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21 thoughts on “Contact

  1. I’m wondering what types of EE sub-fields you use daily to make these projects. Power Systems? Controls? Embedded Systems? If you have any particular references or textbooks you would recommend as well, I’d love to know.

    Thanks in advance.


    • Thanks for the suggestion. It is a great idea to post textbook references! The trouble is, the university I went to (being in Hungary) didn’t use the textbooks normally available in the US. So, I will have to ask you: if you know of good text-books, please let me know, and I’ll compile a list. This applies to links to good on-line resources as well.

      For the sub-fields I use in these projects, that’s a mixture I guess. It’s basic EE, digital, power mostly on the HW side, and control theory, embedded systems, general CS for the SW side.

  2. Hey – I tried connecting via telnet and SSH to your simulator, and nothing 😐 just nothing after connecting (telnet) or typing in the password (SSH).

    • Hi!

      This should be solved for the most part now. For some reason after a while processes don’t get cleaned up properly and get stuck in the ‘zombie’ state. When that start happening, the OS eventually runs out of process handles (or whatever it’s called under UNICOS). At that point you won’t be able to log in as logon would not be able to start the shell for you.

      I still don’t know why this happens (any help would be appreciated!) but what I did was to restart the simulator daily to start from a clean slate. This seems to help, but in some rare cases it still gets stuck in that state.

      So, try now, it should work.

  3. Hello

    Hey wish for you to check out the chaple lang. it is a free language it is a open source programming language for the cray.. just thought i would let you know..


  4. I kept playing with it and found a clue:


    DEVICE: DK20-1 DD29
    OS: COS
    BUFFER MEMORY: 0 14000000
    IOS: Y
    I think this means it has written to a disk that it want loaded.
    Any suggestions?

    • Well, you’ve crashed. Why? That’s hard to tell. This is the ‘kernel panic’ from the IOPs. It means something went horribly wrong, or you’ve pressed CTRL-D.

  5. Various daemons do partial tasks but the logon message fails with error 0251.
    I cannot find a reference to error 0215 in Cray materials I have access to.
    Do you know what this error is?
    In general, the CPU does not respond.
    TTY finds certain channels.
    CONC fails.
    CRAY fails.
    boot_tape.tap is available but cos_117 is the image we need.

    • You probably haven’t booted the mainframe. So the Cray is actually sitting in reset and all you talk to is the I/O subsystem.

  6. It looks like you’ve misspelled the word “Didnt” on your website. I thought you would like to know :). Silly mistakes can ruin your site’s credibility. I’ve used a tool called in the past to keep mistakes off of my website.


    • Phil,

      The emulator does run UNIX, UNICOS to be more precise. That’s the version of UNIX that was developed by Cray for these machines. Can another UNIX (or Linux) variant run on it? I doubt it, not without a lot of effort. These machines have some very quirky architectural choices that make porting OS-es very difficult. On top of that, it’s not just the OS that you would need: for Linux (or any other modern OS really) you would also need GCC to support the platform. That’s no small task on it’s own. Then, you would need to get a C runtime (glibc or something) ported too. Another major project.

      But let’s say you do all that. What would you end up with? Just another Linux machine, except it’s much much slower then even a Pi Zero. So, really, I don’t see the point. This machine is a historical curiosity, and it should be left at that: frozen in time in the late 90’s with it’s own OS running on it.


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