Voyager 1's FDS Lives Again: A Web Emulator

Voyager 1 FDS Computer Emulator

A new web-based emulator brings the Flight Data Subsystem (FDS) of Voyager 1 back to life, letting you run assembly code on the vintage computer that has been flying since 1977. The emulator includes a full instruction set, registers, memory view, and DMA channels, offering a hands-on way to explore the software that helped humanity reach interstellar space.

  1. rahen

    The author has also published a Setun-70 emulator (a Soviet ternary computer rather than a binary one):

    https://github.com/Zaneham/setun70-emulator

  2. tpoindex

    Are the distance and signal delay numbers supposed to be accurate? NASA's page has them substantially different. Nice work, however!

    https://science.nasa.gov/mission/voyager/where-are-voyager-1...

  3. brandonpelfrey

    I was just looking at this yesterday. Apparently Voyager 1 architecture, ISA, etc are well known but Voyager 2 is still denied via FOIA on grounds of copyright.

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2026-08-08