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  • Transputer microcode documentation?

    From Chris Hanson@21:1/5 to All on Fri Feb 7 16:31:26 2025
    While the microcode itself has been dumped, where has information about
    the microcode structure/interpretation been published?

    It would help enormously in creating emulators.

    -- Chris

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  • From GavinCrate42@21:1/5 to All on Thu May 29 15:13:25 2025
    Hello Chris,

    I have written a number of VBC transputer emulators which run on the
    microcode which I extracted circa. 2015 from the original T414, T425,
    T800 and T805 devices. The latter two with additional FPU (again
    micro-coded).

    Check out my website here:
    https://sites.google.com/site/transputeremulator/

    As for details regarding the microcode internals. I have published on my website the T425 microcode full listing and the complete column driver
    details. Again, please see the following two webpages on my website for details.

    https://sites.google.com/site/transputeremulator/Home/t425-ucode-complete-listing-decoded

    https://sites.google.com/site/transputeremulator/Home/t425-ucode-magic

    Since the transputer microcode details appear to only be of interest to
    a handful of people these days, I only plan to release microcode details
    for the T425 Transputer. It makes for a good study case.


    Regards

    Gavin

    --

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  • From Andy Rabagliati@21:1/5 to All on Fri May 30 12:29:36 2025
    On 5/29/25 17:13, GavinCrate42 wrote:


    https://sites.google.com/site/transputeremulator/Home/t425-ucode- complete-listing-decoded

    https://sites.google.com/site/transputeremulator/Home/t425-ucode-magic

    Since the transputer microcode details appear to only be of interest to
    a handful of people these days, I only plan to release microcode details
    for the T425 Transputer. It makes for a good study case.


    Very impressive - years before Verilog.

    Cheers, Andy!

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