiles (batch 6)

gpsp (GBA, open BIOS fallback), ecwolf (ecwolf.pk3),
prboom (prboom.wad), x1 (Sharp X1, 5 files in xmil/),
minivmac (MacII.ROM/MacIIx.ROM), theodore (Thomson, all embedded),
crocods (CPC 6128, all embedded), vba_next (GBA, HLE fallback),
same_cdi (CD-i, 3 MAME ZIPs + 2 undeclared), beetle_lynx (lynxboot.img)

71 total profiles. Cross-reference: 690 undeclared, 186 in repo.

emulators/beetle_lynx.yml

@@ -0,0 +1,32 @@
+emulator: Beetle Lynx (Mednafen Lynx)
+type: libretro
+source: "https://github.com/libretro/beetle-lynx-libretro"
+cores: [mednafen_lynx]
+systems: [atari-lynx]
+verification: existence
+
+notes: >
+  Fork of Mednafen's Handy module for Atari Lynx emulation via libretro.
+  The core loads lynxboot.img from the system directory at game load time
+  (libretro.cpp:191). CRom constructor in rom.cpp reads exactly 512 bytes
+  from the file. If the file is missing or undersized, the ROM array is
+  filled with 0x88 (DEFAULT_ROM_CONTENTS) and the core continues without
+  error, but games will not boot correctly without the real boot ROM.
+  The cart database in cart.cpp identifies the BIOS by CRC32 0x0d973c9d
+  ("[BIOS] Atari Lynx (USA, Europe)", size 512).
+  No hash validation is performed on the BIOS at load time.
+  Core options: lynx_rot_screen (screen rotation), lynx_pix_format
+  (pixel format), lynx_force_60hz (force 60Hz refresh).
+  ROM extensions: .lnx, .lyx, .bll, .o
+
+files:
+  - name: "lynxboot.img"
+    description: "Atari Lynx Boot ROM"
+    region: "World"
+    required: true
+    size: 512
+    sha1: "e4ed47fae31693e016b081c6bda48da5b70d7ccb"
+    md5: "fcd403db69f54290b51035d82f835e7b"
+    crc32: "0d973c9d"
+    source_ref: "libretro.cpp:191, rom.cpp:50-78, cart.cpp:67"
+    notes: "512-byte boot ROM. Core silently degrades without it but games will not run."

emulators/crocods.yml

@@ -0,0 +1,59 @@
+emulator: CrocoDS
+type: libretro
+source: "https://github.com/libretro/libretro-crocods"
+cores:
+  - crocods
+systems:
+  - amstrad-cpc
+
+notes: |
+  CrocoDS is an Amstrad CPC 6128 emulator ported to libretro. Supports
+  .dsk, .sna, and .kcr file formats.
+
+  All system ROMs are compiled directly into the core binary as C byte
+  arrays. No external BIOS files are required.
+
+  Embedded ROMs (crocods-core/):
+    - cpc6128.bin.c: cpc6128_bin[32768] - CPC 6128 OS (16KB) + BASIC 1.1 (16KB)
+    - romdisc.bin.c: romdisc_bin[16384] - AMSDOS disk controller ROM (16KB)
+
+  ROM initialization in InitMemCPC() (crocods-core/vga.c:185-200):
+    - ROMINF (lower ROM, 16KB): first half of cpc6128_bin (OS)
+    - ROMEXT[0] (upper ROM slot 0, 16KB): second half of cpc6128_bin (BASIC)
+    - ROMEXT[7] (upper ROM slot 7, 16KB): romdisc_bin (AMSDOS)
+
+  Called from HardResetCPC() (crocods-core/platform.c:1009-1020) using
+  the extern byte arrays directly. No filesystem ROM loading exists in
+  the libretro path.
+
+  A Multiface ROM loader exists (crocods-core/multiface.c:51-61) that
+  reads LocRomMulti via fopen(), but InitMultiface() is never called
+  from the libretro build or platform.c. Dead code in libretro context.
+
+  The core does not request retro_system_directory or declare any
+  firmware entries in the .info file. need_fullpath is false.
+
+  Only the CPC 6128 model is emulated (no CPC 464/664 selection).
+
+files: []
+
+platform_details:
+  bios_mapping:
+    source_ref: "crocods-core/vga.c:185-200, crocods-core/platform.c:1009-1020"
+    notes: |
+      All ROMs are embedded. InitMemCPC() copies cpc6128_bin and romdisc_bin
+      into ROMINF and ROMEXT arrays via memcpy. No filesystem lookup occurs.
+      retro_set_environment() does not request system_directory.
+
+  embedded_roms:
+    source_ref: "crocods-core/cpc6128.bin.c, crocods-core/romdisc.bin.c"
+    notes: |
+      2 ROM sets embedded as C byte arrays:
+      cpc6128_bin (32KB) - CPC 6128 OS (lower 16KB) + BASIC 1.1 (upper 16KB)
+      romdisc_bin (16KB) - AMSDOS disk controller ROM, mapped to slot 7
+
+  model_rom_map:
+    source_ref: "crocods-core/vga.c:189-192"
+    notes: |
+      CPC 6128 only: OS in ROMINF, BASIC in ROMEXT[0], AMSDOS in ROMEXT[7]
+      emulator_patch_ROM() applies language patches to ROMINF after loading

