The two parts of a CPS2 setup
The A-board is the system base, housing much of the common processing, I/O, video and sound hardware and connecting to the cabinet. The B-board holds game-specific data and associated circuitry. A 'B-board only' listing generally does not include the full playable system.
Capcom's original operator documentation distinguishes a FULL kit with A/B cartridges from a B-only conversion kit for existing CPS II equipment. This is why an arcade seller's precise wording matters.
What to check in a listing
| Question | Why it matters |
|---|---|
| Is an A-board included? | A B-board alone is not a complete plug-in arcade system |
| What colour and region are indicated? | Case colours were used to indicate region; compatibility needs an exact board check |
| Do the labels, PCB and photos agree? | Cases, boards and ROMs can be swapped or modified |
| What is the security/battery status? | Battery-backed key data may be essential to boot original encrypted code |
| Are the cabinet wires included? | Some games need auxiliary button or audio connections |
Colour codes are clues, not a universal guarantee
CPS2 plastic cases were sold in several regional colour schemes. Blue and green combinations are commonly compatible according to community hardware references, but it is safer to confirm exact board revision, region and modifications instead of relying on plastic colour alone.
An opened or repaired case can be cosmetically misleading. Ask for the actual motherboard designation, game name, label, board photographs and a demonstration of a known working combination where possible.
The security battery story
Original CPS2 games use encrypted program code with security information retained by battery-backed circuitry on the game hardware. Loss of the retained key can prevent an otherwise intact board from starting. This is the origin of the nickname 'suicide battery'.
Preservation options now exist, including documented security reprogramming work by ArcadeHacker. Phoenix or decrypted program sets represent different approaches and must not be confused with untouched original ROM content. A nonworking screen by itself is not a reliable battery diagnosis.
Handle preservation as a separate job
- Document game title, region, cartridge label and PCB revision before any repair.
- Do not casually remove the security battery or disconnect it to 'check' the board.
- Keep metal tools away from powered circuitry; refer battery and CRT work to someone qualified.
- Differentiate original encrypted program images, decrypted replacements, modified sets and stored security keys when recording provenance.
- Do not claim that a replacement part restores a specific B-board without a controlled test on that revision.
What we are studying
Atelier Rocky is considering CPS2 restoration accessories and diagnostic tools. Those ideas are in research, not listed as tested or available parts. A clear distinction between A-board base, B-board game hardware and its security state is essential before any product compatibility chart can be meaningful.
Sources and further reading
Original documentation and specialist references consulted for this article. Always check your model and revision.
Information only: no product compatibility test is being claimed. These workshop accessories are not yet for sale.