Clock Signal vs Copperline

Clock Signal is a free emulator for running classic software on Linux and macOS without first having to learn the original machine or emulator controls. It supports systems including the BBC Micro, Apple II, Atari 2600, Commodore Vic-20, early Macintosh, MSX, Sega Master System and ZX Spectrum. When you provide disk, tape or ROM media, it can identify and configure a machine, issue the commands needed to start the software, and speed up loading where possible. It does not import or take ownership of your files. The emulator processes video signals such as composite video and generates audio at the emulated machine’s source rate before filtering it for host output. Its README gives typical audio latency as 5–10 ms; display latency depends on host hardware. It aims for cycle-accurate emulation, which it says it achieves in some cases. Acorn Archimedes, Commodore Amiga and early PC compatible emulation is less complete than for the other listed systems. A BIOS is required. The project is MIT licensed, with macOS releases using Cocoa and Metal and Linux builds available through Qt, OpenGL or SDL options.

Copperline is a free, open-source Amiga emulator for games, demos, and development, available on Linux, macOS, Windows, and in browsers. It models OCS, ECS, and AGA machines with 68000 through 68060 CPUs, plus expansion boards, hard disks, and CD drives. Its Debug workspace puts registers, disassembly, and memory beside the Amiga display, and supports reverse stepping from snapshots. Development features include scripted inputs and captures, repeatable test sessions, headless runs, a JSON-RPC control protocol, and debugging Amiga source code from Visual Studio Code. Rollback netplay supports two players on desktop or in browsers, up to four desktop players with the four-player adapter, and up to eight spectators. A libretro core supports RetroArch, including A500, A1200, and CD32 software, WHDLoad, playlists, save states, four local controller ports, and RetroArch netplay. Copperline includes the AROS Kickstart replacement, though some software needs an original Kickstart ROM. It does not support high-density Amiga floppy images or sector-based PC/CrossDOS images.