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.
215 lines
7.6 KiB
YAML
215 lines
7.6 KiB
YAML
emulator: Flycast
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type: standalone + libretro
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core_classification: official_port
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source: "https://github.com/libretro/flycast"
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upstream: "https://github.com/flyinghead/flycast"
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logo: "https://raw.githubusercontent.com/flyinghead/flycast/master/shell/linux/flycast.png"
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profiled_date: "2026-03-23"
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source_commit: "bde196bfbf541435d0e7d3e3fa91dbd154e7c502"
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core_version: "0.1"
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display_name: "Sega - Dreamcast/Naomi (Flycast)"
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cores:
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- flycast
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- flycast_dev
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- flycastvl
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- "flycast-next"
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systems:
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- sega-dreamcast
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- sega-naomi
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- sega-naomi2
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- sega-atomiswave
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notes: |
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Flycast has a built-in HLE BIOS (reios) for Dreamcast that can boot most
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games without real BIOS files. Arcade systems (NAOMI, Atomiswave) require
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MAME-format BIOS ROM archives.
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The libretro port (libretro/flycast, last updated 2025-12-12) is significantly
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behind upstream (flyinghead/flycast). Key divergences:
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- NAOMI 2 has no separate BIOS entry or platform detection: NAOMI 2 games
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run as NAOMI using naomi.zip. Upstream has naomi2.zip with dedicated ROMs.
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- System SP is not supported. Upstream has segasp.zip support.
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- The n2_ prefix for NAOMI 2 flat boot ROMs is dead code (DC_PLATFORM_NAOMI2
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is never assigned to settings.System in the libretro port).
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- Flash search includes legacy names (%flash_wb.bin, %flash.bin, %flash.bin.bin)
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that upstream has removed.
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- NAOMI flat boot ROM search includes epr-21576d.bin fallback not in upstream.
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BIOS file search uses prefix + name pattern. The libretro port appends "dc/"
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to the system directory (core/libretro/libretro.cpp:1972). All files below are relative
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to system_dir/dc/.
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The prefix is determined by platform (core/hw/holly/sb_mem.cpp:32-49):
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Dreamcast -> dc_
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Dev Unit -> hkt_
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NAOMI -> naomi_
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Atomiswave -> (no prefix, BIOS loaded from awbios.zip)
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Boot ROM search pattern (core/hw/holly/sb_mem.cpp:51-68):
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{prefix}boot.bin, {prefix}boot.bin.bin, {prefix}bios.bin, {prefix}bios.bin.bin
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NAOMI also tries: epr-21576d.bin (core/hw/holly/sb_mem.cpp:59)
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Flash/NVRAM search pattern (core/hw/holly/sb_mem.cpp:231):
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{prefix}nvmem.bin, {prefix}flash_wb.bin, {prefix}flash.bin, {prefix}flash.bin.bin
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BIOS[] also declares airlbios and naomigd. No entry of Games[] carries
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either name in its bios field and naomi_LoadBios is only ever called with
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that field or the literal naomi, so neither archive is opened.
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ref: core/hw/naomi/naomi_cart.cpp:79,229-240,476-479, core/hw/naomi/naomi_roms.h:79,191
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files:
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# -------------------------------------------------------
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# Sega Dreamcast
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# -------------------------------------------------------
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- name: "dc_boot.bin"
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path: "dc/dc_boot.bin"
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aliases: ["dc_bios.bin", "dc_boot.bin.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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size: 2097152
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note: "Dreamcast boot ROM. HLE BIOS (reios) used as fallback. Code searches prefix + boot.bin, boot.bin.bin, bios.bin, bios.bin.bin sequentially."
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source_ref: "upstream core/hw/holly/sb_mem.cpp:219, 55-57"
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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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hle_fallback: true
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size: 131072
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note: "Dreamcast flash memory / NVRAM. Created if not found. Code searches prefix + nvmem.bin, flash_wb.bin, flash.bin, flash.bin.bin sequentially."
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source_ref: "upstream core/hw/holly/sb_mem.cpp:231, 196-213"
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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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note: "Dreamcast system font for HLE BIOS text rendering. Built-in font used as fallback."
