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====== Namco System 22 ======

The **Namco System 22** is an arcade system board developed by Namco. It was released in **1993** and was a pioneer of hardware-accelerated 3D texture-mapped polygon graphics in arcades. Its enhanced revision, the **System Super 22**, followed in 1995 with additional sprite capabilities and graphical effects. Notable games include //Ridge Racer//, //Rave Racer//, //Time Crisis//, //Cyber Cycles//, and //Alpine Racer//.
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==== Quick reference ====

  * **Emulators:** [[#libretro-mame|libretro-mame]] (default), [[#mame|mame]]
  * **Folder:** ''/userdata/roms/namco22''
  * **Accepted ROM formats:** ''.zip'' ''.7z''

===== BIOS =====

No BIOS files are required. All necessary data is self-contained within each game's ROM archive.

===== ROMs =====

Place your ROM files in:

''/userdata/roms/namco22/''

ROMs must match the MAME version used by your Batocera installation. Only parent ROM sets are needed (clones are optional). No CHD files are required for this system.

==== Game list ====

=== System 22 ===

^ MAME ROM name ^ Game title ^ Year ^ Input type ^
| ''acedrive'' | Ace Driver: Racing Evolution | 1994 | steering / pedals |
| ''cybrcomm'' | Cyber Commando | 1994 | joystick |
| ''raverace'' | Rave Racer | 1995 | steering / pedals |
| ''ridgerac'' | Ridge Racer | 1993 | steering / pedals |
| ''ridgeracf'' | Ridge Racer Full Scale | 1993 | steering / pedals |
| ''ridgera2'' | Ridge Racer 2 | 1994 | steering / pedals |
| ''victlap'' | Ace Driver: Victory Lap | 1996 | steering / pedals |

=== System Super 22 ===

^ MAME ROM name ^ Game title ^ Year ^ Input type ^
| ''adillor'' | Armadillo Racing | 1997 | analog stick |
| ''airco22b'' | Air Combat 22 | 1995 | flight stick |
| ''alpinerd'' | Alpine Racer | 1994 | analog stick |
| ''alpines'' | Alpine Surfer | 1996 | analog stick |
| ''alpinr2b'' | Alpine Racer 2 | 1996 | analog stick |
| ''aquajet'' | Aqua Jet | 1996 | analog stick / pedals |
| ''cybrcycc'' | Cyber Cycles | 1995 | steering / pedals |
| ''dirtdash'' | Dirt Dash | 1995 | steering / pedals |
| ''propcycl'' | Prop Cycle | 1996 | analog stick |
| ''timecris'' | Time Crisis | 1996 | lightgun |
| ''tokyowar'' | Tokyo Wars | 1996 | joystick / pedals |

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All games have **imperfect** emulation status in MAME, except ''ridgeracf'' (Ridge Racer Full Scale) which is **preliminary** and may not be playable.
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===== Emulators =====

==== libretro-mame ====

This is the default emulator for Namco System 22 in Batocera. It runs MAME through a RetroArch core.

^ ES setting name \\ ''batocera.conf'' key ^ Description => ES option ''key value'' ^
| **EMULATOR** \\ ''namco22.emulator'' | Choose which emulator to use. => ''libretro'' (default), ''mame'' |
| **CORE** \\ ''namco22.core'' | Choose which core to use. => ''mame'' |

==== mame ====

Standalone MAME can also be used. This may provide better compatibility and more configuration options.

^ ES setting name \\ ''batocera.conf'' key ^ Description => ES option ''key value'' ^
| **EMULATOR** \\ ''namco22.emulator'' | Choose which emulator to use. => ''mame'' |
| **CORE** \\ ''namco22.core'' | Choose which core to use. => ''mame'' |

To use standalone MAME, set the emulator for the system (or per-game) in EmulationStation:

//Game Settings → Per System Advanced Configuration → Namco System 22 → Emulator → MAME//

===== Controls =====

Namco System 22 games use a variety of input devices. Most driving games (Ridge Racer, Rave Racer, Cyber Cycles, Dirt Dash) use **analog steering and pedals** — an analog gamepad or steering wheel controller is strongly recommended.

**Time Crisis** (''timecris'') is a **lightgun game**. You will need a compatible lightgun (such as Sinden, GUN4IR, or Wiimote) configured in Batocera. See the [[lightgun|lightgun setup guide]] for details.

Games like Alpine Racer, Prop Cycle, and Aqua Jet were designed for specialized arcade controls (ski poles, bicycle pedals, jet ski handlebars). These are mapped to analog stick input in MAME.

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If steering feels too sensitive or too sluggish in driving games, adjust the analog sensitivity in the MAME in-game menu (press **Tab** during gameplay → //Analog Controls//).
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===== Hardware specifications =====

=== System 22 (1993) ===

^ Component ^ Specification ^
| Main CPU | Motorola 68020 @ 24.576 MHz |
| DSP | 2× Texas Instruments TMS320C25 @ 49.152 MHz |
| GPU | Evans & Sutherland TR3 |
| Sound CPU | 2× Namco C74 (Mitsubishi M37702) @ 16.384 MHz |
| Sound chip | Namco C352 (32 channels, 42 kHz stereo) |
| Display | 640×480 @ 59.9 Hz |
| Polygon performance | ~240,000 textured quads/sec |
| Graphics features | Texture mapping, Gouraud shading, translucency, fog, Z-buffering |

=== System Super 22 (1995) ===

^ Component ^ Specification ^
| Main CPU | Motorola 68EC020 @ 24.576 MHz |
| DSP | 2× Texas Instruments TMS320C25 @ 49.152 MHz |
| GPU | Enhanced Evans & Sutherland TR3 |
| Sound CPU | Mitsubishi M37710 @ 16.384 MHz |
| Sound chip | Namco C352 (32 channels, 42 kHz stereo) |
| Display | 640×480 @ 59.9 Hz |
| Key enhancements | Hardware sprite layer with zoom/rotation, higher polygon rates |

===== Troubleshooting =====

=== Graphical glitches ===

The MAME Namco System 22 driver (''namcos22.cpp'') has **imperfect** graphics emulation. You may notice:
  * Texture mapping inaccuracies (off by 1 pixel)
  * Garbage tiles in some attract mode sequences
  * Occasional polygon rendering issues
  * Mirror reflections in Ridge Racer 2 and Rave Racer may have visual artifacts

These are limitations of the current MAME driver, not Batocera-specific issues.

=== Performance ===

Emulating the Namco System 22 hardware (dual TMS320C25 DSPs + custom GPU) is CPU-intensive. An **x86_64** system is recommended. ARM-based devices (Raspberry Pi, Odroid) are unlikely to run these games at full speed.

=== Ridge Racer Full Scale not working ===

''ridgeracf'' (Ridge Racer Full Scale) has **preliminary** emulation status in MAME and is not expected to be playable. This is a MAME limitation.

=== Controls not responding correctly ===

  * Open the MAME in-game menu with **Tab**
  * Navigate to //Input (this Machine)// to remap controls
  * Navigate to //Analog Controls// to adjust sensitivity, speed, and dead zones for steering/pedal inputs