# Misato MSX sound expansion cartridge for MSX computers

> **Key takeaway:** A new DIY sound expansion cartridge using the Yamaha YMF288 chip brings advanced FM synthesis to the MSX platform.

**Published:** 2026-10-23T15:30:41+00:00 
**Source:** Hackaday Hardware 
**Category:** open-hardware 
**Canonical URL:** https://fosswire.org/news/misato-msx-sound-expansion-cartridge-for-msx-computers.html 

## Summary
Ricardo Suzuki has introduced the Misato MSX, a DIY sound expansion cartridge designed for the MSX computer line. The hardware utilizes a Yamaha YMF288 chip to provide enhanced audio capabilities through FM synthesis. Users can output audio via a stereo line out jack on the cartridge or mix it into the MSX internal mixer.

## Technical specifications of Misato MSX
- Uses the **Yamaha YMF288** (OPN3) chip
- Provides **three SSG channels**, **six FM channels**, and **six rhythm channels**
- Includes a **DAC chip** for synthesized sound output
- Supports **stereo line out** or mono mixing via the MSX internal mixer

## Why it matters
This project provides a way for retro computing enthusiasts to upgrade the audio capabilities of legacy MSX hardware using period-accurate synthesis technology.