mirror of
https://github.com/Abdess/retroarch_system.git
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639ff69d6c
a5200, prosystem (Atari 7800), atari800 (400/800/XL/XE), vice (C64/C128/VIC-20/Plus4/PET - 10 cores, all ROMs embedded), neocd (Neo Geo CD, 12 BIOS variants), beetle_pce (PC Engine, 6 files), beetle_pcfx (PC-FX), np2kai (PC-9801, 14 files + YM2608 samples), quasi88 (PC-8801, 13 ROMs + 3 hidden fonts), opera (3DO, 10 BIOS + 3 kanji) 31 total profiles. Cross-reference: 572 undeclared, 148 in repo.
48 lines
2.0 KiB
YAML
48 lines
2.0 KiB
YAML
emulator: a5200
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type: libretro
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source: "https://github.com/libretro/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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# a5200 is a dedicated Atari 5200 emulator forked from Atari800/Atari++ codebase.
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# It loads the official 5200 OS ROM from <system_dir>/5200.rom (2048 bytes, mapped
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# to memory at 0xF800-0xFFFF via MEMORY_InitialiseMachine).
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#
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# If 5200.rom is missing or the user selects "internal" via core option "a5200_bios",
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# the core falls back to Altirra 5200 OS, an open-source replacement compiled from
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# Altirra-3.20-test4 (altirra_5200_os.c). The fallback has reduced compatibility
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# compared to the original Atari OS ROM.
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#
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# BIOS loading (libretro.c:409-500):
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# 1. check_bios_variable() reads core option "a5200_bios" (official/internal)
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# 2. load_bios() attempts to read <system_dir>/5200.rom (0x800 bytes)
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# 3. On failure or "internal" selected: memcpy from ROM_altirra_5200_os fallback
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#
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# Cartridge detection (atari.c:169-236):
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# Auto-detects cart type from header bytes and size. ROM database in cartridge.c
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# maps MD5 hashes to cart types (standard 8K/16K/32K/40K, bounty bob, super cart).
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files:
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- name: "5200.rom"
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path: "5200.rom"
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size: 2048
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required: false
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note: >
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Atari 5200 OS ROM. Provides the built-in OS routines used by all 5200
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cartridges. Without it, the core uses the Altirra open-source replacement
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which has lower compatibility with some games. Core option "a5200_bios"
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controls whether to use this file or the internal fallback.
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source_ref: "libretro/libretro.c:58-59, libretro/libretro.c:409-500, emu/memory.c:46"
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notes:
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altirra_fallback: >
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The built-in Altirra 5200 OS (from altirra_5200_os.c, 0x800 bytes) is a free
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replacement that works for most games but some titles require the original ROM
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for full compatibility. The core displays a notification when falling back.
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cart_db: >
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cartridge.c contains an MD5-based ROM database for automatic cart type detection
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(standard, EE banked, bounty bob, super cart variants). Unknown ROMs are detected
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by size heuristic.
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