emulators/ecwolf.yml

@@ -0,0 +1,32 @@
+emulator: ECWolf
+type: libretro
+source: "https://github.com/libretro/ecwolf"
+cores: [ecwolf]
+systems: [wolfenstein3d]
+verification: md5
+notes: >
+  Wolfenstein 3D source port. Plays Wolf3D (wl6/wl1), Spear of Destiny (sod/sdm),
+  Super 3D Noah's Ark (n3d), and community pk3 mods. The core requires ecwolf.pk3
+  in the system directory - this is the engine data package built from wadsrc/static/
+  containing IWADINFO definitions, palettes, sprites, map configs, and lump remappers.
+  Game data files (vswap, gamemaps, vgagraph, audiot) are loaded from the content
+  directory, not the system directory. The core auto-detects the game variant by
+  scanning lump contents against IWADINFO MustContain rules. Spear of Destiny
+  mission packs (sd2/sd3) and Mac Wolfenstein variants are also supported.
+  Blake Stone and Rise of the Triad support is flagged as Preview.
+  The SelectGame path searches: content directory, system directory, BaseDataPaths
+  config, then platform-specific paths (Steam, GOG installs on desktop).
+
+files:
+  - name: "ecwolf.pk3"
+    description: "ECWolf engine data package"
+    required: true
+    md5: "c011b428819eea4a80b455c245a5a04d"
+    source_ref: "ecwolf_libretro.info:firmware0, version.h:MAIN_PK3, wl_iwad.cpp:SelectGame"
+    notes: >
+      Built from wadsrc/static/ via zipdir. Contains IWADINFO (game detection rules),
+      palettes (wolfpal, spearpal, blakepal, noahpal), map lump remappers (wl6map,
+      sodmap, etc.), DECORATE actor definitions, MAPINFO, SNDINFO, SNDSEQ, textures,
+      sprites, fonts, and localization strings. Without this file the core errors
+      with "Could not open ecwolf.pk3!". The md5 corresponds to the version shipped
+      with the current libretro buildbot release.

emulators/gpsp.yml

@@ -0,0 +1,65 @@
+emulator: gpSP
+type: libretro
+source: "https://github.com/libretro/gpsp"
+cores:
+  - gpsp
+systems:
+  - nintendo-gba
+
+notes: |
+  gpSP is a Game Boy Advance emulator originally by Exophase, ported to
+  libretro. Historically it required the official GBA BIOS to run. Current
+  versions ship a built-in open-source BIOS (bios/open_gba_bios.bin) compiled
+  from bios/source/ that covers most games.
+
+  The core option gpsp_bios controls BIOS selection:
+    auto     (default) - try official gba_bios.bin, fall back to built-in
+    builtin  - always use the built-in open-source BIOS
+    official - try gba_bios.bin, warn and fall back to built-in if missing
+
+  A second option gpsp_boot_mode selects startup behavior:
+    game (default) - skip BIOS intro, boot directly into game
+    bios           - run the BIOS boot animation before launching
+
+  BIOS loading path (libretro/libretro.c:1093-1131):
+    1. Resolve system directory (RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY)
+    2. Append "/gba_bios.bin"
+    3. load_bios() reads 0x4000 (16 KB) into bios_rom[]
+    4. Sanity check: bios_rom[0] must be 0x18 (ARM branch opcode)
+    5. On failure, memcpy open_gba_bios_rom[] as fallback
+
+  The official BIOS improves compatibility for a few games that rely on
+  precise SWI behavior or BIOS checksum verification. The built-in BIOS
+  works for the vast majority of the GBA library.
+
+files:
+  # -------------------------------------------------------
+  # Game Boy Advance - BIOS (optional, built-in fallback)
+  # -------------------------------------------------------
+  - name: gba_bios.bin
+    system: nintendo-gba
+    required: false
+    size: 16384  # 16 KB (0x4000)
+    note: "Official GBA BIOS. Built-in open-source BIOS used as fallback. Real BIOS needed for full SWI accuracy and boot logo."
+    source_ref: "libretro/libretro.c:1111"
+
+platform_details:
+  gba:
+    bios_size: 16384  # 16 KB
+    hle_bios: true
+    source_ref: "libretro/libretro.c:1107-1131, bios/source/"
+    notes: |
+      The built-in BIOS (open_gba_bios_rom, 16 KB) is an open-source
+      reimplementation compiled from bios/source/. It implements most
+      SWI calls (SoftReset, RegisterRamReset, Halt, VBlankIntrWait,
+      arithmetic, decompression, sound, multiboot).
+
+      Validation is minimal: load_bios() in gba_memory.c reads exactly
+      0x4000 bytes. The libretro frontend checks bios_rom[0] == 0x18
+      (ARM branch instruction at reset vector) to reject garbage files.
+      No hash or checksum verification is performed.
+
+      The bios_type enum (main.h:56-61) defines three modes:
+        auto_detect  - try official first, fall back to built-in
+        builtin_bios - skip file load entirely, use open_gba_bios_rom
+        official_bios - try file, warn on failure, still fall back

