Deecy
- Android app
- Not listed
- Free plan
- No
- Runs on
- Linux, Windows
Summary
Deecy is an experimental, open-source Dreamcast emulator written in Zig for Windows and Linux. Its command-line interface can load .gdi, .cdi, and .chd disc files. To get started, users provide BIOS and flash dumps named dc_boot.bin and dc_flash.bin in the data folder, then select the folder containing their disc images. Deecy should detect and map controllers automatically; users can also assign guest ports manually and customize keyboard bindings. It provides four save-state slots and four corresponding load-state slots, plus fullscreen toggling and an unlimited emulation-speed mode. On Linux, the optional --scif feature pipes a serial port to /tmp/deecy/scif for dcload-serial prototyping. DreamPicoPort is also available as an optional build dependency. The project maintains a compatibility list and identifies unfinished areas, including AICA filtering, framebuffer handling, exclusion modifier volumes, and renderer features. Deecy is free, with unstable builds for both supported operating systems.
Who it is for
Deecy may suit users looking for a free Dreamcast emulator on Windows or Linux who are comfortable supplying BIOS and flash dumps and using a command-line interface. Its unfinished areas may matter to users looking for a more complete emulator.
What is good
- Loads .gdi, .cdi, and .chd disc files.
- Provides four save and four load slots.
- Supports controller mapping and customizable keyboard bindings.
- Offers fullscreen and unlimited-speed modes.
- Free for Windows and Linux.
What to know first
- Requires Dreamcast BIOS and flash dumps.
- Builds are identified as unstable.
- Several emulator areas remain unfinished.
Verdict
Deecy offers core Dreamcast emulation functions and optional integrations, but the project describes it as experimental and lists unfinished areas. Users should be prepared to supply the required BIOS and flash files.
Compared on Dreamcast emulators
- Free plan
- Yessenryoku.github.io
- Supported platforms
- Windows, Linuxsenryoku.github.io
- Controller support
- Yessenryoku.github.io
- Save states
- Yessenryoku.github.io
- Dreamcast BIOS required
- Yessenryoku.github.io
Facts
- product type
- Deecy is an experimental Dreamcast emulator written in Zig.github.com · 30 Sept 2026
- operating systems
- The official site describes Deecy as an open-source Dreamcast emulator for Windows and Linux.senryoku.github.io · 30 Sept 2026
- installation
- Users download and decompress an archive, place BIOS and flash dumps named dc_boot.bin and dc_flash.bin in the data folder, then choose their disc-image directory.senryoku.github.io · 30 Sept 2026
- disc formats
- The command-line interface can load .gdi, .cdi and .chd disc files.github.com · 30 Sept 2026
- fullscreen and speed
- The emulator supports fullscreen toggling and an unlimited emulation-speed mode.github.com · 30 Sept 2026
- Linux serial integration
- The Linux-only --scif option pipes a serial port to /tmp/deecy/scif for dcload-serial prototyping.github.com · 30 Sept 2026
- DreamPicoPort integration
- DreamPicoPort support is available as an optional build dependency and can be disabled with -Ddreampicoport=false.github.com · 30 Sept 2026
- compatibility
- The project maintains a compatibility list and invites users to contribute through a dedicated repository.senryoku.github.io · 30 Sept 2026
- known limitations
- The README lists unfinished areas including AICA filtering, framebuffer handling, exclusion modifier volumes, and several renderer features.github.com · 30 Sept 2026
- licensing
- The project states that the rest of Deecy is MIT licensed, while MAME data uses BSD-3-Clause and CHD features are based on MAME code.github.com · 30 Sept 2026
- support
- Bug reports are directed to the project's GitHub issue tracker.senryoku.github.io · 30 Sept 2026
- funding
- The official site asks supporters to make a one-time donation through GitHub Sponsors.senryoku.github.io · 30 Sept 2026
- Product
- Deecy is an open source Dreamcast emulator for Windows and Linux.senryoku.github.io · 1 Oct 2026
- Technology
- Deecy is an experimental Dreamcast emulator written in Zig.raw.githubusercontent.com · 1 Oct 2026
- Downloads
- The official site provides unstable builds for Windows and Linux.senryoku.github.io · 1 Oct 2026
- BIOS requirement
- Installation requires copying BIOS and flash dumps named dc_boot.bin and dc_flash.bin into the data folder.senryoku.github.io · 1 Oct 2026
- Disc images
- Users select the folder where their Dreamcast disc images are stored.senryoku.github.io · 1 Oct 2026
- Keyboard
- Keyboard bindings can be customized in Settings.raw.githubusercontent.com · 1 Oct 2026
- DreamPicoPort
- DreamPicoPort support is available and can be disabled with the -Ddreampicoport=false build option.raw.githubusercontent.com · 1 Oct 2026
- Linux serial feature
- The --scif option pipes the serial port to /tmp/deecy/scif on Linux for use with dcload-serial.raw.githubusercontent.com · 1 Oct 2026
- Issue intake
- Issue creation is restricted in the Deecy GitHub repository.github.com · 1 Oct 2026
- Maker
- Sen describes himself as a software developer from France and identifies the project account as Senryoku.github.com · 1 Oct 2026
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Sources
- github.com/Senryoku/Deecy/blob/main/README.md· checked 30 Sept 2026
- senryoku.github.io/Deecy/· checked 30 Sept 2026
- raw.githubusercontent.com/Senryoku/Deecy/master/README.md· checked 1 Oct 2026
- github.com/Senryoku/Deecy/issues· checked 1 Oct 2026
- github.com/sponsors/Senryoku· checked 1 Oct 2026