Clock Signal – emulates many home computers

Clock Signal (‘CLK’) is an emulator for a good range of interesting home computers.

It offers emulations of the Acorn Electron, Amstrad CPC, Apple II/II+ and IIe, Atari 2600, ColecoVision, Commodore Vic-20 (and Commodore 1540/1), MSX 1, Oric 1/Atmos, Sega Master System, and Sinclair ZX80/81.

The emulator is released under an open source license.

Features include:

  • Single click loading. CLK aims to automatically select and configure the appropriate machine to run any provided disk, tape or ROM; to issue any commands necessary to run the software contained on the disk, tape or ROM, and to offer accelerated loading.
  • Heavy signal processing tilt for accurate reproduction of original outputs.
  • Aims for the lowest possible latency.
  • 100% accurate emulations.
  • Provisional support for the Sega Master System and its most immediate predecessor, the SG-1000.
  • Built-in screenshot grabbing.
  • Joystick support.

Developer: Thomas Harte
License: MIT License

Prerequisites are SDL 2, ZLib and OpenGL (or Mesa), and SCons for the provided build script. OpenGL 3.2 or higher is required at runtime.


CLK is written in C++. Learn C++ with our recommended free books and free tutorials.

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