emulators/minivmac.yml

@@ -0,0 +1,66 @@
+emulator: Mini vMac
+type: libretro
+source: "https://github.com/libretro/libretro-minivmac"
+systems: [macintosh-ii]
+
+# Mini vMac is a Macintosh II emulator. The libretro port is hardcoded for
+# Mac II emulation (CurEmMd = kEmMd_II) with 68020 CPU, FPU, ADB, VIA2, ASC.
+# ROM is loaded from the RetroArch system directory.
+
+# ROM loading order (OSGLUERETRO.c LoadMacRom):
+#   1. <system>/MacIIx.ROM    (tried first, same 256 KB size)
+#   2. <system>/MacII.ROM     (defined as RomFileName in CNFGRAPI.h)
+#   3. --rom command line arg  (if provided)
+#   4. ~/.gryphel/mnvm_rom/MacII.ROM
+#   5. app parent directory
+#   6. current directory
+
+# ROM size: kROM_Size = 0x00040000 = 262144 bytes (256 KB)
+# ROM checksums defined in CNFGRAPI.h:
+#   kRomCheckSum1 = 0x9779D2C4 (Mac II v1)
+#   kRomCheckSum2 = 0x97221136 (Mac II v2)
+# Note: DisableRomCheck = 1, so checksum validation is skipped at runtime
+# (ROMEMDEV.c patches the ROM check jump). Any 256 KB Mac II ROM works.
+
+files:
+  # -- MacII.ROM (primary, required) --
+  # Standard Macintosh II ROM image. This is the hardcoded RomFileName.
+  # The core reads exactly kROM_Size (262144) bytes from this file.
+
+  - name: "MacII.ROM"
+    path: "MacII.ROM"
+    required: true
+    size: 262144
+    source_ref: "minivmac/cfg/CNFGRAPI.h:32, minivmac/src/OSGLUERETRO.c:781"
+    note: >
+      Macintosh II ROM image (256 KB). The core loads this from the system
+      directory. Must be exactly 262144 bytes. ROM checksum verification is
+      disabled in the libretro build, so either Mac II ROM revision works.
+
+  # -- MacIIx.ROM (alternative, optional) --
+  # Tried before MacII.ROM in the loading sequence. The Mac IIx ROM is the
+  # same 256 KB size and is compatible with the Mac II emulation mode.
+
+  - name: "MacIIx.ROM"
+    path: "MacIIx.ROM"
+    required: false
+    size: 262144
+    source_ref: "minivmac/src/OSGLUERETRO.c:778"
+    note: >
+      Macintosh IIx ROM image (256 KB). Checked first in the ROM loading
+      sequence. If present, it takes priority over MacII.ROM. The Mac IIx
+      uses the same 68020-class architecture as the Mac II.
+
+notes:
+  emulation_target: >
+    The libretro build is configured exclusively for Macintosh II emulation
+    (kEmMd_II). Build options: 68020 CPU, FPU enabled, ADB keyboard/mouse,
+    VIA2, ASC sound chip. Screen: 640x480, 8-bit color depth.
+  disk_formats: >
+    Supported disk image formats: .dsk, .img, .zip, .hvf, .cmd
+    The core auto-inserts the loaded content as a floppy disk.
+    Supports up to NumDrives simultaneous disk images.
+  rom_checksum_note: >
+    DisableRomCheck is set to 1 in ROMEMDEV.c, meaning the core patches out
+    the ROM checksum verification at boot. This allows any valid Mac II era
+    ROM to work regardless of exact revision.

