The 3.0.0001 version of M-209 is provided as a free download on our website. M209.exe is the default file name to indicate the M-209 installer. M-209 can be installed on Windows XP/Vista/7/10/11 environment, 32-bit version. Our antivirus analysis shows that this download is virus free. M-209 is included in Education Tools. The most popular versions among the program users are 3.0 and 2.1. The actual developer of the free program is DEFCOM.
From the developer:
This simulator, fully compatible with the original cipher machine, enables realistic operation with rotating wheels, setting of wheel pins and drum lugs, combined with authentic graphics. The program comes with a very complete helpfile, containing the manual, the enciphering procedures from the US military and all technical details on the machine. There's also a picture gallery. Complete with formatted clipboard and Autotyping function.
You may want to check out more software, such as Arcus - Rubik's Cube Simulator, Meditation or SOUL, which might be similar to M-209.