mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-04-13 12:22:33 -05:00
4bc7085c1c
snes9x (BS-X + STBIOS, HLE coprocessors), mupen64plus (64DD IPL), pcsx_rearmed (7 BIOS + dynamic scan fallback), stella (no BIOS), fmsx (12 MSX ROMs), virtualjaguar (6 BIOS embedded), sameboy (8 boot ROM types, all built-in), beetle_vb (no BIOS), handy (lynxboot.img 512B), pokemini (bios.min + FreeBIOS fallback) 61 total profiles. Cross-reference: 667 undeclared, 182 in repo.
55 lines
2.2 KiB
YAML
55 lines
2.2 KiB
YAML
emulator: Stella
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type: libretro
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source: "https://github.com/libretro/stella2014-libretro"
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cores:
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- stella
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- stella2014
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- stella2023
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systems:
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- atari-2600
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notes: |
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Stella is an Atari 2600 (VCS) emulator. The libretro port available is
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stella2014, which is a fork frozen at the 2014 codebase. The upstream
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"stella-libretro" repo redirects to stella2014-libretro. There is no
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separate stella2023 libretro core published at this time.
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The Atari 2600 console has no BIOS ROM. Games run directly on the
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hardware with no boot firmware.
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The Starpath/Arcadia Supercharger add-on had a 2K BIOS ROM on the
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physical hardware. Stella does NOT load this BIOS from an external
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file. Instead, the core contains a built-in dummy BIOS
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(ourDummyROMCode, 294 bytes in CartAR.cxx) that simulates the
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Supercharger load sequence. The initializeROM() function copies this
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dummy code into the ROM bank (bank 3) at reset, sets up the 6502
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reset vector to 0xF80A, and handles multiload via a hotspot at
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address 0x1850.
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The "fastscbios" setting (offset 109 in the dummy ROM) controls
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whether the SC load progress bars are shown (0x00) or skipped
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(0xFF). This is toggled automatically during ROM format detection
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(Console.cxx:119-120).
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The real Supercharger BIOS ROM (MD5 4565c1a7abce773e53c75b35414adefd)
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is recognized in DefProps.hxx as a known cartridge entry but is not
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required or loaded as a system file.
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The libretro interface (retro_set_environment) does not call
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RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY and declares no firmware
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requirements. No core option references BIOS loading.
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files: []
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platform_details:
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supercharger_emulation:
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source_ref: "stella/src/emucore/CartAR.cxx, CartAR.hxx"
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notes: |
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The Supercharger (type AR) uses 4 banks: 3x 2K RAM + 1x 2K ROM.
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The ROM bank is filled with ourDummyROMCode at reset. SC games
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are multi-load images (8448 bytes per load: 8192 data + 256 header).
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loadIntoRAM() handles loading game data when the hotspot at 0x1850
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is accessed with the ROM bank mapped. The bank switching byte and
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start address are written to zero-page RAM (0xFE, 0xFF, 0x80) for
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the dummy BIOS to read.
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