emulators/prboom.yml

@@ -0,0 +1,47 @@
+emulator: PrBoom
+type: libretro
+source: "https://github.com/libretro/libretro-prboom"
+systems: [doom]
+
+notes: |
+  PrBoom is a Doom source port based on MBF (Marine's Best Friend), itself
+  derived from Boom. The libretro port plays Doom, Doom II, Final Doom,
+  FreeDoom, and custom WADs/PWADs.
+
+  The core requires prboom.wad, a small engine data WAD containing internal
+  resources: font glyphs, palette, colormaps, sine/tangent tables, gamma
+  tables, menu graphics, and a null sprite (TNT1A0). It is NOT a game WAD.
+  The file is generated at build time by the rdatawad tool from raw PPM
+  graphics and LMP lumps (see Makefile.prboomdata), but ships pre-built
+  in the repository root.
+
+  Without prboom.wad the core falls back to hardcoded internal defaults
+  (d_main.c:1073-1074), so the file is technically optional but expected
+  for correct rendering of menus, HUD digits, and extended features.
+
+  File search order (libretro.c I_FindFile, line 1743):
+  1. WAD directory (same folder as the loaded game WAD)
+  2. system/prboom/ subdirectory
+  3. system/ directory directly
+  4. Parent folders of WAD directory (recursive, if enabled)
+
+  The core accepts .wad, .iwad, .pwad, and .lmp extensions. Game IWADs
+  it recognizes (d_main.c:133-145): doom2f.wad, doom2.wad, plutonia.wad,
+  tnt.wad, freedoom2.wad, doom.wad, doomu.wad, freedoom1.wad,
+  freedoom.wad, doom1.wad.
+
+  The src/ directory contains a second, larger prboom.wad (228743 bytes,
+  md5 23afd6143cb1ffec99a46755f9209ea6) which is the upstream PrBoom
+  original. The root copy (143312 bytes) is the libretro-specific build.
+
+files:
+  - name: "prboom.wad"
+    system: doom
+    description: "PrBoom engine data WAD (fonts, palette, colormaps, tables, menu graphics)"
+    required: false
+    size: 143312
+    md5: "72ae1b47820fcc93cc0df9c428d0face"
+    sha1: "5f4aed208301449c2e9514edfd325fe9dead76fa"
+    crc32: "a5751b99"
+    source_ref: "d_main.c:1069-1078 (PACKAGE .wad load), libretro.c:1743-1780 (I_FindFile search), config.h:46 (PACKAGE=prboom)"
+    notes: "Searched in system/prboom/ then system/. Falls back to internal defaults if missing, but menus and HUD may render incorrectly without it."

