Libretro Flycast is a cross-platform Sega Dreamcast emulator capable of emulating the following systems:
- NAOMI M1
- NAOMI M2
- NAOMI M4
¶ 
License
This core is under GPLv2 license.
¶ 
Compatibility
| RPI0/RPI1 | RPI3 | RPI4/RPI400 | RPI5 | ODROID XU4 | OGA/OGS/RG351 | PC | RG353 |
|---|---|---|---|---|---|---|---|
| ❌ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
¶ 
Features
| Feature | Supported |
|---|---|
| Restart | ✔ |
| Screenshots | ✔ |
| Saves | ✔ |
| Core Options | ✔ |
| RetroArch Cheats | ✔ |
| Controls | ✔ |
| Remapping | ✔ |
| Rumble | ✔ |
| Disk Control | ✔ |
¶ 
BIOS
¶ Mandatory bios list
| Filename | Description | MD5 | Provided |
|---|---|---|---|
| naomi.zip | MAME format since Romset MAME 0.154 | eb4099aeb42ef089cfe94f8fe95e51f6 | ❌ |
¶ Optional bios list
| Filename | Description | MD5 | Provided |
|---|---|---|---|
| airlbios.zip | Naomi Airline Pilots deluxe Bios from MAME | 3f348c88af99a40fbd11fa435f28c69d | ❌ |
| hod2bios.zip | Naomi The House of the Dead 2 Bios from MAME | 9c755171b222fb1f4e1439d5b709dbf1 | ❌ |
¶ Location
Put your bios like this:
┣ 📁 recalbox
┃ ┣ 📁 share
┃ ┃ ┣ 📁 bios
┃ ┃ ┃ ┣ 📁 dc
┃ ┃ ┃ ┃ ┣ 🗒 naomi.zip
┃ ┃ ┃ ┃ ┣ 🗒 airlbios.zip
┃ ┃ ┃ ┃ ┣ 🗒 hod2bios.zip
¶ 
Roms
Flycast is based on the Romset of Mame but also on nullDC formats for its Naomi part.
¶ Mame Romset
Only Naomi romsets from a MAME romset 0.135 or higher are compatible !
We recommend the latest romset 0.235 which will bring its share of additional compatibility!
For more info on the current romset version: MameDev.
The dat file to sort your arcade roms is available in the folder
/recalbox/share/bios/dc/
¶ Romset NullDC
These roms are compatible with Flycast but less reliable than roms from a Mame Romset.
The NullDC roms are in the format:
.bin + .lst.
Example for the game cfield.zip :
/recalbox/share/roms/naomi/cfield/.../recalbox/share/roms/naomi/cfield/cfield.bin/recalbox/share/roms/naomi/cfield/cfield.lst
¶ Location
Put your roms like this:
┣ 📁 recalbox
┃ ┣ 📁 share
┃ ┃ ┣ 📁 roms
┃ ┃ ┃ ┣ 📁 naomi
┃ ┃ ┃ ┃ ┣ 🗒 game.zip
¶ 
Advanced configuration of the emulator
To be able to keep your custom configurations during an upgrade, we advise you to use our configuration override feature.
¶ Accessing to options
You can configure various options in two different ways.
- Via RetroArch menu:
┣ 📁 RetroArch Menu
┃ ┣ 📁 Core options
┃ ┃ ┣ 🧩 Name_option
- Via the file
retroarch-core-options.cfg:
┣ 📁 recalbox
┃ ┣ 📁 share
┃ ┃ ┣ 📁 system
┃ ┃ ┃ ┣ 📁 configs
┃ ┃ ┃ ┃ ┣ 📁 retroarch
┃ ┃ ┃ ┃ ┃ ┣ 📁 cores
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🧩 retroarch-core-options.cfg
¶ Core options
| Options | Options values | Variables (for configuration override) | Variables values |
|---|---|---|---|
| System Type (Restart) | Auto ✅ / Dreamcast / NAOMI / Atomiswave |
flycast_system |
auto / dreamcast / naomi / atomiswave |
| Internal resolution (restart) | 320x240 ✅ / 640x480 / 800x600 / 960x720 / 1024x768 / 1280x960 / 1440x1080 / 1600x1200 / 1920x1440 / 2560x1920 / 2880x2160 / 3200x2400 / 3840x2880 / 4480x3360 / 5120x3840 / 5760x4320 / ``6400x4800 / 7040x5280 / 7680x5760 / 8320x6240 / 8960x6720 / 9600x7200 / 10240x7680 / 10880x8160 / 11520x8640 / 12160x9120 / 12800x9600 |
flycast_internal_resolution |
320x240 / 640x480 / 800x600 / 960x720 / 1024x768 / 1280x960 / 1440x1080 / 1600x1200 / 1920x1440 / 2560x1920 / 2880x2160 / 3200x2400 / 3840x2880 / 4480x3360 / 5120x3840 / 5760x4320 / 6400x4800 / 7040x5280 / 7680x5760 / 8320x6240 / 8960x6720 / 9600x7200 / 10240x7680 / 10880x8160 / 11520x8640 / 12160x9120 / 12800x9600 |
