mirror of
https://github.com/Abdess/retroarch_system.git
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106 lines
5.7 KiB
YAML
106 lines
5.7 KiB
YAML
emulator: "Lynx.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://mednafen.github.io/"
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profiled_date: "2026-08-11"
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source_commit: "1c12fac5ce49badaadff2e2f210dcc30b89f4943"
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core_version: "1.5.85"
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display_name: "Atari - Lynx (Lynx.emu)"
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mode: standalone
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cores:
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- "lynx-emu"
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- "Lynx.emu"
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- "LYNX-EMU"
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systems:
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- atari-lynx
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notes: |
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Member of the EX Emulator series by Robert Broglia, which targets Android and
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Linux (README.md:3-4,12-13) and keeps iOS and Pandora build shortcuts in the
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tree (Lynx.emu/ios.mk, Lynx.emu/pandora.mk). Published as
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com.explusalpha.LynxEmu (Lynx.emu/metadata/conf.mk:2,6,7) and reached by ES-DE
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through its LYNX-EMU find rule. Mednafen's Lynx module, itself derived from
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Handy by K. Wilkins, is vendored under Lynx.emu/src/lynx
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(Lynx.emu/metadata/conf.mk:8, Lynx.emu/src/main/AppMeta.cc:26) and driven by
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the app's own video, audio and input layers. The vendored copy declares
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Mednafen 1.32.0-UNSTABLE
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(EmuFramework/include/shared/mednafen/mednafen-config.h:167); the upstream
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comparisons below are against the 1.32.1 release. Content is read from .lnx,
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.lyx and .o files (Lynx.emu/metadata/conf.mk:5,
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Lynx.emu/src/main/AppMeta.cc:30), and the module also takes a headerless image
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of 128, 256 or 512 KB, a filetype upstream rejects
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(Lynx.emu/src/lynx/system.cpp:90-91,112; mednafen src/lynx/system.cpp:86-93).
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The boot ROM is the one file the user supplies and it carries no name of its
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own. The picker takes any name ending in .img and stores the chosen URI in
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biosPath (Lynx.emu/src/main/EmuMenuViews.cc:32-50,
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Lynx.emu/src/main/system.ccm:70, Lynx.emu/src/main/options.cc:33,55).
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MDFN_MakeFName returns that URI for MDFNMKF_FIRMWARE and drops the
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lynxboot.img name the module hands it, the name upstream resolves in its
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firmware directory (Lynx.emu/src/main/options.cc:150-154,
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Lynx.emu/src/lynx/system.cpp:103; mednafen src/lynx/system.cpp:101). CRom
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opens the file only when the path is not empty and throws unless it is exactly
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512 bytes (Lynx.emu/src/lynx/rom.cpp:75-95). Upstream has neither test: it
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opens whatever the firmware directory yields and takes 512 bytes or more
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(mednafen src/lynx/rom.cpp:55-74). A path that is set but cannot be opened, or
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that is the wrong length, aborts the content load rather than falling back
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(EmuFramework/src/shared/mednafen-emuex/StreamImpl.cc:53-63,
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Lynx.emu/src/lynx/system.cpp:337-342).
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With no path mValid stays false (Lynx.emu/src/lynx/rom.h:77) and Reset builds a
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stub boot ROM in place: 512 bytes of 0x88, the reset vectors, and STA $FD97 at
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$FE00, $FE19, $FE4A and $FF80 (Lynx.emu/src/lynx/rom.cpp:55-72,
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Lynx.emu/src/lynx/rom.h:50, Lynx.emu/src/lynx/system.cpp:241-263). A write to
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that register from inside the ROM window dispatches to the four HLE routines
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(Lynx.emu/src/lynx/mikie.cpp:1033-1053), which clear RAM, pull the encrypted
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loader blocks off the cartridge shifter, run them through lynx_decrypt and jump
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to $0200 (Lynx.emu/src/lynx/system.cpp:150-208,
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Lynx.emu/src/lynx/lynxdec.cpp:265). Neither the stub nor lynxdec.cpp exists
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upstream, where the constructor reaches the throw and Reset carries the
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homebrew branch alone (mednafen src/lynx/system.cpp:169-177).
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No hash is checked. The module holds no crc32 table, and its only md5 use is
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the content hash that names saves and states (Lynx.emu/src/lynx/cart.cpp:
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245-264, Lynx.emu/src/lynx/system.cpp:313,319). The custom palette entry
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survives in the module table and reaches nothing: Lynx_SetPixelFormat passes an
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empty span where upstream Emulate passes espec->CustomPalette
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(Lynx.emu/src/lynx/system.cpp:352,555,583; mednafen src/lynx/system.cpp:
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267,298), the app calls MDFNGI::Load directly instead of going through the
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Mednafen frontend that reads .pal files
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(EmuFramework/src/shared/mednafen-emuex/MDFNUtils.hh:133-145,
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Lynx.emu/src/main/Main.cc:62-65), and the frame spec is value-initialised so
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CustomPalette stays null
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(EmuFramework/src/shared/mednafen-emuex/MDFNUtils.hh:153,
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EmuFramework/src/shared/mednafen/git.h:399). Cheats answer false against
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CheatInfo_Empty (Lynx.emu/src/main/options.cc:126-127,
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Lynx.emu/src/lynx/system.cpp:586), no Cheats.cc is in the build
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(Lynx.emu/src/CMakeLists.txt:6-21), and the app declares no bundled content,
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the framework definition defaulting to an empty span
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(EmuFramework/src/AppMeta.cc:40,
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EmuFramework/include/emuframework/AppMeta.hh:66-68).
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MDFN_MakeFName is called once and only for the firmware, so the module asks for
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no save file (Lynx.emu/src/lynx/system.cpp:103). What the app writes is .mca
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states (Lynx.emu/src/main/system.ccm:86, Lynx.emu/src/main/Main.cc:47-54) and
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LynxEmu.config (Lynx.emu/src/main/AppMeta.cc:27). ui.png, gpOverlay.png and the
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shader sources are drawn by the framework from the application bundle
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(EmuFramework/include/emuframework/AssetManager.hh:61-65,
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EmuFramework/src/AssetManager.cc:58-65,
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EmuFramework/src/VideoImageEffect.cc:164-172).
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files:
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- name: lynxboot.img
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system: atari-lynx
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required: false
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hle_fallback: true
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has_builtin: true
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size: 512
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validation: [size]
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description: "Atari Lynx boot ROM"
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note: >-
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Picked by the user from any path, under any name ending in .img. The length
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is the only test and a file of another length aborts the load rather than
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falling back.
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source_ref: "Lynx.emu/src/lynx/system.cpp:103 (firmware request), Lynx.emu/src/main/options.cc:150-154 (path comes from the picker), Lynx.emu/src/lynx/rom.cpp:75-95 (open and size test), Lynx.emu/src/main/EmuMenuViews.cc:32-50 (picker and extension filter), Lynx.emu/src/lynx/system.cpp:241-263 (stub boot ROM when absent)"
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