Add YM2414 (OPZ) support via ymfm#145
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ValleyBell merged 3 commits intoValleyBell:masterfrom Feb 15, 2026
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- Add DEVID_YM2414 (0x30) device ID - Vendor ymfm source files (commit 17decfa) in emu/cores/ymfm/ - ymfm.h - Core infrastructure - ymfm_opz.h - YM2414 (OPZ) implementation - ymfm_fm.h/ipp - FM engine - Create C++ wrapper (ymfmintf.cpp/h) with extern C interface - Integrate into build system (CMakeLists.txt, Makefile) - Register device in SoundEmu.c - YM2414 specs: 8 FM channels, 4 operators per channel - Used in Yamaha TX81Z, DX11, YS200 synthesizers The implementation follows existing patterns (similar to ICS2115) and is designed to support future ymfm chip additions (OPN, OPM, OPLL, etc.).
- Add ymfm_opz.cpp to build (vendored from ymfm library) - Include ymfm_fm.h and ymfm_fm.ipp for template instantiation - Add opz_test.cpp to generate test WAV file with FM synthesis - Fix key on/off control (bit 6 of register 0x20) - Adjust audio output scaling for proper volume 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Owner
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Seems to look fine so far. I may merge it later. (not right now, as I have a few things that I want to do a few other things before adding new chips) Also, can you please remove the |
Contributor
Author
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Thanks. I just needed OPZ to be available in the emu lib so I can use it with fmtoy. Let me know if you want me to add te other ymfm cores to the existing chips (as alternate cores), in a separate PR. |
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Adds YM2414 (OPZ) emulation support using the ymfm library from https://github.com/aaronsgiles/ymfm.
Changes
DEVID_YM2414(0x30) for YM2414 (OPZ) chipemu/cores/ymfm/ymfm.h- Core infrastructureymfm_opz.h- YM2414 implementationymfm_fm.h/ipp- FM engine baseymfmintf.cpp/hwith C interface following libvgm patternsYM2414 (OPZ) Specifications
Design
The implementation follows existing libvgm patterns (similar to ICS2115 integration) and is designed to support future ymfm chip additions (YM2612/OPN2, YM2151/OPM, OPLL, etc.) with shared infrastructure.
Building
Enable YM2414 support:
cmake -DSNDEMU_YM2414_YMFM=ON # or cmake -DSNDEMU__ALL=ON