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source_ref: "upstream core/reios/reios.cpp:737-753"
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# -------------------------------------------------------
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# Sega NAOMI
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# -------------------------------------------------------
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- name: "naomi_boot.bin"
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path: "dc/naomi_boot.bin"
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aliases: ["naomi_bios.bin", "naomi_boot.bin.bin", "naomi_bios.bin.bin", "epr-21576d.bin"]
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system: sega-naomi
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required: false
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size: 2097152
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note: "NAOMI boot ROM (flat binary). Alternative to naomi.zip. epr-21576d.bin is searched without prefix."
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source_ref: "upstream core/hw/holly/sb_mem.cpp:219, 58-59"
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- name: "naomi.zip"
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path: "dc/naomi.zip"
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system: sega-naomi
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required: true
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note: >
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NAOMI system BIOS archive (MAME format). Contains region-specific
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BIOS ROMs: epr-21576h.ic27 (Japan), epr-21577h.ic27 (USA),
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epr-21578h.ic27 (Export), epr-21579d.ic27 (Korea).
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Also used for NAOMI 2 games in the libretro port (no separate naomi2.zip).
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source_ref: "source core/hw/naomi/naomi_roms.h:133-188"
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contents:
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- name: "epr-21576h.ic27"
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size: 2097152
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- name: "epr-21578h.ic27"
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size: 2097152
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- name: "epr-21577h.ic27"
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size: 2097152
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- name: "epr-21579d.ic27"
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size: 2097152
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- name: "f355bios.zip"
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path: "dc/f355bios.zip"
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system: sega-naomi
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required: false
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note: "Ferrari F355 Challenge BIOS. Japan/USA/Export variants."
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source_ref: "source core/hw/naomi/naomi_roms.h:96-103"
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contents:
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- name: "epr-22851.ic27"
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size: 2097152
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- name: "epr-22850.ic27"
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size: 2097152
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- name: "epr-22849.ic27"
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size: 2097152
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- name: "f355dlx.zip"
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path: "dc/f355dlx.zip"
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system: sega-naomi
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required: false
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note: "Ferrari F355 Challenge Deluxe BIOS. Japan/USA/Export variants."
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source_ref: "source core/hw/naomi/naomi_roms.h:105-119"
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contents:
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- name: "epr-21864.ic27"
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size: 2097152
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- name: "epr-21863.ic27"
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size: 2097152
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- name: "epr-21862.ic27"
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size: 2097152
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- name: "hod2bios.zip"
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path: "dc/hod2bios.zip"
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system: sega-naomi
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required: false
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note: "House of the Dead 2 BIOS. Japan/USA/Export variants."
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source_ref: "source core/hw/naomi/naomi_roms.h:121-131"
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contents:
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- name: "epr-21331.ic27"
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size: 2097152
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- name: "epr-21330.ic27"
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size: 2097152
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- name: "epr-21329.ic27"
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size: 2097152
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# -------------------------------------------------------
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# Sega Atomiswave
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# -------------------------------------------------------
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- name: "awbios.zip"
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path: "dc/awbios.zip"
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system: sega-atomiswave
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required: true
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note: "Atomiswave system BIOS archive (MAME format). Contains bios0.ic23 (Sammy, 128 KB)."
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source_ref: "upstream core/hw/naomi/naomi_roms.h:87-94"
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contents:
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- name: "bios0.ic23"
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size: 131072
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# -------------------------------------------------------
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# Not supported by libretro port
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# -------------------------------------------------------
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# naomi2.zip: no BIOS[] entry in libretro fork (naomi_roms.h). NAOMI 2 games
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# use the "naomi" BIOS. naomi_cart_GetSystemType() never returns
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# DC_PLATFORM_NAOMI2. Upstream has full naomi2.zip support.
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#
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# segasp.zip: no System SP support in libretro fork. Upstream has full support.
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platform_details:
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dreamcast:
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bios_size: 2097152
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flash_size: 131072
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ram_size: 16777216
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hle_available: true
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source_ref: "source core/nullDC.cpp:333-345"
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naomi:
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bios_size: 2097152
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sram_size: 32768
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ram_size: 33554432
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hle_available: false
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source_ref: "source core/nullDC.cpp:346-354"
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naomi2:
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bios_size: 2097152
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sram_size: 32768
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ram_size: 33554432
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hle_available: false
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note: "Treated as NAOMI in the libretro port. Separate platform only in upstream."
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source_ref: "source core/nullDC.cpp:355-363"
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atomiswave:
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bios_size: 131072
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sram_size: 131072
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ram_size: 16777216
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hle_available: false
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source_ref: "source core/nullDC.cpp:364-375"
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