Coffee GB v2.0.4 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:
Summary
Coffee GB 2.0.4 improves the on-screen menus and save-state feedback, restores Windows MSI packaging, advances the evidence-backed DMG signal model, and fixes the Super Color 26-in-1 multicart selection protocol. Native packages and the executable JAR were validated for Linux x86-64, Windows x86-64, macOS x86-64, and macOS ARM64.
Merged pull requests
#535 — Show save-state timestamps and feedback (@trekawek)
#536 — Stabilize persistence close tests (@trekawek)
#537 — Restore Windows MSI installer (@trekawek)
#539 — Develop evidence-backed signal core reductions (@trekawek)
#540 — Map DMG schematics to Coffee GB and correct bounded behavior (@trekawek)
#541 — Use ByteBounce for on-screen menu UI (@trekawek)
#542 — Polish on-screen pause and state menus (@trekawek)
#543 — Fix Windows gamepad RawInput polling (@trekawek)
#544 — Fix Super Color 26-in-1 multicart protocol (@trekawek)
#545 — Add scrolling on-screen menu rails (@trekawek)
Fixed issues
#538 — Super Color 26-in-1 menu entries that showed a white screen or launched the wrong game now reach the intended titles.
Platform note
On macOS, game controllers require a compatible system SDL2 installation; keyboard input and emulation remain usable without it.

Download: Coffee GB v2.0.4
Source: Here