mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-10-24 12:49:03 -05:00
Abdessamad Derraz
5a6e11bb8b
AmberELEC builds navy1978/flycast2022-lowend bf93aece and installs it as flycast2021le.
181 lines
7.6 KiB
YAML
181 lines
7.6 KiB
YAML
emulator: "Flycast 2022 Low-End"
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type: libretro
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core_classification: enhanced_fork
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source: "https://github.com/navy1978/flycast2022-lowend"
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upstream: "https://github.com/libretro/parallel-dc"
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profiled_date: "2026-10-22"
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source_commit: "bf93aece5db7050667075a1107ab380856b44a23"
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upstream_commit: "4c293f306bc16a265c2d768af5d0cea138426054"
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core_version: "0.1"
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display_name: "Sega - Dreamcast/Naomi (Flycast 2021 LE)"
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cores:
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- "flycast2021le"
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built_by: [amberelec]
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systems:
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- sega-dreamcast
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- sega-naomi
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- sega-atomiswave
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notes: |
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The libretro/flycast tree of 6 April 2022 (4c293f30, the repository now
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answers as libretro/parallel-dc) with 21 commits by navy1978 on top that add
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optional CPU, renderer and audio paths for RK3326/RK3566 handhelds. None of
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them touches the code that opens system files.
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AmberELEC builds this revision, renames the core option prefix from reicast
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to flycast2021le and installs the library as flycast2021le_libretro.so.
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ref: AmberELEC packages/games/libretro/flycast2021le/package.mk:5,19,50
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Every system file lives in <system>/dc/.
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ref: core/libretro/libretro.cpp:2189-2193
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Dreamcast: the boot ROM is looked for as dc_boot.bin, dc_boot.bin.bin,
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dc_bios.bin, dc_bios.bin.bin, the first that yields a full 2 MB read wins.
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The HLE BIOS core option defaults to disabled. When no boot ROM loads, reios
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boots the disc instead. Booting to the BIOS menu, or starting without a disc,
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needs the real boot ROM and fails with -3 without it.
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ref: core/hw/holly/sb_mem.cpp:51-65, core/hw/holly/sb_mem.cpp:215-233,
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core/hw/flashrom/flashrom.h:54-67, core/hw/flashrom/flashrom.h:84-118,
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core/nullDC.cpp:420-431, core/nullDC.cpp:455-463,
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core/libretro/libretro_core_options.h:226-239, core/libretro/libretro.cpp:885-890
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NAOMI and Atomiswave: a BIOS archive is opened as <system>/dc/<name> with .7z
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then .zip appended. Each member is looked for in the game archive, its parent,
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then the BIOS archive, by CRC32 and then by name. The BIOS table carries no
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CRC32, so only the name matches. The member for the configured region is
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tried first, then the first member listed. A game whose table entry names a
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BIOS refuses to start without it, and the others default to naomi. Five archive
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names are reachable from the game table: naomi, awbios, f355bios, f355dlx,
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hod2bios. airlbios and naomigd have table entries but no game names them.
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ref: core/hw/naomi/naomi_cart.cpp:77-180, core/hw/naomi/naomi_cart.cpp:227-247,
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core/archive/archive.cpp:26-42, core/hw/naomi/naomi_roms.h:76-213
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LoadRomFiles also reads naomi_boot.bin, naomi_boot.bin.bin, naomi_bios.bin,
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naomi_bios.bin.bin and epr-21576d.bin for NAOMI, but naomi_cart_LoadRom calls
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naomi_cart_Close, which clears bios_loaded, before the cartridge loads, so
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that file never stands in for naomi.zip.
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ref: core/hw/holly/sb_mem.cpp:59, core/nullDC.cpp:432-435, core/nullDC.cpp:77-81,
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core/hw/naomi/naomi_cart.cpp:427-450, core/hw/naomi/naomi_cart.cpp:473-485
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files:
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- name: "dc_boot.bin"
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path: "dc/dc_boot.bin"
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aliases: ["dc_boot.bin.bin", "dc_bios.bin", "dc_bios.bin.bin"]
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system: sega-dreamcast
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required: false
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hle_fallback: true
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min_size: 2097152
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validation: [size]
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description: "Dreamcast boot ROM"
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note: "Read as 2 MB into the system ROM, and a shorter file is rejected. Needed only to boot to the BIOS menu or to start without a disc."
