2026-08-23

Coffee GB v2.0.5

EmuCR: Coffee GB Coffee GB v2.0.5 is released. Coffee GB is a Gameboy Color emulator written in Java 16 (core) and Kotlin (UI). It's meant to be a development exercise.

Features:
Full support for GB & GBC emulation.
Partial Super Gameboy emulation (borders and palette).
Cycle-exact CPU emulation. Each opcode is split into a few micro-operations (load value from memory, store it to register, etc.) and each micro-operation is run in a separate CPU cycle.
Quite compatible (all the Blargg's tests are passed, although some game still doesn't work)
Rollback-based netplay
MBC1-5 support
Battery saves
Support for zipped ROMs
ROM-based compatibility tests run from Maven

Coffee GB Changelog:
Coffee GB 2.0.5 improves compatibility with unlicensed cartridges and four-player/link games, adds substantial Android PERFORMANCE-mode throughput, and completes the desktop library/settings refresh. It also carries the Super Fighters S protection/vector compatibility work and preserves the new serial/link phases in portable state. Contributors in this release include @trekawek.
The release range also includes direct commits for Jantaku portable serial state (c8c8b3b1), Jantaku transition handling (904bae12), Super Fighters S support (848b83c6), and linked-playback capture/state fixes (6c066296).
Merged pull requests
#546 Simplify in-screen settings and loading status.
#547 Expand in-screen settings and add Recent Games.
#548 Align the desktop Library screen with Recent Games.
#560 Detect Vast Fame SL multicarts.
#567 Install the Gitshot compatibility-evidence skill.
#563 Fix Unlicensed 256M multicart game loading.
#571 Optimize Android PERFORMANCE hot paths.
#564 Add GGB81 mapper support for Shuma Baolong.
#565 Detect the Makon NT-new mapper for Digimon 4.
#562 Fix Super Mario Special 3 mapper detection.
#572 Unlock Android PERFORMANCE packet spans.
#566 Avoid wrapped frames after linked rollback.
#561 Fix Sonic Adventure 8 mapper detection.
#577 Speed up PERFORMANCE mode for idle links and settled HALT.
#578 Batch settled DMG HALT spans in PERFORMANCE mode.
#574 Fix Super Fighters S VF001 protection.
#575 Fix Uno four-player connection setup.
#576 Fix Jantaku Boy four-player transition.
Fixed issues
#551 Vast Fame SL multicart detection.
#552 Unlicensed 256M multicart game loading and persistence.
#553 GGB81/Shuma Baolong rendering and state support.
#554 Makon NT-new/Digimon 4 detection and RAM persistence.
#555 Sonic Adventure 8 mapper detection.
#556 Super Fighters S VF001 protection and live-patch support.
#557 Super Mario Special 3 mapper detection.
#558 Wrapped frames after linked rollback.
#559 Jantaku Boy four-player transition.
#568 Uno four-player connection setup.
Visual evidence
After — Uno linked rollback/pacing fix keeps both linked displays clean:
Distribution notes
Native packages in this release are unsigned. On macOS, game controllers require a compatible system SDL2 installation; keyboard input and emulation remain usable without it.

Download: Coffee GB v2.0.5
Source: Here

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