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 is a free emulator for Sega Dreamcast, Naomi, Naomi 2, and Atomiswave. Its Android listing says it runs most Dreamcast games, including Windows CE titles, and arcade games for Naomi, Naomi 2, Atomiswave, and System SP. Graphics options include OpenGL and Vulkan, high-definition and widescreen play, and custom high-definition texture packs. The Android listing specifies 10 save-state slots and names RetroAchievements, modem and LAN adapter emulation, and Power Smash online support in update notes. The project offers regular master builds, experimental nightly development builds, and versioned stable releases. The builds page describes master as relatively stable and cautions that other branches may be unstable, crash, or fail to run. Flycast is available for Android, Linux, macOS, and Windows, with controller support and online multiplayer listed. Game files are not included and must be owned by the user. The repository identifies the license as GPL-2.0.