emulators/same_cdi.yml

@@ -0,0 +1,232 @@
+emulator: SAME CDi
+type: libretro
+cores: [same_cdi, cdi2015]
+source: "https://github.com/libretro/same_cdi"
+systems:
+  - cdi
+
+notes: |
+  SAME CDi is a Single Arcade Machine Emulator fork of MAME libretro, stripped
+  down to just the Philips CD-i driver. The core hardcodes "cdimono1" as the
+  forced system (retro_init.cpp:86) and searches for MAME ROM ZIPs in:
+    <system_dir>/same_cdi/bios/
+
+  The ROM path (-rp) is built at retro_init.cpp:534 as:
+    <game_path>;<system_dir>/same_cdi/bios/
+
+  MAME expects each romset as a ZIP containing the individual ROM files listed
+  below. The ZIP filenames (cdimono1.zip, cdimono2.zip, cdibios.zip) match
+  the MAME driver names. Only cdimono1.zip is required for consumer CD-i games;
+  cdimono2.zip and cdibios.zip are optional (Mono-II and Quizard arcade).
+
+  cdi2015 is an older MAME 2015-based CD-i core with the same BIOS layout.
+
+  ROM definitions: src/mame/drivers/cdi.cpp lines 574-650.
+  System forced: src/osd/libretro/libretro-internal/retro_init.cpp:86.
+  BIOS path: src/osd/libretro/libretro-internal/retro_init.cpp:534.
+  Firmware list: same_cdi_libretro.info firmware0-2.
+
+files:
+  # =====================================================
+  # cdimono1.zip - Philips CD-i Mono-I (PAL) - REQUIRED
+  # Contains main CPU BIOS + servo/slave MCU dumps
+  # =====================================================
+
+  # Main CPU BIOS (one of three, selected via MAME BIOS switch)
+  - name: "cdi200.rom"
+    zip: "cdimono1.zip"
+    system: cdi
+    region: [north-america]
+    required: true
+    size: 524288  # 0x80000
+    crc32: "40c4e6b9"
+    sha1: "d961de803c89b3d1902d656ceb9ce7c02dccb40a"
+    note: "Magnavox CD-i 200 BIOS. Default BIOS for cdimono1."
+    source_ref: "src/mame/drivers/cdi.cpp:577"
+
+  - name: "cdi220b.rom"
+    zip: "cdimono1.zip"
+    system: cdi
+    region: [europe]
+    required: true
+    size: 524288  # 0x80000
+    crc32: "279683ca"
+    sha1: "53360a1f21ddac952e95306ced64186a3fc0b93e"
+    note: "Philips CD-i 220 F2 BIOS. Alternate BIOS for cdimono1."
+    source_ref: "src/mame/drivers/cdi.cpp:579"
+
+  - name: "cdi220.rom"
+    zip: "cdimono1.zip"
+    system: cdi
+    region: [europe]
+    required: false
+    size: 524288  # 0x80000
+    crc32: "584c0af8"
+    sha1: "5d757ab46b8c8fc36361555d978d7af768342d47"
+    note: "Philips CD-i 220 BIOS (alternate, does not boot). Marked non-working."
+    source_ref: "src/mame/drivers/cdi.cpp:581"
+
+  # Servo MCU (MC68HC705C8A) - shared with cdi910 dump, BAD_DUMP
+  - name: "zx405037p__cdi_servo_2.1__b43t__llek9215.mc68hc705c8a_withtestrom.7201"
+    zip: "cdimono1.zip"
+    system: cdi
+    required: true
+    size: 8192  # 0x2000
+    crc32: "7a3af407"
+    sha1: "fdf8d78d6a0df4a56b5b963d72eabd39fcec163f"
+    note: "Servo MCU 2.1, taken from cdi910 (BAD_DUMP, no Mono-I specific dump)."
+    source_ref: "src/mame/drivers/cdi.cpp:584"
+
+  # Slave MCU (MC68HC705C8A) - shared with cdi910 dump, BAD_DUMP
+  - name: "zx405042p__cdi_slave_2.0__b43t__zzmk9213.mc68hc705c8a_withtestrom.7206"
+    zip: "cdimono1.zip"
+    system: cdi
+    required: true
+    size: 8192  # 0x2000
+    crc32: "688cda63"
+    sha1: "56d0acd7caad51c7de703247cd6d842b36173079"
+    note: "Slave MCU 2.0, taken from cdi910 (BAD_DUMP, no Mono-I specific dump)."
+    source_ref: "src/mame/drivers/cdi.cpp:587"
+
+  # =====================================================
+  # cdimono2.zip - Philips CD-i Mono-II (NTSC) - OPTIONAL
+  # MACHINE_NOT_WORKING in MAME
+  # =====================================================
+
+  - name: "philips__cdi-220_ph3_r1.2__mb834200b-15__02f_aa__9402_z04.tc574200-le._1.7211"
+    zip: "cdimono2.zip"
+    system: cdi
+    required: false
+    size: 524288  # 0x80000
+    crc32: "17d723e7"
+    sha1: "6c317a82e35d60ca5e7a74fc99f665055693169d"
+    note: "Mono-II main CPU BIOS. Philips CDI-220 PH3 R1.2."
+    source_ref: "src/mame/drivers/cdi.cpp:623"
+
+  - name: "zc405351p__servo_cdi_4.1__0d67p__lluk9404.mc68hc705c8a.7490"
+    zip: "cdimono2.zip"
+    system: cdi
+    required: false
+    size: 8192  # 0x2000
+    crc32: "2bc8e4e9"
+    sha1: "8cd052b532fc052d6b0077261c12f800e8655bb1"
