mirror of
https://github.com/Abdess/retroarch_system.git
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Abdessamad Derraz
b3b3880c19
Profiles that read two repositories, a libretro port and its upstream, now prefix each citation with source or upstream, decided by which tree carries the cited value at its pin. The emulator pages use the word to tell libretro glue, emulator code as the port carries it, and the upstream emulator apart.
138 lines
7.2 KiB
YAML
138 lines
7.2 KiB
YAML
emulator: "MD.emu"
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type: standalone
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core_classification: community_fork
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source: "https://github.com/Rakashazi/emu-ex-plus-alpha"
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upstream: "https://github.com/ekeeke/Genesis-Plus-GX"
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profiled_date: "2026-08-12"
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source_commit: "1c12fac5ce49badaadff2e2f210dcc30b89f4943"
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upstream_commit: "27426f00aa68f9f358c86919e8a40985326fa05b"
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core_version: "1.5.85"
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display_name: "Sega - MS/MD/CD (MD.emu)"
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mode: standalone
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cores:
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- "md-emu"
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- "MD.emu"
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- "MD-EMU"
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systems:
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- sega-megadrive
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- sega-megacd
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- sega-mastersystem
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notes: |
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Android and Linux member of the EX Emulator series by Robert Broglia, published
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as com.explusalpha.MdEmu (MD.emu/metadata/conf.mk:2,4,6,7, README.md:3-4) and
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reached by ES-DE through its MD-EMU find rule. Genesis Plus GX is vendored under
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MD.emu/src/genplus-gx and driven by the app's own system, input and audio layers
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(MD.emu/src/CMakeLists.txt:6-55), while the Sega CD hardware comes from the Gens
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code PicoDrive carried (MD.emu/src/scd/LC89510.cc:1-7) and disc images are read
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through Mednafen's CD layer (MD.emu/CMakeLists.txt:12). The build defines
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LSB_FIRST, NO_SYSTEM_PICO and MDFN_CD_NO_CCD (MD.emu/CMakeLists.txt:25), leaving
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Pico out and CD support in. Content is read from .bin, .smd, .md, .gen and .sms
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cartridge images and from .cue, .iso and .chd discs (MD.emu/metadata/conf.mk:5,
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MD.emu/src/main/system.ccm:91-101). A .sms name switches the machine to Power
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Base Converter mode (MD.emu/src/genplus-gx/loadrom.cc:383-387). Game Gear and
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SG-1000 sit inside #if 0 blocks in the renderer with no SYSTEM_GG or SYSTEM_SG
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defined anywhere in the tree (MD.emu/src/genplus-gx/vdp_render.cc:934-962,974-989,
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MD.emu/src/genplus-gx/system.h:35-40).
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The CD boot ROM is the one file the user supplies and it carries no name of its
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own. Three pickers store arbitrary URIs under USA CD BIOS, Japan CD BIOS and
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Europe CD BIOS, filtered on the cartridge extensions
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(MD.emu/src/main/EmuMenuViews.cc:289-346, MD.emu/src/main/system.ccm:84-86,136,
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MD.emu/src/main/options.cc:57-61,86-90). Loading a disc picks one of the three by
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region: the Game Region setting when it is not Auto, otherwise byte 0x20b of the
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boot sector, 0x7a for USA, 0x64 for Europe, anything else Japan
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(MD.emu/src/main/Main.cc:254-264,311-332,
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MD.emu/src/main/EmuMenuViews.cc:132-144,167-170, MD.emu/src/main/options.cc:31).
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An empty path ends the load with "Set a {} BIOS in the Options" and a failed read
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with "Error loading BIOS" (MD.emu/src/main/Main.cc:333-339). The file goes into
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the cartridge buffer, and a path ending in .zip, .7z or .rar is scanned instead,
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the first entry with a cartridge extension being taken
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(MD.emu/src/main/Main.cc:337,
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imagine/src/base/common/ApplicationContext.cc:542-562,
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imagine/src/fs/ArchiveFS.cc:75-78). init_rom accepts the image only at exactly
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131072 bytes with "BOOT" at 0x124 or 0x128 of the raw bytes, which is what raises
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sCD.isActive, and anything else ends the load with "Invalid BIOS"
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(MD.emu/src/genplus-gx/loadrom.cc:426-432, MD.emu/src/main/Main.cc:340-344).
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Cartridge content never reads it.
