The Sega NAOMI (stands for “New Arcade Operation Machine Idea”) is a arcade developed by Sega. It was released in 1998. Designed to be the successor to the Model 3, it uses similar architecture to that of the Dreamcast. Because of this, emulation of NAOMI games is usually best done with a Dreamcast emulator (modifications have already been made to allow for this in Flycast, for instance). Features arcade games like Crazy Taxi, Dead or Alive 2 and Samba de Amigo.
Although “NAOMI” can refer to multiple different types of boards released by Sega during this time period, Batocera specifically refers to just the original NAOMI board released in 1998 when mentioning “NAOMI” (at least for now).
Due to the similarity between NAOMI and the Dreamcast, most games were also ported to the Dreamcast, and a few even getting ported to other consoles of the generation. It may be easier to attempt to emulate those than their arcade counterparts.
For those interested in the hardware aspect, here's a cool article about it on Sega Retro.
This system scrapes metadata for the “naomi” and “arcade” groups and loads the naomi
set from the currently selected theme, if available.
Quick reference
Accepted ROM formats:
.lst
,.bin
,.dat
,.zip
,.7z
Folder:
/userdata/roms/naomi
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Emulators |
---|
libretro: Flycast |
Flycast |
BIOS
The BIOS is optional but should be included for best results. For Batocera and above:
MD5 checksum | Share file path | Description |
---|---|---|
eb4099aeb42ef089cfe94f8fe95e51f6 | bios/dc/naomi.zip | NAOMI MAME BIOS |
For Batocera and below:
MD5 checksum | Share file path | Description |
---|---|---|
eb4099aeb42ef089cfe94f8fe95e51f6 | bios/naomi.zip | NAOMI MAME BIOS |
Some games use extra BIOS files. They are required when using libretro: Flycast, and optional when using Flycast but should be included for best results.
MD5 checksum | Share file path | Description |
---|---|---|
bios/dc/hod2bios.zip | The House of the Dead 2 MAME BIOS | |
bios/dc/f355dlx.zip | Ferrari F355 Challenge Deluxe MAME BIOS | |
bios/dc/f355bios.zip | Ferrari F355 Challenge Twin/Deluxe MAME BIOS | |
bios/dc/airlbios.zip | Airline Pilots Deluxe MAME BIOS |
ROMs
Place your Sega NAOMI ROMs in /userdata/roms/naomi
. Flycast uses the MAME ROMset.
User-friendly compatibility list for Flycast.
If you're willing to search through code, here's the list of all the expected ROM hashes.
Some NAOMI boards use just ZIP ROMs to run, but most others use a ZIP in addition to an image (or CHD) file. In order to use ROMs that come with a image, the image must be placed in a subfolder with the same name as the game's ZIP file with the MAME ID as its filename. For example:
roms/└─ naomi/ ├─ ikaruga/ │ └─ gdl-0010.chd └─ ikaruga.zip
Emulators
RetroArch
RetroArch (formerly SSNES), is a ubiquitous frontend that can run multiple “cores”, which are essentially the emulators themselves. The most common cores use the libretro API, so that's why cores run in RetroArch in Batocera are referred to as “libretro: (core name)”. RetroArch aims to unify the feature set of all libretro cores and offer a universal, familiar interface independent of platform.
RetroArch configuration
RetroArch offers a Quick Menu accessed by pressing [HOTKEY]
+ which can be used to alter various things like RetroArch and core options, and controller mapping. Most RetroArch related settings can be altered from Batocera's EmulationStation.