+    note: "Mono-II servo MCU 4.1."
+    source_ref: "src/mame/drivers/cdi.cpp:626"
+
+  - name: "zc405352p__slave_cdi_4.1__0d67p__lltr9403.mc68hc705c8a.7206"
+    zip: "cdimono2.zip"
+    system: cdi
+    required: false
+    size: 8192  # 0x2000
+    crc32: "5b19da07"
+    sha1: "cf02d84977050c71e87a38f1249e83c43a93949b"
+    note: "Mono-II slave MCU 4.1."
+    source_ref: "src/mame/drivers/cdi.cpp:629"
+
+  # =====================================================
+  # cdibios.zip - CD-i BIOS for Quizard arcade - OPTIONAL
+  # Subset of cdimono1 ROMs + slave MCU, used by Quizard games
+  # =====================================================
+
+  # cdibios reuses cdi200.rom and cdi220b.rom (same hashes as cdimono1)
+  # plus the slave MCU. Listed here for completeness of the ZIP contents.
+
+  - name: "cdi200.rom"
+    zip: "cdibios.zip"
+    system: cdi
+    required: false
+    size: 524288  # 0x80000
+    crc32: "40c4e6b9"
+    sha1: "d961de803c89b3d1902d656ceb9ce7c02dccb40a"
+    note: "Magnavox CD-i 200 BIOS (same as cdimono1). For Quizard arcade."
+    source_ref: "src/mame/drivers/cdi.cpp:639"
+
+  - name: "cdi220b.rom"
+    zip: "cdibios.zip"
+    system: cdi
+    required: false
+    size: 524288  # 0x80000
+    crc32: "279683ca"
+    sha1: "53360a1f21ddac952e95306ced64186a3fc0b93e"
+    note: "Philips CD-i 220 F2 BIOS (same as cdimono1). For Quizard arcade."
+    source_ref: "src/mame/drivers/cdi.cpp:641"
+
+  - name: "zx405042p__cdi_slave_2.0__b43t__zzmk9213.mc68hc705c8a_withtestrom.7206"
+    zip: "cdibios.zip"
+    system: cdi
+    required: false
+    size: 8192  # 0x2000
+    crc32: "688cda63"
+    sha1: "56d0acd7caad51c7de703247cd6d842b36173079"
+    note: "Slave MCU 2.0 (BAD_DUMP, same as cdimono1). For Quizard arcade."
+    source_ref: "src/mame/drivers/cdi.cpp:645"
+
+  # =====================================================
+  # Additional MAME romsets (not in libretro .info firmware list)
+  # These are part of the MAME driver but not declared as
+  # required firmware by the libretro core.
+  # =====================================================
+
+  # cdi910 - CD-i 910-17P Mini-MMC (PAL) - MACHINE_NOT_WORKING
+  - name: "philips__cd-i_2.1__mb834200b-15__26b_aa__9224_z01.tc574200.7211"
+    zip: "cdi910.zip"
+    system: cdi
+    required: false
+    size: 524288  # 0x80000
+    crc32: "4ae3bee3"
+    sha1: "9729b4ee3ce0c17172d062339c47b1ab822b222b"
+    note: "CD-i 910-17P Mini-MMC BIOS. Not listed in libretro firmware."
+    source_ref: "src/mame/drivers/cdi.cpp:594"
+
+  - name: "cdi910.rom"
+    zip: "cdi910.zip"
+    system: cdi
+    required: false
+    size: 524288  # 0x80000
+    crc32: "2f3048d2"
+    sha1: "11c4c3e602060518b52e77156345fa01f619e793"
+    note: "CD-i 910 alternate BIOS. Not listed in libretro firmware."
+    source_ref: "src/mame/drivers/cdi.cpp:596"
+
+  # cdi490a - CD-i 490 - MACHINE_NOT_WORKING
+  - name: "cdi490a.rom"
+    zip: "cdi490a.zip"
+    system: cdi
+    required: false
+    size: 524288  # 0x80000
+    crc32: "e2f200f6"
+    sha1: "c9bf3c4c7e4fe5cbec3fe3fc993c77a4522ca547"
+    note: "CD-i 490 BIOS. Not listed in libretro firmware."
+    source_ref: "src/mame/drivers/cdi.cpp:633"
+
+  - name: "impega.rom"
+    zip: "cdi490a.zip"
+    system: cdi
+    required: false
+    size: 262144  # 0x40000
+    crc32: "84d6f6aa"
+    sha1: "02526482a0851ea2a7b582d8afaa8ef14a8bd914"
+    note: "CD-i 490 MPEG audio decoder ROM."
+    source_ref: "src/mame/drivers/cdi.cpp:636"
+
+  - name: "vmpega.rom"
+    zip: "cdi490a.zip"
+    system: cdi
+    required: false
+    size: 262144  # 0x40000
+    crc32: "db264e8b"
+    sha1: "be407fbc102f1731a0862554855e963e5a47c17b"
+    note: "CD-i 490 MPEG video decoder ROM."
+    source_ref: "src/mame/drivers/cdi.cpp:637"
+
+platform_details:
+  cdi:
+    bios_path: "same_cdi/bios/"
+    forced_system: "cdimono1"
+    primary_zip: "cdimono1.zip"
+    optional_zips: ["cdimono2.zip", "cdibios.zip"]
+    mame_romsets: ["cdimono1", "cdimono2", "cdibios", "cdi910", "cdi490a"]
+    rom_path_flag: "-rp"
+    rom_search_path: "<game_path>;<system_dir>/same_cdi/bios/"
+    supported_extensions: ["chd", "iso", "cue"]
+    source_ref: "retro_init.cpp:86,534 same_cdi_libretro.info"