| Screen Orientation | Horizontal ✅ / Vertical |
flycast_screen_rotation |
horizontal / vertical |
| Alpha Sorting | Per-Strip (fast, least accurate) / Per-Triangle (normal) ✅ |
flycast_alpha_sorting |
per-strip (fast, least accurate) / per-triangle (normal) |
| Mipmapping | Enabled ✅ / Disabled |
flycast_mipmapping |
enabled / disabled |
| Fog Effects | Enabled ✅ / Disabled |
flycast_fog |
enabled / disabled |
| Volume Modifier | Enabled ✅ / Disabled |
flycast_volume_modifier_enable |
enabled / disabled |
| Widescreen Hack (Restart) | Disabled ✅ / Enabled |
flycast_widescreen_hack |
disabled / enabled |
| Widescreen Cheats (Restart) | Disabled ✅ / Enabled |
flycast_widescreen_cheats |
disabled / enabled |
| Region | Default ✅ / Japan / USA / Europe |
flycast_region |
Default / Japan / USA / Europe |
| DIV Matching | Disabled / Auto ✅ |
flycast_div_matching |
disabled / auto |
| Analog Stick Deadzone | 0% / 5% / 10% / 15% ✅ / 20% / 25% / 30% |
flycast_analog_stick_deadzone |
0% / 5% / 10% / 15% / 20% / 25% / 30% |
| Trigger Deadzone | 0% ✅ / 5% / 10% / 15% / 20% / 25% / 30% |
flycast_trigger_deadzone |
0% / 5% / 10% / 15% / 20% / 25% / 30% |
| Digital Triggers | Disabled ✅ / Enabled |
flycast_digital_triggers |
disabled / enabled |
| Enable DSP | Disabled / Enabled ✅ |
flycast_enable_dsp |
disabled / enabled |
| Anisotropic Filtering | Off / 2 / 4 ✅ / 8 / 16 |
flycast_anisotropic_filtering |
disabled / 2 / 4 / 8 / 16 |
| PowerVR2 Post-processing Filter | Disabled ✅ / Enabled |
flycast_pvr2_filtering |
disabled / enabled |
| Texture Upscaling (xBRZ) | Off ✅ / 2 / 4 / 6 |
flycast_texupscale |
disabled / 2 / 4 / 6 |
| Enable RTT (Render To Texture) Buffer | Disabled ✅ / Enabled |
flycast_enable_rttb |
disabled / enabled |
| Render To Texture Upscaling | 1x ✅ / 2x / 3x / 4x / 8x |
flycast_render_to_texture_upscaling |
1x / 2x / 3x / 4x / 8x |
| Threaded Rendering (Restart) | Disabled / Enabled ✅ |
flycast_threaded_rendering |
disabled / enabled |
| Synchronous Rendering | Disabled / Enabled ✅ |
flycast_synchronous_rendering |
disabled / enabled |
| Delay Frame Swapping | Disabled ✅ / Enabled |
flycast_delay_frame_swapping |
disabled / enabled |
| Frame Skipping | Disabled ✅ / 1 / 2 / 3 / 4 / 5 / 6 |
flycast_frame_skipping |
off / 1 / 2 / 3 / 4 / 5 / 6 |
| Allow NAOMI Service Buttons | Disabled ✅ / Enabled |
flycast_allow_service_buttons |
disabled / enabled |
| Enable NAOMI 15KHz Dipswitch | Disabled ✅ / Enabled |
flycast_enable_naomi_15khz_dipswitch |
disabled / enabled |
| Load Custom Textures | Disabled ✅ / Enabled |
flycast_custom_textures |
disabled / enabled |
| Dump Textures | Disabled ✅ / Enabled |
flycast_dump_textures |
disabled / enabled |
| Show Light Gun Settings | Enabled / Disabled ✅ |
flycast_show_lightgun_settings |
enabled / disabled |
| Gun Crosshair 1 Display | Disabled ✅ / White / Red / Green / Blue |
flycast_lightgun1_crosshair |
disabled / White / Red / Green / Blue |
| Gun Crosshair 2 Display | Disabled ✅ / White / Red / Green / Blue |
flycast_lightgun2_crosshair |
disabled / White / Red / Green / Blue |
| Gun Crosshair 3 Display | Disabled ✅ / White / Red / Green / Blue |
flycast_lightgun3_crosshair |
disabled / White / Red / Green / Blue |
| Gun Crosshair 4 Display | Disabled ✅ / White / Red / Green / Blue |
flycast_lightgun4_crosshair |
disabled / White / Red / Green / Blue |
¶ 
External links
- Source code used: https://github.com/libretro/flycast/
- Libretro documentation: https://docs.libretro.com/library/flycast/
- Official website: https://github.com/flyinghead/flycast/