BD845-PWB IO Board

A clone of the original Konami GN845-PWB(B) Stage I/O board for DDR machines.

Go to firmware repository

Explore the docs

A render of the board from the front.

About the project

The goal of the project is to replicate the original Konami GN845-PWB(B) Stage I/O board by designing a drop in replacement board for future-proofing DDR cabinets.

It emulates the original DDR Stage I/O communication protocol boot sequence allowing to run the game without an I/O Check Bypass. Other protocol features are currently not supported.

It also provides additional features such as debouncing and a Light-On-Press mode that lights up the arrow light when pressed without the need of an external lights driver board.

The board can be re-programmed with a custom/updated firmware. The latest version of the firmware can be found here.

For more information read the docs.

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Project structure

• /fab/ - the files required for fabbrication that includes gerbers, drills and assembly files.
• /kicad/ - the kicad project files.
• /images/ - images and renders.
• /sch_bd845-pwb.pdf - the board's schematic.
• /draw_bd845-pwb.pdf - the board's mechanical drawings.
• /bom_bd845-pwb.csv - the board's bill of materials.
• /ibom_bd845-pwb.html - an interactive bill of materials very useful for manual assembly.

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Images and renders

PCB Front layer:

PCB Back layer:

Original Konami GN845-PWB:

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License

Distributed under the CERN OHL S 2 License. See LICENSE.txt for more information.

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Acknowledgments

• NaokiS - for providing valuable information about the original DDR stage IO communication protocol.
• Marco Ruggiero - for designing the BlueDot logo and beta-testing the board on its own cabinet.
• Mattia Pini - for lending me his KSYS573 computer to carry out tests.
• MameDev - for opensourcing the KSYS573 Boot IO check emulation which this board is based on.
• InteractiveHtmlBom - the Kicad plugin used to generate the interactive BOM.
• Kicad - for allowing me to design this board for free!

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