emulators/theodore.yml

@@ -0,0 +1,30 @@
+# Theodore - Thomson MO/TO computer emulator
+# https://github.com/Zlika/theodore
+# Emulates: TO7, TO7/70, TO8, TO8D, TO9, TO9+, MO5, MO6, PC128 (Olivetti Prodest)
+# Based on Daniel Coulom's DCTO8D, DCTO9P, and DCMO5 emulators
+
+core_name: theodore
+systems:
+  - Thomson MO5
+  - Thomson MO6
+  - Thomson TO7
+  - Thomson TO7/70
+  - Thomson TO8
+  - Thomson TO8D
+  - Thomson TO9
+  - Thomson TO9+
+  - Olivetti Prodest PC128
+
+bios_files: []
+# All system ROMs are embedded directly in the source code as C arrays:
+#   rom_to7.inc, rom_to770.inc, rom_to8.inc, rom_to8d.inc,
+#   rom_to9.inc, rom_to9p.inc, rom_mo5.inc, rom_mo6.inc,
+#   rom_pc128.inc, basic-1_memo7.inc, basic-128_memo7.inc
+# No external BIOS or firmware files are required.
+
+notes: |
+  Theodore embeds all Thomson monitor ROMs and BASIC ROMs at compile time.
+  The core option "theodore_rom" selects the emulated model (Auto by default).
+  TO7 and TO7/70 auto-load the BASIC 1 cartridge when no cartridge is provided.
+  Supported file formats: fd, sap, k7, m7, m5, rom.
+  The core can run without any game loaded (SET_SUPPORT_NO_GAME = true).

emulators/vba_next.yml

@@ -0,0 +1,69 @@
+emulator: VBA-Next
+type: libretro
+source: "https://github.com/libretro/vba-next"
+cores:
+  - vba_next
+systems:
+  - nintendo-gba
+
+notes: |
+  VBA-Next is a Game Boy Advance emulator forked from VBA-M, optimized for
+  libretro. It includes a built-in HLE BIOS (myROM array in src/gba.cpp:8423)
+  that handles all standard SWI calls, so no external BIOS file is needed for
+  most games.
+
+  BIOS loading is gated behind HAVE_HLE_BIOS (defined in build/Makefile.common)
+  and controlled by core option vbanext_bios (default: enabled). When enabled,
+  the libretro port looks for gba_bios.bin in RetroArch's system directory
+  (libretro/libretro.cpp:198-203). CPUInit() loads the file via utilLoad(),
+  validates it is exactly 0x4000 bytes (16 KB), and sets useBios = true
+  (src/gba.cpp:12413-12443). If loading fails or the option is off, the HLE
+  BIOS (myROM) is memcpy'd into the bios buffer instead.
+
+  CPUIsGBABios() accepts extensions: .gba, .agb, .bin, .bios, .rom
+  (src/gba.cpp:8851-8873).
+
+  When useBios is true and skipBios is false, execution starts at 0x00000000
+  (real BIOS entry). Otherwise it jumps straight to 0x08000000 (ROM entry),
+  skipping the boot animation (src/gba.cpp:12657-12675).
+
+  The HLE BIOS covers: SoftReset, RegisterRamReset, Halt, VBlankIntrWait,
+  Div, Sqrt, ArcTan, ArcTan2, CpuSet, CpuFastSet, GetBiosChecksum,
+  BgAffineSet, ObjAffineSet, BitUnPack, LZ77UnComp (WRAM/VRAM),
+  HuffUnComp, RLUnComp (WRAM/VRAM), Diff8bitUnFilter (WRAM/VRAM),
+  Diff16bitUnFilter, MidiKey2Freq, SndDriverJmpTableCopy
+  (src/gba.cpp:2369-2578).
+
+  Some per-game overrides in gbaover[] (libretro/libretro.cpp:235) have a
+  useBios field, but all entries currently set it to 0 (no game forces BIOS).
+
+files:
+  # -------------------------------------------------------
+  # Game Boy Advance - BIOS (optional, HLE fallback)
+  # -------------------------------------------------------
+  - name: gba_bios.bin
+    system: nintendo-gba
+    required: false
+    size: 16384  # 16 KB (0x4000)
+    note: "GBA BIOS. Optional -- HLE replacement (myROM) handles all standard SWI calls. Real BIOS adds startup logo and may improve edge-case accuracy."
+    source_ref: "libretro/libretro.cpp:198-203, src/gba.cpp:12413-12443"
+
+platform_details:
+  gba:
+    bios_size: 16384  # 0x4000
+    hle_bios: true
+    source_ref: "src/gba.cpp:8423 (myROM), src/gba.cpp:2369-2578 (SWI handlers)"
+    notes: |
+      BIOS buffer is always allocated at 0x4000 bytes (src/gba.cpp:8963).
+      If the real BIOS loads successfully (exactly 0x4000 bytes), useBios is
+      set to true and CPUReset starts at address 0x00000000 with IRQ disabled.
+      Otherwise myROM (built-in HLE stub) is copied in and execution starts
+      at 0x08000000 with standard register init.
+
+      The core option vbanext_bios defaults to "enabled", so if gba_bios.bin
+      is present in the system directory it will be loaded automatically.
+
+      BIOS reads at runtime go through the memory map (src/gba.cpp:792-1076).
+      Address range 0x0000-0x3FFF maps to the bios buffer. A biosProtected[4]
+      array at 0x00f029e1 is returned when reading outside the current PC
+      region, matching real GBA BIOS protection behavior.

