Seibu SPI system

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Seibu SPI system
Manufacturer Seibu Kaihatsu
Year 1995
Media Cartridge
CPU Intel 80386-DX 32-bit CISC CPU 25 MHz
GPU Custom Seibu graphics hardware
Sound Yamaha YMF271-F, Zilog Z80 CPU 8 MHz
Resolution 15KHz
Wiring Standard JAMMA

The Seibu SPI system is Seibu Kaihatsu's custom arcade system board. The Seibu SPI system board uses interchangeable game cartridges, however, each cartridge is region specific, and must be paired with a board of the same region. Seibu SPI boards "update" when a game cartridge is changed. This process takes about 10 minutes to complete, and only has to be performed once after a cart change.[1]

Hardware Revisions

There are 3 known revisions of the Seibu SPI system. Revision 1 is the original release board and can be identified by "(C)1995 SXX2C-MAIN V2.0" printed on the main board. Revision 2 has a cleaner layout but no notable changes. It can be identified by "(C)1998 SXX2C-MAIN V2.1" printed on the main board.

Finally a Single-board revision, Seibu SYS386, was produced for the re-release of Raiden Fighters 2 - 2000 & Raiden Fighters Jet 2000. Both have a 40MHz AMD 386 and a considerably weaker sound system (dual MSM6295), resulting in audio issues. A RFJ2000 Single PCB variant exists that uses the proper Yamaha sound system instead.

Changing Cartridges

Switch the system off, swap the cartridge, move the position of jumper JP1, switch on, wait for timer and game boot, and then switch JP1 back.

Game List

Title Japanese Name Release Date Developer Notes
Battle Balls 1995 Seibu Kaihatsu Inc.
E-Jan High School 1996 Seibu Kaihatsu Inc. Japanese Release only
E-Jan Sakurasou 1999 Seibu Kaihatsu Inc.
Raiden Fighters ライデンファイターズ November 1996 Seibu Kaihatsu Inc.
Raiden Fighters 2: Operation Hell Dive ライデンファイターズ2 November 1997 Seibu Kaihatsu Inc. Re-released on a Single PCB as Raiden Fighters 2000
Raiden Fighters Jet ライデンファイターズJET August 1998 Seibu Kaihatsu Inc. Re-released on a Single PCB as Raiden Fighters Jet 2000. Available in both OKI sound system (poor) and Yamaha sound system (original) variants.
Viper Phase 1 バイパーフェイズ1 May 1995 Seibu Kaihatsu Inc.
Viper Phase 1 New Version バイパーフェイズ1 NEW VERSION August 1995 Seibu Kaihatsu Inc. New Version is known as Viper Phase 1: USA in the US.


Dip switches


  • Vol.1 Left channel volume
  • Vol.2 Right channel volume
  • JP1 is used for loading new cartridges (Marked as JP072 on a V2.0 and JP121 on a V2.1 PCB)
  • JP2 selects between mono and stereo (Marked as JP121 on a V2.0 PCB)
  • SW1 reverses the on screen picture
  • CN1 connector for the stereo output[2]