Debugging the AMD GPU

Although Robert F. Kennedy gets the credit for popularizing it, George Bernard Shaw said: “Some men see things as they are and say, ‘Why?’ I dream of things that never were and say, ‘Why not?'” Well, [Hadz] didn’t wonder why there weren’t many GPU debuggers. Instead, [Hadz] decided to create one.

It wasn’t the first; he found some blog posts by [Marcell Kiss] that helped, and that led to a series of experiments you’ll enjoy reading about. Plus, don’t miss the video below that shows off a live demo.

It seems that if you don’t have an AMD GPU, this may not be directly useful. But it is still a fascinating peek under the covers of a modern graphics card. Ever wonder how to interact with a video card without using something like Vulkan? This post will tell you how.

Writing a debugger is usually a tricky business anyway. Working with the strange GPU architecture makes it even stranger. Traps let you gain control, but implementing features like breakpoints and single-stepping isn’t simple.

We’ve used things like CUDA and OpenCL, but we haven’t been this far down in the weeds. At least, not yet. CUDA, of course, is specific to NVIDIA cards, isn’t it?

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hackaday.com/2025/12/16/debugg…

Keebin’ with Kristina: the One with the Curious Keyboards

I love first builds! They say so much about a person, because you see what’s paramount to them in a keyboard. You can almost feel their frustration at other keyboards come through their design choices. And the Lobo by [no-restarts] is no exception to any of this.

There’s just something about this Corne-like object with its custom case and highly-tappable and variously tilted keycaps. The list of reasons for being begins innocently enough with [no-restarts] wanting a picture of their dog on the case.

Image by [no-restarts] via redditFrom there, things get really personal. You may notice the thumb cluster is slightly different — [no-restarts] doesn’t like the thumb tuck required by the Corne to reach the innermost keys. I really dig the homing bumps on the middle thumb keys. Another difference is the splayed layout, as [no-restarts] is especially prone to pinky splay. Finally, there are a pair of OLEDs hiding on the inner sides of the case, which are designed to be visible when tented.

Overall, [no-restarts] is happy with it, but has some ideas for revision. Yep, that sounds about right. The Lobo is all hand-wired, and there’s a PCB with hot swap sockets in its future. If you’re interested in the case files, GitHub is your friend.

Getting a Handle on Grabshell

[kurisutofujp] recently saw a GrabShell in the flesh, and why haven’t I heard of this keyboard before? The next best time is now, so here we go with the explanation, both for myself and the other 9,999.

Image by [kurisutofujp] via redditEssentially, this thing is made for using while you wander around the office (or the Metaverse). You can hold it in mid-air, secured in your Gargoyle-ness with a pair of straps, your fingers wrapped around to hit the alphas.

But you don’t have to use it that way, see. You can stand it up on the desk if you don’t want to type in mid-air. It can also be opened sort of halfway and used like a SafeType vertical keyboard.

If none of this excites you, GrabShell can also be laid flat on the desk. The distance between the two halves in this configuration is quite generous, and frankly, I’m a bit jealous.

So let’s talk about the generous thumbing-around area. As you’ll see in the video below, the left has a joystick and a toggle switch that flips it from arrow keys to mouse cursor. There’s a serious-looking scroll wheel beneath that. All three of these can be pushed in for additional inputs.

The right side of the thumb panel has a sweet-looking trackball that’s housed in a really cool-looking way. Another cool thing: there’s a frigging I2C port on the top, just exposed and hanging out because reasons.

Switch-wise, the board is a mix of hot-swappable Gateron G Pro browns and low-profile Gaterons under double-shot ABS keycaps. I think it sounds nice in the video below; others say it sounds cheap and hollow. To each their own.

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The Centerfold: ZMK Dongle Repackaged As Vintage Computer

Image by me using images by [mharzhyall] via redditIt’s just so cute, that’s why it’s here. The buttons, they do nothing, but that’s okay — they might could do something in the future.

