Copperline

Overview

Copperline is a free, open-source Amiga emulator for playing games and demos as well as developing software. Its mix of browser and desktop netplay, debugging and automation makes it a strong fit for Amiga developers and technically minded players. Its main trade-offs are a few unsupported disk formats and the possibility of needing an original Kickstart ROM.

It models OCS, ECS and AGA machines with 68000 through 68060 CPUs, along with expansion boards, hard disks and CD drives. Supported Amiga models range from the A1000, A500 and A1200 to the A3000, A4000, CDTV and CD32. Disk images can use ADF, ADZ, single-file ZIP, DMS, extended ADF, IPF or SCP formats, but high-density Amiga floppy images and sector-based PC/CrossDOS images are out.

Copperline runs on Linux, macOS and Windows, and in a browser. It includes the AROS open-source Kickstart replacement, though some software needs an original ROM. The project identifies Andrew Hutchings, known as LinuxJedi, as its maker, and says real Amigas serve as a reference for checking emulator behavior. Copperline is licensed under GNU GPL v3 or later; its m68k CPU core uses the MIT license.

Key features

Play together across desktop and browser

Rollback netplay supports two players on desktop or in a browser. Desktop sessions can expand to four players with the four-player adapter, and up to eight spectators can join. That range makes Copperline useful for small shared sessions, although the expanded player count is a desktop-only option. Save states provide a way to preserve progress.

Its libretro core connects Copperline to RetroArch, with support for A500, A1200 and CD32 software, WHDLoad, playlists, save states, four local controller ports and RetroArch netplay. That is a practical route for users already organizing emulation through RetroArch; users focused on other models should note the core's stated software scope.

Debug and automate development

The Debug workspace places registers, disassembly and memory alongside the Amiga display, and supports reverse stepping from snapshots. For developers, that combination makes it possible to inspect machine state while tracing program behavior rather than relying only on what appears on screen.

Scripted inputs and captures, repeatable test sessions, headless runs and a JSON-RPC control protocol support automation. Copperline also documents debugging Amiga source code from Visual Studio Code. These tools give it a clearer development role than a game-only emulator, but they are most useful to people building or testing Amiga software.

Pricing

Copperline is free software, with a free plan and no paid tier described. GNU GPL v3 or later governs Copperline, while the m68k CPU core is MIT-licensed. There is no subscription cost to weigh against its platform and image-format constraints.

Platforms

Copperline supports Linux, macOS, Windows and browser use. Linux users need a Vulkan driver for the AppImage, a requirement that may rule out otherwise suitable systems. The macOS download is ad-hoc signed rather than notarized, so macOS may require approval on first launch.

Who it's for

Copperline is best suited to Amiga developers who want integrated debugging and repeatable automation, and to players who value browser access or rollback netplay. RetroArch users also have a libretro route for supported A500, A1200 and CD32 software. It is a less suitable fit when a collection depends on high-density floppy images, sector-based PC/CrossDOS images or software requiring an original Kickstart ROM the user does not have.

Pros and cons

• Pro: Debugging combines registers, disassembly, memory and the Amiga display, with reverse stepping from snapshots—useful for investigating program behavior.
• Pro: Automation covers scripted inputs and captures, repeatable sessions, headless runs and JSON-RPC control, alongside documented VS Code source debugging.
• Pro: Rollback play works between two desktop or browser players, with desktop support for four players and up to eight spectators.
• Con: High-density Amiga floppy images and sector-based PC/CrossDOS images are unsupported, which limits compatibility for users with those disk collections.
• Con: Some software needs an original Kickstart ROM despite the included AROS replacement.
• Con: Linux AppImage use requires Vulkan, and macOS may block first launch pending approval because the download is not notarized.

Alternatives

For more options, browse Amiga Emulators.

• Amiberry is another free, GPLv3 Amiga emulator, with Android support as well as Linux, macOS and Windows.
• vAmigaWeb is a free alternative for Android, iOS and web platforms.
• Buddi is free budgeting software, rather than an Amiga emulator.
• FS-UAE is another free, open-source Amiga emulator for Linux, macOS and Windows; donations are optional.
• Amigo — Amiga Emulator is free on iOS and macOS, with no ads or accounts; users bring their own Kickstart ROM and disks.
• Damisoft Amiga Emulator is a free alternative for web, Windows, macOS and Linux.
• vAmiga is a free macOS alternative.
• Denise is a free alternative for Linux, macOS and Windows.

Verdict

Choose Copperline if you want an Amiga emulator that pairs broad machine support with serious debugging and automation, or if browser access and rollback netplay matter. Look elsewhere if your workflow relies on unsupported disk images or software that needs a Kickstart ROM you cannot supply.