RE2-Y8950 - Project RE:birth 2nd Sound Card

What is it?

Project RE-birth 2nd is the spiritual continuation of Project RE-birth — a legendary open hardware project dedicated to bringing classic FM sound chips back to life.

In 2021, for unknown reasons, the Japanese closed the ym2203.com website, deleted all public schematics, and stopped the distribution of all peripheral hardware. Even with money in hand, it became impossible to purchase any SPFM motherboard or rebirth module. This was deeply frustrating for enthusiasts worldwide.

In the absence of original hardware, I forked almost all RE-birth music modules to truly revive this project. My mission: make FM music chips available to people all over the world — no internal meetings, no mystery stores, no hunger marketing, just long-term stock and fair play for everyone.

The RE2-Y8950 is a Y8950 (MSX-AUDIO) sound card designed for the SPFM series. The circuit is fully redesigned by myself and is compatible with the RE:birth bus. It can be used with SPFM Light, SPFM Lite, RESPFM, IAP-RESPFM and other compatible motherboards.

About the Y8950 Chip

The Y8950, also known as MSX-AUDIO, is Yamaha's OPL variant featuring a built-in ADPCM sample playback channel in addition to its 9 FM operators. It was famously used in MSX computers and certain arcade hardware, producing a rich combination of FM synthesis and sampled audio that defined an era of game music.

Key Features

• Compatible with RE:birth bus standard
• Works with SPFM Light, SPFM Lite, RESPFM, IAP-RESPFM and more
• Classic NE5532 dual op-amp for excellent audio output
• Adjustable volume control
• Excellent digital-to-analog isolation for clean sound
• Standardized RE:birth module form factor
• Long-term stock — always available, no artificial scarcity

Supported Chips

• OPL (with ADPCM): Y8950 (MSX-AUDIO)

Compatible Mainboards

• SPFM Light
• SPFM Lite (2 slots)
• RESPFM
• IAP-RESPFM (4 slots)
• STM32-RESPFM (4 slots)

Why Did I Make It?

I referred to original rebirth module schematics and pictures, as well as the SPFM Tower schematic, to faithfully recreate this module. My dream is simple: to make SPFM and RE:birth modules available to everyone in the world — no gatekeeping, no mystery shops, fair play to all.

Thanks to the extensive experience accumulated in designing MegaMod and other RE:birth modules, this module was designed and validated within a week.

What Makes It Special?

The RE2-Y8950 features a clean, minimal appearance with the Y8950 chip logo and key parameters printed on the board. It uses the classic NE5532 universal dual operational amplifier, delivering adjustable volume, excellent sound quality, and solid digital-analog isolation — fully in the spirit of Project RE:birth.

The RE:birth module design philosophy pursues the ultimate in sound quality, standardized appearance, and thoughtful bus layout with proper ground plane isolation. This module honors that philosophy completely, making it both a functional audio tool and a piece of hardware worth studying.