This is a ZMK dongle, like I said in the subheading, and [mharzhyall] put a new case around it. Basically it lets you connect keyboards wirelessly.

Do you rock a sweet set of peripherals on a screamin’ desk pad? Send me a picture along with your handle and all the gory details, and you could be featured here!

Historical Clackers: the Edland Typewriter Was a Total Flop

The Antikey Chop reports that this curious little rook-looking index typewriter was such as flop as to be nearly lost to history entirely.
Image via The Antikey Chop
Produced between 1891 and 1893 by the Liberty Mfg. Company, the machine was conceived by Joseph Laurentius Edland of Brooklyn, NY. All seemed lost until 1964, when a handful of Edlands were found languishing in a warehouse in Galway, NY.

Although only made for two years, there were three different versions developed. The one pictured here is the second, with a metal base and embossed index, whereas the first had a wood base and flat index.

The third version, the Typewheel Edland, had a typewheel for a print element à la the Blick. Edlands cost a semi-reasonable $5 at the outset, but eventually doubled in price.

So, why the absolute failure? It was no better or worse a machine than its contemporaries, but perhaps just wasn’t well-marketed. Another theory is that the Edland failed because they were made of pot metal. Seems reasonable. Want to know how to use one? RTFM (PDF).

Finally, a Keyboard with a Mechanical Watch Movement

Wait, what? Why though? Well, it ticks along as you type, is that cool? It might be fun to see if you can keep up a certain number of keystrokes per second. Okay, I’m warming up to this idea pretty quickly, can you tell?

The Nama keyboard, dubbed after the scientific term for the mammoth, is appropriately named. It can weigh up to an astonishing 19.4 lbs (8.8 kg) depending on the case material. (Consider that a Model M, a proper bludgeoning device in its own right, weighs just 5 lbs (2.2 kg).)
This Nama has a tourbillion movement, the granddaddy of them all. Image by Wuque Studio via Notebook Check
Nama comes from Wuque Studio, and was built as an ode to their manufacturing capabilities. Now this is starting to make more sense. They are the Banana Republic to vendor Chilkey’s Old Navy, who are the brand behind the ND75, if that rings any bells.

Now the Nama looks like your basic mechanical keyboard on the surface, but five years of design decisions went into this line. You can get it with an aluminium case (14.5 lbs / 6.6 kg) or a brass CNC’d case (18.95 lbs / 8.6 kg), which of course is what makes it so heavy.

But yeah, the defining feature is definitely the watch movement. You bet your Backspace it’s fully functional except as a watch, and it doubles as a volume control knob, so you don’t have to settle for touching it with just your eyeballs.

Yeah, so the astute among you will have noticed that there are no numbers or hands on the watch movement, which would be, what, tacky? I don’t know anymore. At any rate, it’s protected by a piece of sapphire glass, which should keep Cheetos dust and such out of there.

Oh, you want to know the cost? $749 for the bare-bones with no movement, and $1299 for the brass-bottomed boy with the tourbillion. That’s… actually not that bad for a tourbillion movement.

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Got a hot tip that has like, anything to do with keyboards? Help me out by sending in a link or two. Don’t want all the Hackaday scribes to see it? Feel free to email me directly.

hackaday.com/2025/12/16/keebin…

Virtual Pet Responds To WiFi

When the Tamagotchi first launched all those decades ago, it took the world by storm. It was just a bunch of simple animations on a monochrome LCD, but it had heart, and people responded to that. Modern technology is capable of so much more, so [CiferTech] set out to build a virtual pet that can sniff out WiFi networks.

The build employs an ESP32-S3, perhaps the world’s favorite microcontroller that has WiFi baked right in from the factory. It’s paired with a 240×240 TFT LCD that delivers bright, vivid colors to show the digital pet living inside. Addressable WS2812B LEDs and a simple sound engine provide further feedback on the pet’s status.

