This is the 2nd FM Music Composer Software Cartridge Software for the Yamaha CX5M Music Computer. It is boxed and complete with owners manual. Here's some info about the software...
Yamaha YRM‑501 Music Composer II
The Yamaha YRM‑501 Music Composer II is a powerful and highly regarded evolution of Yamaha’s original Music Composer software for the CX‑series music computers. Released in the mid‑1980s for the MSX platform, this ROM cartridge significantly expanded Yamaha’s early computer‑based music production system, offering enhanced composition tools, improved workflow, and support for more advanced hardware setups.
- Advanced Multi‑Part Composition: Enables automatic composition of up to eight independent musical parts, each with its own voice, allowing sophisticated orchestration and layered arrangements.
- Enhanced Workflow Over YRM‑101: Introduces updated commands, improved editing features, and greater flexibility while retaining compatibility with established Yamaha FM music systems.
- Mouse & Disk Support: Adds support for MSX mouse control for easier note entry and editing, along with disk support for saving and loading compositions, greatly improving usability compared to earlier versions.
- FM Synthesis & MIDI Integration: Designed to work seamlessly with Yamaha’s FM Sound Synthesizer units, including the SFG‑05, and capable of driving external MIDI instruments for expanded performance and sequencing setups.
- Expressive Control: Supports detailed notation for dynamics, tempo changes, chord modes, and performance parameters, making it a powerful early computer‑aided composition system.
- Highly Collectable Software Cartridge: Supplied as a ROM cartridge, the YRM‑501 is now a sought‑after item among collectors, vintage computing enthusiasts, and musicians exploring classic FM‑based composition systems.
Whether you’re building a complete Yamaha CX‑series music system, composing with authentic 1980s FM synthesis, or collecting historically important music software, the
Yamaha YRM‑501 Music Composer II stands as a major milestone in the development of digital music composition.


