The Connection Machine CM-1 "Feynman" T-shirt | Hacker News Reader

The Connection Machine CM-1 "Feynman" T-shirt

tamikothiel.com

115 pointstosh33 comments

Nice, ordered.

For fans of computing history and/or Feynman, this article about his time with, and contributions to, Thinking Machines and the Connection Machine is a great read!

https://longnow.org/ideas/richard-feynman-and-the-connection...

From the article, talking about Feynman: "Fortunately, he was right.

...boy i wouldn't bet against him..

I want one of those t-shirts.

I was incredibly lucky to have been funded to write StarLisp code for the original CM-1 machine. CM-1 was a SIMD architecture, the later models were MIMD. Think of the physical layout being a 2D grid or processors with one edge being for I/O. That was a long time ago so I may have the details wrong.

You can order them at the bottom, lucky you :)

The Connection Machine series (which was featured in Jurassic Park) have the most beautiful LED panels.

Reposting some links from a recent Jurassic Park thread -

https://en.wikipedia.org/wiki/Connection_Machine

https://www.youtube.com/watch?v=T4kBRC2co7Y&t=65s (Jurassic Park)

The LED panel is gorgeous:

https://youtube.com/watch?v=6Ko4qBkEcBM (render)

A lot of people have replicated or restored these:

https://youtube.com/watch?v=qm6w57ZcJZQ

https://www.housedillon.com/posts/resurrected-led-panels/

Worked on the CM-1 and CM2. I felt they were awful buggy. At one point they asked if they could use my code to run as a diagnostic, it would break the log() function on occasion.

The Cray fluorinert fountains were way cooler :)

This is so cool to read, thank you for sharing!

Around the same time (1984), there was also another very cool piece of technology that often gets overlooked: the CMU WARP. It wasn’t as flashy as the Crays and the Connection Machine, but it was the first systolic array accelerator (what we’d now call TPUs). It packed as much MFLOPS as a Cray 1.

It's also the computer that powered the Chevrolet Navlab self-driving car in 1986.

I'd be interested to hear what you thought of the programming architecture.

Excluding the bug side of things. If they did everything they were supposed to how hard was it to get them to perform a task that distributed the work through the machine.

I read some stuff on, I forget, maybe *lisp? I found it rather impenetrable.

On top of this, have there been any advances pin software development in the subsequent years that would have been a good fit for the architecture.

I always thought it was an under explored idea, having to compete with architectures that were supported by a sotware environment that had much longer to develop.

I used them at the (US) Naval Research Laboratory, programming in a dialect of C called C*. This automatically distributed arrays among the many processors, similar to how modern Fortran can work with coarrays.

If the problem was very data-parallel, one could get nearly perfect linear speedups.

I ordered one of these a while back. Be warned that it will shrink if put in the dryer.

Thanks to HN, you _may have_ a solution to unshrink it

<https://news.ycombinator.com/item?id=46572307>

> As an ironic footnote, a friend who worked for Steve Jobs at NeXT told me the CM-1 was the inspiration for the form of his NeXT machine. <https://tamikothiel.com/cm/tshirt/index.html>

You can see it in action here <https://www.paulrand.design/work/NeXT-Computers.html>

Bought one but it was too big... into the drawer of commemorative t's it goes

https://news.ycombinator.com/item?id=46865400

Oversized t-shirts are great for lazing around the house though, I had some 3XL basic ones during the panny-D along with pajama pants, it was great :D

My shirts are stolen by my children so they can wear "daddy shirts" which are way too big; they got me a gigantic 5XL shirt labelled "Daddy's Daddy Shirt" for my birthday to give me the same experience.

I still have my original one!

I thought of N-Cube machines when I saw it, CM didn't even occur to me.

I still have one of the long-sleeved original ones.

What were the LED's indicating?

Depended on what was running.

As a developer you had explicit access to them, so you could use them for debugging. A lot of times, they were just running an RNG to look cool though.

There is no documentation of what the LEDs were _actually_ doing. There are descriptions, like 'Random and Pleasing is an LFSR', but no actual information that maps to actual pixel coordinates spaced in time. Nearly zero code.

I'm saying this because I need this information, and the fastest way to get information is to state that it's impossible or doesn't exist.

Seems like CM-1 and CM-2 show CPU activity, so each light blinked when a CPU did something. Those were the ones that were designed by Tamiko Thiel.

Then, CM-5 did have the option of having "artistic" or "random patterns" on it, apparently designed or co-designed by Maya Lin. IIRC, the CM-5 is the one appearing in Jurassic Park.

I don't know if is there any firmware code or hardware design available to check how that function worked. Maybe the people from the Computer History Museum knows something. They have the first CM-1 and have at least one CM-5.

Check their library to see if maybe some of the technical docs say something:

https://www.computerhistory.org/collections/catalog/search-c...

I would also like to obtain this information that clearly doesn't exist. Please reply to my comment to prove me wrong.

Blinkenlights

Amusing this downgraded when it points directly to the word used for the phenomenon: https://en.wikipedia.org/wiki/Blinkenlights

I seem to recall an intel i960 was used to drive leds on at least one model.

Replying to myself here - I decided to just actually go read wikipedia about this. Here's the answer:

<quote>

By default, when a processor is executing an instruction, its LED is on. In a SIMD program, the goal is to have as many processors as possible working the program at the same time – indicated by having all LEDs being steady on. Those unfamiliar with the use of the LEDs wanted to see the LEDs blink – or even spell out messages to visitors. The result is that finished programs often have superfluous operations to blink the LEDs.

</quote>

That's a lovely unintended side effect of incentives :P

I love that, makes me want to build an analog PC and stuff. Or visualizers for system activity.

Yes I'd unironically watch defrag work.

Thanks for this post.

only europe and the us. but im in japan :(

The EU shop seems to ship to JP. It's almost 20€, so you might want to add something else to the basket.

I guess that you'll need to do customs paperwork (or maybe not, can't remember how Japan does with custom duties on items of small price)

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