mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-04-13 12:22:33 -05:00
187 lines
6.7 KiB
YAML
187 lines
6.7 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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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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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 (libretro.cpp:1866). All files below are relative
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to system_dir/dc/.
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The prefix is determined by platform (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 (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 (sb_mem.cpp:59)
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Flash/NVRAM search pattern (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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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: "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: "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: "core/reios/reios.cpp:736-754"
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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: "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: "core/hw/naomi/naomi_roms.h:133-188"
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- name: "airlbios.zip"
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path: "dc/airlbios.zip"
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system: sega-naomi
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required: false
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note: "Airline Pilots Deluxe BIOS. epr-21802.ic27 (Export), epr-21801.ic27 (USA)."
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source_ref: "core/hw/naomi/naomi_roms.h:78-85"
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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: "core/hw/naomi/naomi_roms.h:96-103"
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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: "core/hw/naomi/naomi_roms.h:105-119"
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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: "core/hw/naomi/naomi_roms.h:121-131"
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- name: "naomigd.zip"
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path: "dc/naomigd.zip"
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system: sega-naomi
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required: false
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note: "NAOMI GD-ROM BIOS. Shares ROMs with naomi.zip (epr-21576h, epr-21578h, epr-21577h)."
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source_ref: "core/hw/naomi/naomi_roms.h:190-212"
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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: "core/hw/naomi/naomi_roms.h:87-94"
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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: "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: "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: "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: "core/nullDC.cpp:364-375"
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