Standardized features available to all libretro cores: naomi.videomode
, naomi.ratio
, naomi.shaderset
, naomi.smooth
, naomi.integerscale
, naomi.bezel
, naomi.bezel_stretch
, naomi.hud
, naomi.bezel.tattoo
, naomi.bezel.tattoo_corner
, naomi.bezel.tattoo_file
, naomi.bezel.resize_tattoo
, naomi.ai_service_enabled
, naomi.ai_target_lang
, naomi.ai_service_url
, naomi.ai_service_pause
, naomi.integerscale
, naomi.runahead
, naomi.secondinstance
, naomi.video_frame_delay_auto
, naomi.vrr_runloop_enable
, naomi.video_threaded
ES setting name batocera.conf_key | Description ⇒ ES option key_value |
---|---|
Settings that apply to all cores of this emulator | |
GRAPHICS BACKEND naomi.gfxbackend | Choose your graphics rendering ⇒ OpenGL opengl , Vulkan vulkan . |
AUDIO LATENCY naomi.audio_latency | Audio latency in milliseconds, turn it up if you hear crackles ⇒ 256 256 , 192 192 , 128 128 , 64 64 , 32 32 , 16 16 , 8 8 . |
ALLOW ROTATION naomi.video_allow_rotate | Allow cores to set rotation. ⇒ On true , Off false . |
CONTROLLER TO LIGHTGUN naomi.lightgun_map | Map controller inputs to lightgun inputs ⇒ On true , Off false . |
libretro: Flycast
A fork of a fork of a fork… this is an identical version of standalone Flycast but inside of a libretro core. Makes use of RetroArch's features.
libretro: Flycast configuration
ES setting name batocera.conf_key | Description ⇒ ES option key_value |
---|---|
Settings that apply to all systems this core supports | |
SYNCHRONOUS RENDERING global.reicast_synchronous_rendering | When threaded rendering is on (on by default), waits for the GPU to finish rendering the frame before dropping the current one. This can avoid certain emulation issues (flashing screens, glitchy video). Significant performance cost. Recommended “Off” for most games as they don't experience issues (or you have a weak machine), “On” if the game has these particular issues. ⇒ Off disabled , On enabled . |
RENDERING RESOLUTION global.reicast_internal_resolution | Enhancement. Increases the rendering resolution. Makes 3D objects clearer. Significant performance cost. Use 640×480 for native. Absurdly high values can degrade image quality (pixels beginning to shimmer). ⇒ 640×480 640×480 , 800×600 800×600 , 960×720 960×720 , 1024×768 1024×768 , 1280×960 1280×960 , 1440×1080 1440×1080 , 1600×1200 1600×1200 , 1920×1440 1920×1440 , 2560×1920 2560×1920 , 3200×2400 3200×2400 , 3840×2880 3840×2880 , 4480×3360 4480×3360 , 5120×3840 5120×3840 , 5760×4320 5760×4320 , 6400×4800 6400×4800 , 7040×5280 7040×5280 , 7680×5760 7680×5760 . |
TEXTURE MIP-MAPPING (BLUR) global.reicast_mipmapping | Enables mip-mapping to smooth out textures on distant 3D objects based on distance and angle. Dreamcast games natively utilized mipmapping to get extra performance out of the hardware, but the extra bluriness from doing this is more apparent on modern, higher fidelity screens. Has a minimal performance cost. enabled should be used in conjunction with anisotropic filtering to mitigate bluriness. Some users may prefer the 'sharpness' of disabled better.⇒ Off disabled , On enabled . |
ANISOTROPIC FILTERING global.reicast_anisotropic_filtering | Enables anisotropic filtering to enhance perspective textures. Dramatically improves the clarity of textures on distant 3D objects when mip-mapping is turned on, especially at higher internal resolutions. Test Drive: Le Mans is the only Dreamcast game that natively utilizes this. Has a small performance cost. Generally safe to use 16x when mip-mapping is also enabled, leave on “Off” otherwise. ⇒ Off False , 2x 2 , 4x 4 , 8x 8 , 16x 16 . |
TEXTURE UPSCALING (XBRZ) global.reicast_texupscale | Enhancement. Applies xBRZ upscaling to textures to improve their clarity. Improvements are subjective. ⇒ Off False , 2x 2x , 4x 4x , 6x 6x . |