emulators/x1.yml

@@ -0,0 +1,80 @@
+emulator: "X Millennium"
+type: libretro
+source: "https://github.com/libretro/xmil-libretro"
+cores:
+  - x1
+systems:
+  - sharp-x1
+
+# X Millennium (XMIL) is a Sharp X1 series emulator by yui. The libretro port
+# supports X1, X1 Turbo, and X1 TurboZ models via the "X1_ROMTYPE" core option
+# (values: X1, TURBO, TURBOZ; default: X1 = ROM_TYPE 1).
+#
+# All system files go under: <system_dir>/xmil/
+# (libretro.c:597 builds the path as "<system_dir>/xmil")
+#
+# IPL ROM loading (memio.c:88-116):
+#   ROM_TYPE 0: uses built-in default IPL (575 bytes, basic boot stub from defipl.res)
+#   ROM_TYPE 1 (X1): loads xmil/IPLROM.X1 (32 KB)
+#   ROM_TYPE 2 (Turbo): loads xmil/IPLROM.X1T (32 KB)
+#   ROM_TYPE 3 (TurboZ): loads xmil/IPLROM.X1T (32 KB, same file as Turbo)
+#   If the file is missing, the core falls back to the built-in default IPL.
+#
+# Font loading (font.c:90-127, fontx1.c:70-123):
+#   font_load() calls x1fontread() which looks for font files using fontopen().
+#   fontopen() resolves paths relative to the working directory (file_getcd()),
+#   which in libretro context is the xmil subdirectory.
+#   Built-in defaults (defrom_ank, defrom_txt) are used for basic ASCII rendering.
+#   External font ROMs add full Japanese character support.
+#
+# The .info file only lists IPLROM.X1 and IPLROM.X1T as required BIOS files.
+# Font ROMs are optional -- the core renders basic text without them but Japanese
+# kanji display requires the external font files.
+
+notes: |
+  Place all files in: <system_dir>/xmil/
+  The core selects between IPLROM.X1 and IPLROM.X1T based on the "X1_ROMTYPE"
+  core option. A built-in fallback IPL exists but lacks full boot functionality.
+  Font files are optional; without them, kanji/JIS characters won't render.
+
+files:
+  # -- IPL ROMs --
+
+  - name: IPLROM.X1
+    path: xmil/IPLROM.X1
+    size: 32768
+    md5: eeeea1cd29c6e0e8b094790ae969bfa7
+    required: true
+    note: "X1 IPL ROM (32 KB). Loaded when ROM_TYPE=1 (X1 model). Listed in .info."
+    source_ref: "io/memio.c:82,96-103"
+
+  - name: IPLROM.X1T
+    path: xmil/IPLROM.X1T
+    size: 32768
+    md5: 851e4a5936f17d13f8c39a980cf00d77
+    required: true
+    note: "X1 Turbo/TurboZ IPL ROM (32 KB). Loaded when ROM_TYPE=2 or 3. Listed in .info."
+    source_ref: "io/memio.c:83,97-99"
+
+  # -- Font ROMs (optional, for Japanese text rendering) --
+
+  - name: FNT0808.X1
+    path: xmil/FNT0808.X1
+    size: 2048
+    required: false
+    note: "8x8 ANK font ROM (2 KB). Provides half-width ASCII/kana characters."
+    source_ref: "font/fontdata.c:6, font/fontx1.c:79-87"
+
+  - name: FNT0816.X1
+    path: xmil/FNT0816.X1
+    size: 4096
+    required: false
+    note: "8x16 ANK font ROM (4 KB). Provides taller half-width characters for text mode."
+    source_ref: "font/fontdata.c:7, font/fontx1.c:89-103"
+
+  - name: FNT1616.X1
+    path: xmil/FNT1616.X1
+    size: 306176
+    required: false
+    note: "16x16 Kanji font ROM (~299 KB). Full JIS kanji character set for Japanese text."
+    source_ref: "font/fontdata.c:8, font/fontx1.c:105-120"