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No other boot ROM exists here. t_config has no bios field
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(MD.emu/src/genplus-config.h:46-54), the Master System mapper table names BIOS
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only in two game titles (MD.emu/src/genplus-gx/cart_hw/sms_cart.cc:119,126), and
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the TMSS OS ROM is copied out of the loaded image rather than read
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from a file, behind a config.tmss bit nothing turns on
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(MD.emu/src/genplus-gx/genesis.cc:313-320,
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MD.emu/src/genplus-gx/mem68k.cc:471-476). Upstream's load_bios and the
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bios_CD_U.bin, bios_CD_E.bin and bios_CD_J.bin names it opens have no counterpart
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in this tree (upstream core/loadrom.c:394-415,
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upstream libretro/libretro.c:3416-3418).
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The lock-on ROMs read nothing. osd.h keeps upstream's ggenie.bin, areplay.bin,
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sk.bin and sk2chip.bin paths and all three loaders are compiled
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(MD.emu/src/osd.h:13-16, MD.emu/src/genplus-gx/cart_hw/ggenie.cc:43-49,
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MD.emu/src/genplus-gx/cart_hw/areplay.cc:43-49,
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MD.emu/src/genplus-gx/cart_hw/md_cart.cc:499-531), but every one of them hangs off
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config.lock_on, which the value initialised config object leaves at zero and no
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code in the tree ever writes (MD.emu/src/main/AppMeta.cc:26,
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MD.emu/src/genplus-gx/cart_hw/md_cart.cc:499,702,850). There is no menu item and
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no config key for it (MD.emu/src/main/system.ccm:81-89), where the libretro port
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drives the same switch from a core option
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(upstream libretro/libretro.c:1715-1721).
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Per content the app writes and reads files named after the ROM: .srm cartridge
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backup memory, .brm CD backup memory it formats itself when absent
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(MD.emu/src/main/Main.cc:93-101,124-233), .gp states
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(MD.emu/src/main/system.ccm:162) and a .pat cheat list under the cheats path
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(MD.emu/src/main/Cheats.cc:388-391,438-441). Settings live in MdEmu.config
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(MD.emu/src/main/AppMeta.cc:34). Mednafen's image reader picks up an .sbi beside a
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cue sheet when one is present
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(EmuFramework/src/shared/mednafen/cdrom/CDAccess_Image.cpp:928-943), and
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gpOverlay.png and the shader sources are drawn by the framework from the
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application bundle (EmuFramework/include/emuframework/AssetManager.hh:61-66,
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EmuFramework/src/AssetManager.cc:58-73, MD.emu/src/main/AppMeta.cc:188-199).
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files:
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- name: bios_CD_U.bin
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system: sega-megacd
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region: [north-america, latin-america]
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required: true
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agnostic: true
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size: 131072
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validation: [size, signature]
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config_key: "CFGKEY_MD_CD_BIOS_USA_PATH"
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description: "Sega CD boot ROM read for the USA region"
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note: >-
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Picked by the user from any path, under any name ending in .bin, .smd, .md,
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.gen or .sms, or inside a .zip, .7z or .rar holding one. The tests are the
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length and the "BOOT" text at 0x124 or 0x128, and a file failing either aborts
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the load rather than falling back.
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source_ref: "source MD.emu/src/main/Main.cc:311-344 (region choice, read, checks), source MD.emu/src/genplus-gx/loadrom.cc:426-432 (size and signature), source MD.emu/src/main/EmuMenuViews.cc:290-295, 317-345 (picker and filter)"
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- name: bios_CD_J.bin
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system: sega-megacd
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region: [japan]
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required: true
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agnostic: true
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size: 131072
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validation: [size, signature]
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config_key: "CFGKEY_MD_CD_BIOS_JPN_PATH"
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description: "Mega CD boot ROM read for the Japan region"
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note: >-
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Taken by the default branch: USA and Europe go to the other two paths and
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every other region code lands here, both Japanese ones included.
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source_ref: "source MD.emu/src/main/Main.cc:311-344 (region choice, read, checks), source MD.emu/src/genplus-gx/loadrom.cc:426-432 (size and signature), source MD.emu/src/main/EmuMenuViews.cc:290-295, 317-345 (picker and filter)"
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- name: bios_CD_E.bin
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system: sega-megacd
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region: [europe, oceania]
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required: true
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agnostic: true
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size: 131072
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validation: [size, signature]
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config_key: "CFGKEY_MD_CD_BIOS_EUR_PATH"
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description: "Mega CD boot ROM read for the Europe region"
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note: >-
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Reached when the boot sector byte at 0x20b is 0x64 or the Game Region
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setting is Europe.
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source_ref: "source MD.emu/src/main/Main.cc:311-344 (region choice, read, checks), source MD.emu/src/genplus-gx/loadrom.cc:426-432 (size and signature), source MD.emu/src/main/EmuMenuViews.cc:290-295, 317-345 (picker and filter)"
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