FRAMESKIP global.reicast_frame_skipping | Skip frames to improve performance, at the cost of choppy motion. Higher values can cause motion sickness if used for extended periods. Should only be turned up on weak hardware and if immune to motion sickness. ⇒ Off disabled , 1 1 , 2 2 , 3 3 , 4 4 , 5 5 , 6 6 . |
FORCE WINDOWS CE MODE global.reicast_force_wince | Some Dreamcast games (marked “Powered by Microsoft Windows CE” on the box, eg. Sega Rally 2) utilized the MMU Windows Compact Edition API on the Dreamcast to run. Batocera should automatically detect this but in case it doesn't you can manually override it here. Significant performance cost. ⇒ Off disabled , On enabled . |
WIDESCREEN CHEAT (PRIORITY) global.reicast_widescreen_cheats | Enhancement. Flycast has a database of cheats that can enable widescreen support in certain games, rendering them in anamorphic widescreen without changing the internal resolution. Some games also natively support widescreen in their in-game options. A 16/9 ratio must be used and bezels must be disabled. ⇒ Off disabled , On enabled . |
WIDESCREEN HACK global.reicast_widescreen_hack | Enhancement. Changes the internal resolution to a widescreen ratio (eg. 640×480 becomes 853×480). Somewhat glitchy. Some games also natively support widescreen in their in-game options. A 16/9 ratio must be used and bezels must be disabled. ⇒ Off disabled , On enabled . |
CONTROLLER 1 TYPE global.controller1_dc | Chooses the controller plugged into port 1. ⇒ Gamepad 1 , Keyboard 3 , Mouse 2 , Light Gun 4 . |
CONTROLLER 2 TYPE global.controller2_dc | Same as above for port 2. ⇒ Gamepad 1 , Keyboard 3 , Mouse 2 , Light Gun 4 . |
CONTROLLER 3 TYPE global.controller3_dc | Same as above for port 3. ⇒ Gamepad 1 , Keyboard 3 , Mouse 2 , Light Gun 4 . |
CONTROLLER 4 TYPE global.controller4_dc | Same as above for port 4. ⇒ Gamepad 1 , Keyboard 3 , Mouse 2 , Light Gun 4 . |
Settings specific to atomiswave | |
SCREEN ORIENTATION atomiswave.screen_rotation_atomiswave | Rotate screen for some arcade games ⇒ Horizontal horizontal , Vertical vertical . |
Settings specific to naomi | |
SCREEN ORIENTATION naomi.screen_rotation_naomi | Rotate screen for some arcade games ⇒ Horizontal horizontal , Vertical vertical . |
All other settings can be configured from RetroArch's Quick Menu → Options ([HOTKEY]
+ ).
Flycast
Flycast is a fork of Reicast (which itself is a fork of nullDC). A highly compatible and accurate standalone Dreamcast emulator.
Flycast can also be used to run NAOMI arcade games due to being nearly identical hardware. Not all NAOMI games are compatible yet but most of them are.
Flycast configuration
Standardized features available to all cores of this emulator: dreamcast.videomode
, dreamcast.videomode
, dreamcast.bezel
, dreamcast.bezel_stretch
, dreamcast.hud
, dreamcast.bezel.tattoo
, dreamcast.bezel.tattoo_corner
, dreamcast.bezel.tattoo_file
, dreamcast.bezel.resize_tattoo
ES setting name batocera.conf_key | Description ⇒ ES option key_value |
---|---|
Settings that apply to all cores of this emulator | |
SCREEN RATIO naomi.flycast_ratio | Choose which screen ratio you want to use. ⇒ Default False , Widescreen True . |
RENDER RESOLUTION naomi.flycast_render_resolution | Choose which internal rendering resolution you want to use. ⇒ 320×240 (Half) 240 , 640×480 (Native) 480 , 960×720 (x1.5) 720 , 1280×960 (x2) 960 , 1600×1200 (x2.5) 1200 , 1920×1440 (x3) 1440 , 2560×1920 (x4) 1920 , 2880×2160 (x4.5) 2160 . |
GRAPHICS API naomi.flycast_renderer | Choose your graphics renderer. ⇒ OpenGL (Default) 0 , Vulkan 4 . |
ROTATE SCREEN 90 DEGREES naomi.flycast_rotate | Rotate the screen by 90 degrees. ⇒ Normal False , Rotate True . |
All other configuration must be done via the flycast-config
in the Applications folder ([F1]
on the systems screen).
Controls
How does this even work?
Here are the default Sega Naomi's controls shown on a Batocera Retropad:
Troubleshooting
Further troubleshooting
For further troubleshooting, refer to the generic support pages.