Deecy vs Flycast

Deecy is an experimental, open-source Dreamcast emulator written in Zig for Windows and Linux. Its command-line interface loads .gdi, .cdi and .chd disc files, but setup requires users to provide BIOS and flash dumps named dc_boot.bin and dc_flash.bin in the data folder, then choose the directory containing disc images. Deecy should detect and map controllers automatically; users can also assign guest ports manually and customize keyboard bindings. Keyboard shortcuts provide four save-state slots and four matching load-state slots. The emulator supports fullscreen toggling and an unlimited emulation-speed mode. On Linux, the --scif option pipes a serial port to /tmp/deecy/scif for dcload-serial prototyping. DreamPicoPort support is available as an optional build dependency and can be disabled at build time. The project maintains a compatibility list and directs bug reports to its GitHub issue tracker, though issue creation is restricted. The project lists unfinished areas including AICA filtering, framebuffer handling, exclusion modifier volumes and renderer features. The main project is MIT licensed, with MAME data under BSD-3-Clause and CHD features based on MAME code. Unstable builds are available for Windows and Linux.

Flycast Dojo is a free, open-source fork of the Flycast emulator for Sega Dreamcast, Naomi, Naomi 2 and Atomiswave. Its focus is netplay and replay, with training tools for supported games. Players can connect using Match Codes, direct IP connections or virtual LANs such as ZeroTier or Radmin. Match Codes use an internet relay to help start peer-to-peer sessions through firewalls without an account or extra software. Netplay sessions can be recorded and played back, or transmitted to a replay server or listening spectator. Training Mode supports RetroArch .cht cheats, savestates, and recording and playing back inputs. Players can compare ROM MD5 checksums, while successful peer-to-peer play requires matching ROM and BIOS files. The project is bundled with Fightcade and Arkadyzja. It is listed for Android, Linux, macOS and Windows, though the official site links downloads for Windows, Linux and Mac. The documentation notes that Match Codes may have problems on some cloud gaming services or corporate networks.