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https://github.com/Abdess/retroarch_system.git
synced 2026-04-13 12:22:33 -05:00
de1940d57c
Batch analysis of all 273 profiles to identify HLE/embedded fallbacks. Added hle_fallback: true where the core has verified software replacement for missing BIOS files: - Embedded ROMs: vice (102), ep128emu (22), fuse (18), frodo (4) - HLE BIOS: bsnes* (33 across 3 profiles), puae (9 AROS), noods (4), melonds* (6 FreeBIOS), flycast (3 reios) - Open-source replacements: sameboy (8), pokemini (1), gpsp (1) - Built-in fallbacks: np2kai (7), atari800 (6 Altirra), picodrive (3), quasi88 (4), gambatte (2) Conservative: only added where notes or source code confirm HLE. Skipped 50+ profiles where files are optional alternatives, not HLE replaceable (neocd, opera, kronos, pcem, etc.)
44 lines
1.9 KiB
YAML
44 lines
1.9 KiB
YAML
emulator: Handy
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type: libretro
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source: "https://github.com/libretro/libretro-handy"
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profiled_date: "2026-03-18"
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core_version: "0.95"
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display_name: "Atari - Lynx (Handy)"
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systems: [atari-lynx]
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notes: |
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Handy is an Atari Lynx emulator. The core loads lynxboot.img from
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the system directory and validates it by CRC32 (0x0D973C9D). If the
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file is missing or the CRC does not match, the core falls back to an
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internal HLE BIOS that replicates the boot sequence in software
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(ram clear, cart loader decrypt, jump to $0200).
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The HLE path intercepts CPU calls to ROM addresses FE00, FE19, FE4A
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and FF80 via a Mikie register write trap (address 0xFD97). When
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useEmu is true (no valid BIOS loaded), CRom initialises mRomData
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with a default fill byte (0x88) plus reset vectors pointing to
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the HLE entry points. The cart decryption uses a hardcoded RSA
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public key (lynxdec.cpp) identical to the real hardware.
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With the real BIOS, the first frame has unusually high cycle counts
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because hardware timers start from the boot ROM rather than being
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set artificially. Blip_Buffer::end_frame() caps the audio buffer
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to handle this overflow.
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File path: libretro.cpp retro_load_game() joins
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RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY with "lynxboot.img".
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No subdirectory.
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files:
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- name: "lynxboot.img"
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system: atari-lynx
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description: "Atari Lynx boot ROM (Mikie internal 512B ROM)"
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required: false
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hle_fallback: true
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size: 512
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md5: "fcd403db69f54290b51035d82f835e7b"
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sha1: "e4ed47fae31693e016b081c6bda48da5b70d7ccb"
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crc32: "0d973c9d"
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source_ref: "rom.h:48-49 (ROM_SIZE=0x200, ROM_CRC32=0xD973C9D), rom.cpp:76-128 (CRom constructor), libretro.cpp:1231-1258 (bios path + CSystem init)"
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notes: "Validated by CRC32 at load time. If invalid or missing, core uses HLE fallback (system.cpp HLE_BIOS_* functions). Games work without it but the real boot ROM provides accurate startup timing."
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