Clock Signal vs Jammy

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.

Jammy is a free C# Amiga emulator for Windows and Linux that aims to run Workbench, games, and demos. It lists support for A1000, A500, A500+, A600, A1200, A2000, A3000, A4000, and CD32 models, with OCS, ECS, and AGA emulation. It emulates components including the Copper, Blitter, CIA, sprites, playfields, and audio. Supported floppy image formats for reading include ADF, zipped ADF, ADZ, DMS, and RP9; ATA hard disks support reading and writing. Development tools include a debugger, disassembler, automated code analysis, and SQLite storage for disassemblies. JavaScript and Lua APIs can run code on breakpoints, and a web API supports custom user interfaces. The releases page lists Windows Alpha and Linux Alpha release 0.0.30. The project reports DMA timing problems, incomplete cycle accuracy, poor emulation of CPUs above 7 MHz, and software that does not yet work. CD32 CD-ROM and NVRAM do not work, the IPF floppy reader is broken, and there is no ARM build. Linux lacks debugging interfaces, and its scripting, web, and database APIs need more work.