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source_ref: "source core/hw/holly/sb_mem.cpp:51-65, source core/hw/holly/sb_mem.cpp:215-229, source core/hw/flashrom/flashrom.h:54-67, source core/nullDC.cpp:420-431"
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- name: "dc_nvmem.bin"
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path: "dc/dc_nvmem.bin"
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aliases: ["dc_flash_wb.bin", "dc_flash.bin", "dc_flash.bin.bin"]
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system: sega-dreamcast
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required: false
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min_size: 131072
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validation: [size]
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description: "Dreamcast flash ROM"
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note: "Loaded with the boot ROM and by the HLE path. A missing file leaves the flash blank and the core runs. Written back as dc_nvmem.bin."
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source_ref: "source core/hw/holly/sb_mem.cpp:196-213, source core/hw/holly/sb_mem.cpp:231, source core/hw/holly/sb_mem.cpp:236-243, source core/hw/holly/sb_mem.cpp:271-278"
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- name: "font.bin"
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path: "dc/font.bin"
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system: sega-dreamcast
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required: false
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description: "Dreamcast system font for the HLE BIOS"
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note: "Read whole into the font table of the reios ROM image. Absent, a built-in font is copied there."
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source_ref: "source core/reios/reios.cpp:736-755"
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- name: "naomi.zip"
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path: "dc/naomi.zip"
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category: bios_zip
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system: sega-naomi
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required: true
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description: "NAOMI BIOS archive"
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note: "Default BIOS of every NAOMI game whose table entry names none, cartridge, .lst, .bin and .dat images alike. One member is loaded: the one for the configured region, else epr-21576h.ic27."
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source_ref: "source core/hw/naomi/naomi_roms.h:132-189, source core/hw/naomi/naomi_cart.cpp:227-247, source core/hw/naomi/naomi_cart.cpp:473-485"
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contents:
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- name: "epr-21576h.ic27"
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size: 2097152
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description: "Japan"
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- name: "epr-21578h.ic27"
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size: 2097152
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description: "Export"
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- name: "epr-21577h.ic27"
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size: 2097152
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description: "USA"
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- name: "epr-21579d.ic27"
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size: 2097152
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description: "Korea"
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- name: "awbios.zip"
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path: "dc/awbios.zip"
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category: bios_zip
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system: sega-atomiswave
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required: true
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description: "Atomiswave BIOS archive"
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note: "Named by all 34 Atomiswave games. Loaded into the flash chip, whose writable part is then reloaded from the save directory."
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source_ref: "source core/hw/naomi/naomi_roms.h:86-94, source core/hw/naomi/naomi_cart.cpp:89-93, source core/hw/naomi/naomi_cart.cpp:171-173"
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contents:
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- name: "bios0.ic23"
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size: 131072
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- name: "f355bios.zip"
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path: "dc/f355bios.zip"
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category: bios_zip
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system: sega-naomi
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required: true
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description: "Ferrari F355 Challenge BIOS archive"
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note: "Named by three Ferrari F355 Challenge entries, which refuse to start without it."
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source_ref: "source core/hw/naomi/naomi_roms.h:95-103, source core/hw/naomi/naomi_cart.cpp:238-243"
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contents:
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- name: "epr-22851.ic27"
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size: 2097152
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description: "Export"
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- name: "epr-22850.ic27"
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size: 2097152
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description: "USA"
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- name: "epr-22849.ic27"
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size: 2097152
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description: "Japan"
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- name: "f355dlx.zip"
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path: "dc/f355dlx.zip"
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category: bios_zip
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system: sega-naomi
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required: true
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description: "Ferrari F355 Challenge Deluxe BIOS archive"
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note: "Named by the f355 entry, which refuses to start without it."
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source_ref: "source core/hw/naomi/naomi_roms.h:104-119, source core/hw/naomi/naomi_roms.h:1701, source core/hw/naomi/naomi_cart.cpp:238-243"
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contents:
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- name: "epr-21864.ic27"
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size: 2097152
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description: "Export"
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- name: "epr-21863.ic27"
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size: 2097152
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description: "USA"
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- name: "epr-21862.ic27"
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size: 2097152
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description: "Japan"
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- name: "hod2bios.zip"
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path: "dc/hod2bios.zip"
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category: bios_zip
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system: sega-naomi
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required: true
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description: "The House of the Dead 2 BIOS archive"
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note: "Named by four House of the Dead 2 entries, which refuse to start without it."
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source_ref: "source core/hw/naomi/naomi_roms.h:120-131, source core/hw/naomi/naomi_cart.cpp:238-243"
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contents:
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- name: "epr-21331.ic27"
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size: 2097152
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description: "Export"
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- name: "epr-21330.ic27"
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size: 2097152
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description: "USA"
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- name: "epr-21329.ic27"
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size: 2097152
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description: "Japan"
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