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.
46 lines
1.8 KiB
YAML
46 lines
1.8 KiB
YAML
emulator: a5200
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type: libretro
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core_classification: community_fork
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source: "https://github.com/libretro/a5200"
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upstream: "https://github.com/alekmaul/a5200"
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profiled_date: "2026-03-22"
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source_commit: "40c6f2f1ad4a3145b328d5baaf010fae6c7e752b"
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core_version: "2.0.2"
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display_name: "Atari - 5200 (a5200)"
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cores:
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- a5200
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systems:
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- atari-5200
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# Dedicated Atari 5200 emulator forked from Atari800 2.0.2 codebase by Alekmaul
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# for GCW Zero. Libretro port later enhanced by wavemotion-dave with Altirra OS
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# fallback, Super Cart support, frame blending and analog input.
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#
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# Loads 5200 OS ROM from <system_dir>/5200.rom (2048 bytes, mapped to 0xF800-0xFFFF
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# via MEMORY_InitialiseMachine). If missing or user selects "internal" via core
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# option "a5200_bios", falls back to built-in Altirra 5200 OS (altirra_5200_os.c,
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# compiled from Altirra-3.20-test4).
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#
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# BIOS loading (libretro.c:408-499):
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# 1. check_bios_variable() reads core option "a5200_bios" (official/internal)
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# 2. load_bios() reads <system_dir>/5200.rom, validates size == 0x800
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# 3. On failure or "internal" selected: memcpy from ROM_altirra_5200_os
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#
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# Upstream divergence: alekmaul's standalone requires 5200.rom (exits on missing).
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# Libretro port makes it optional via Altirra fallback.
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#
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# Cart type detection via MD5 database in cartridge.c (standard 4K-512K, bounty bob,
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# super cart, EE banked). Unknown ROMs detected by size heuristic.
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files:
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- name: "5200.rom"
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path: "5200.rom"
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min_size: 2048
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required: false
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hle_fallback: true
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validation: [size]
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note: >
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Atari 5200 OS ROM. Core option "a5200_bios" controls official vs internal.
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Altirra replacement has lower compatibility with some titles.
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source_ref: "source libretro/libretro.c:58-59, source libretro/libretro.c:416-507, source libretro/libretro.c:456-468, source emu/memory.c:46"
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