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A titanium deployment and downlock truss from the landing gear of the lunar module beckons in the corner…

But the autopilot brain-in-a-box is much more interesting.

It’s a core memory module from a Saturn LVDC (Launch Vehicle Digital Computer). They are quite rare as scrap dealers recover $20-30K of gold and platinum from these cores. (more photos from the spaceaholic source of this). The outer wrap consists of timing, drive, inhibit and sensing circuits.

More interesting still is the ghost in the machine. The magnetic cores within still hold whatever program they had when powered down. Since there are no tapes or archives of the code, it is possible that the only remaining copy of the Saturn V flight program is in cores like this. I have the load/write boards, and they look very wonky. If you know of any living domain expert on this system, please point them my way.

This module stores 106k bits (4096 words of 26 bits, 28 with 2 parity bits, across 14 planes with a 128 x 64 fabric of ferrite donuts)… encoding 26-bit instructions, with the first triple-redundant logic. Ultrasonic delay line cache. Destructive readouts. Failure is not an option.

12 responses to “Apollo Lunar Modules”

  1. Sweet a one time-exploration toy !!!

    What ‘s inside of the Falcon 9 box ? =)

  2. Hmm. If the planes are physically accessible, you may be able to non-destructively read them by inspecting their surface magnetic field with a small Hall-effect or similar magnetic (GMR?) field probe.

    Edit: like this: web.nanomagnetics-inst.com/Articles/JVST_first_SHPM.pdf

  3. Yeah, I think that would be the way to go at first. or external probing of the wirelines decoupled from the existing circuitry

    Photonquantique: Toys! The box is the shipping container for a scale Falcon9 model.

    Here’s another angle on the landing gear truss
    LEM Strut

  4. Steve, I emailed my uncle to ask if he has any knowledge of the LVDC. He was in the space program since its inception and may know or know of someone that could help you. (I copied you on my email to him)

    I’ll let you know what I hear from him. This is quite exciting!

  5. The vanilla frosting is interesting.

  6. Yes, epoxy potting to reinforce for g-forces.

    thanks Rocketeer!

  7. sweet! ah old tech; how I love thee.

    to remember how my blackberry 950 was the same chip as the guidance for the shuttle; or how the 8086 behind me waits for me to bring it to life

  8. One wonders how small that computer would be with today’s technology in order to perform the same function.

  9. I’m sure you already know about this, but there’s some LVDC documentation here. No source code unfortunately, although they do have source for some of the other Apollo systems.
    http://www.ibiblio.org/apollo/links.html

  10. great stuff. Thanks.

    [http://www.flickr.com/photos/wfdt] – all digital compute power on the Saturn V should fit in an iPod nano today. But they did have some clever analog and mechanical feedback mechanisms scattered throughout.

  11. and now, a detailed writeup on this memory blockMemories of the Saturn V

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