mirror of
https://github.com/Abdess/retroarch_system.git
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Abdessamad Derraz
d76c76e41e
Linkboy 4.0.0 keeps the three firmware slots, sizes, md5 table and loader behaviour of 3.11.4. Class names and library addresses are re-read from the 4.0.0 Play build, and the firmware import path is documented.
120 lines
6.0 KiB
YAML
120 lines
6.0 KiB
YAML
emulator: Linkboy
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type: standalone
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core_classification: embedded_hle
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source: "https://play.google.com/store/apps/details?id=com.pixelrespawn.linkboy"
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upstream: closed-source
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version_source:
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url: "https://play.google.com/store/apps/details?id=com.pixelrespawn.linkboy&hl=en"
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pattern: '\[\[\["([^"]+)"\]\],\[\[\[\d+'
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author: "Pixel Respawn LLC"
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profiled_date: "2026-10-24"
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core_version: "4.0.0"
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display_name: "Nintendo - Game Boy / Color / Advance (Linkboy)"
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mode: standalone
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cores:
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- "linkboy"
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- "Linkboy"
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- "LINKBOY"
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systems:
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- nintendo-gb
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- nintendo-gbc
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- nintendo-gba
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- nintendo-sgb
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notes: |
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Android package com.pixelrespawn.linkboy, closed source, free on Google Play with a
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paid unlock, reached by ES-DE through its LINKBOY find rule. Four Play distribution
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builds are read here, 4.0.0 (versionCode 95, minSdk 26, targetSdk 37, xapk sha256
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9a10e00c6dcd2fdc66490000bf77bfa9846b37dffd31f8d96dc89d7c5997fee1), 3.11.4
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(versionCode 93, minSdk 32, targetSdk 36, xapk sha256
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4432cf9ab8ce2d148e8a0e89c26b786e4e7d060f43885d062f6d446b03ca4d32), 3.11.0
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(versionCode 86, minSdk 26, xapk sha256
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83b92276d28d71e491ebcbec3fa85cef42ef49d8ee0c6fd1bbe0045bc118f866) and 1.4.2
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(versionCode 12), all carrying the app signing certificate sha256
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feb643cfdd9c49f58eb325fde3d869cefcf59e45dfadb8e540beca35a7b1c28e and the Play
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distribution source stamp. Emulation lives in liblinkboy.so behind a JNI bridge.
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Addresses below are armeabi-v7a of 4.0.0 (liblinkboy.so sha256
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86334694df475bfba4ec312ef69ca71e45dfda65e51eb074660ca177d80c88f3) and class names
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are those of its obfuscated dex.
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Four subsystems are declared: GBA, GBC, GB and SGB (rd0.java:16-21). An SGB
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cartridge runs in GB mode when prefer-sgb is off (y72.java:43, i71.java:203-205,
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285-287).
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The three firmware images are the only files the emulator reads that it does not
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write itself. One table holds their names, sizes and md5 sums (uq.java:8), and the
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firmware screen reports each as present, mismatched or absent by comparing the
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size and then the md5 of the whole file (tq.java:22-85, t32.java:197-204).
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Importing a slot from that screen writes firmware/ and the name: a picked zip
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gives its first entry whose length equals the slot size, any other document is
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copied when its own length does (h.java:127-145, oq.java:58-167).
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Saves, cheats, thumbnails, keymaps and the ips, ups and bps patches picked up next
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to a ROM are written or supplied per game, not fixed files.
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An image is read only while the use-bios preference is on, which is off until set
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(y72.java:44, tf5.java:186-194, i71.java:207,289, b71.java:233). The loader appends
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/firmware/ and the name to the directory handed to setDataDir, the app's external
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files directory or its internal one when none is mounted (i71.java:74,
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qm3.java:32-41), and opens the result with fopen "rb".
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A file whose length is not exactly the expected size is closed and treated as
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absent, as is a short read. On success the loader returns the crc32 of the bytes
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(liblinkboy.so 0x1cb10-0x1cd1c, crc32 at 0x1c76c).
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A missing image stops nothing. The GBA path copies a 236 byte replacement bios
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compiled into the library over the 16 KB region and zero fills the remainder. Since
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3.11.4 a second variant of that replacement is taken when the game code is B4GJ or
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B4SJ (0x10a22c-0x10a2c8). The GB and GBC path hands the reset routine a boot rom
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present flag, false when no image was loaded, and the machine starts from its post
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boot state (0x14f9b4-0x14fa38, 0x14fab8-0x14fad4).
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Since 3.11.4 a loaded GBA image is not run for every cartridge. When the ROM is at
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least 0xa0 bytes the crc32 of the 156 header bytes from offset 4 is compared with a
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fixed value, and a mismatch logs "Invalid logo, skipping BIOS" and resets with the
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boot flag false. The image stays installed and the machine starts from its post
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boot state (0x10a2ec-0x10a364).
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Save states record the crc32 of the image they were made under. Loading a state
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whose value differs from the running machine re-reads the file and refuses the state
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when the crc32 still disagrees (0x10aecc-0x10af24, 0x1501b0-0x1501bc,
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0x150280-0x1502e4).
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files:
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- name: gba_bios.bin
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path: firmware/gba_bios.bin
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system: nintendo-gba
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required: false
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hle_fallback: true
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size: 16384
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md5: a860e8c0b6d573d191e4ec7db1b1e4f6
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validation: [size, md5]
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config_key: "use-bios"
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description: "Game Boy Advance BIOS"
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note: "Read into the 16 KB bios region when use-bios is on. Absent, mismatched in size or short, the region is filled with a replacement bios compiled into the library and zero padded. A cartridge whose header logo fails the crc32 test boots past it."
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source_ref: "Linkboy 4.0.0 uq.java:8, tq.java:22-85, liblinkboy.so 0x10a22c-0x10a2c8 (size argument 0x4000 at 0x10a260), 0x10a2ec-0x10a364 (logo test), loader 0x1cb10-0x1cd1c"
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- name: gbc_bios.bin
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path: firmware/gbc_bios.bin
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system: nintendo-gbc
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required: false
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hle_fallback: true
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size: 2304
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md5: dbfce9db9deaa2567f6a84fde55f9680
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validation: [size, md5]
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config_key: "use-bios"
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description: "Game Boy Color boot ROM"
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note: "Read when use-bios is on and the machine is a Game Boy Color. Without it the reset routine receives a false boot rom flag and the machine starts from its post boot state."
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source_ref: "Linkboy 4.0.0 uq.java:8, tq.java:22-85, liblinkboy.so 0x14fa20-0x14fa2c (size argument 0x900), 0x14fab8-0x14fad4, loader 0x1cb10-0x1cd1c"
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- name: gb_bios.bin
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path: firmware/gb_bios.bin
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system: nintendo-gb
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required: false
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hle_fallback: true
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size: 256
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md5: 32fbbd84168d3482956eb3c5051637f5
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validation: [size, md5]
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config_key: "use-bios"
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description: "Game Boy boot ROM"
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note: "Read when use-bios is on and the machine is a Game Boy. Without it the reset routine receives a false boot rom flag and the machine starts from its post boot state."
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source_ref: "Linkboy 4.0.0 uq.java:8, tq.java:22-85, liblinkboy.so 0x14fa0c-0x14fa18 (size argument 0x100), 0x14fab8-0x14fad4, loader 0x1cb10-0x1cd1c"
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