The pet has various behaviors coded in, like hunting, exploring, and resting, and moods such as “happy,” “curious,” and “bored.” For a bit of environmental reactivity, [CiferTech] also made the local WiFi environment play a role. Nearby networks can influence the “hunger, happiness, and health” of the pet.

Incidentally, if you’ve ever wondered what made the Tamagotchi tick, we’ve explored that before, too.

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hackaday.com/2025/12/16/virtua…

Thorium-Metal Alloys and Radioactive Jet Engines

Although metal alloys is not among the most exciting topics for most people, the moment you add the word ‘radioactive’, it does tend to get their attention. So too with the once fairly common Mag-Thor alloys that combine magnesium with thorium, along with other elements, including zinc and aluminium. Its primary use is in aerospace engineering, as these alloys provide useful properties such as heat resistance, high strength and creep resistance that are very welcome in e.g. jet engines.

Most commonly found in the thorium-232 isotope form, there are no stable forms of this element. That said, Th-232 has a half-life of about 14 billion years, making it only very weakly radioactive. Like uranium-238 and uranium-235 it has the unique property of not having stable isotopes and yet still being abundantly around since the formation of the Earth. Thorium is about three times as abundant as uranium and thus rather hard to avoid contact with.

This raises the question of whether thorium alloys are such a big deal, and whether they justify removing something like historical artefacts from museums due to radiation risks, as has happened on a few occasions.

Elemental Facts

Thorium-232 decay chain. (Source: Wikimedia)
Since the (probably machine-generated) article that inspired these questions didn’t bother to include any useful details or references, it’s time to do a bit of a dive ourselves. This starts with the element thorium and its isotopes.

Obviously the problem with thorium here is not so much with the metal itself or its elementary properties, but rather the fact that a small fraction will decay into radium-228 via alpha decay. This has a half-life measured in years before rapidly passing through actinium-228 to become thorium-228, with a half-life of 1.9 years.

The subsequent decay chain is pretty rapid, taking it through very short-lived isotopes of radon-220, polonium-216 and so on until it becomes stable lead-208. Virtually all of this occurs via alpha decay. Of note is again that the initial isotope here – Th-232 – has a half-life of 14 billion years, or roughly the estimated age of the Universe. This makes it by far the most stable unstable isotope, with U-238 having a half-life of only about 4.463 billion years. Effectively, for most intents and purposes it might as well be a stable isotope.

Thorium is found in most rocks and soil, at around 6 ppm, with several minerals like thorite and monazite containing significantly higher levels.

This raises the question of how dangerous Th-232 truly is, such as when you start concentrating it in some fashion. How much radiation exposure do you experience once you take e.g. thorium ore and wear it around, or concentrate it into pure Th-232 and combine it with magnesium into a metal alloy that people regularly spend time around?

Negative Vibes

One persistent fad in the ‘alternative health’ community is that of negative ions and kin, with many shops selling items like bracelets and similar body-worn items that are supposed to generate these chi-balancing vibes via special ions. Interestingly, some of these are sold with thorium or uranium isotopes embedded in them.

Since these items are worn directly against the skin for extended periods of time, they form an excellent test case of the potential harm of such direct exposure to a significant amount of these isotopes.

According to the fact sheet on on the NRC website, as performed by Oak Ridge National Laboratory (ORNL), these items contain sometimes quite significant quantities of the radioactive material that range from Th-232 to U-238 and even Ra-226, some at more than 0.05% by weight to the point where they would have required a radioactive material license. The estimated local skin equivalent radiation dose was said to be more than the IAEA limit of 50 mSv annually. Despite this, these items require no special disposal methods and you are free to keep using them, albeit with some precautions.

Another study showed an annual exposure of 1.22 mSv, which with the assumed validity of the linear no-threshold (LNT) model would lead one to expect to see some kind of negative health effects. So far these have remained absent despite the popularity of these bracelets and the close contact.

TIG Welding

Thoriated tungsten TIG welding electrodes, with red band. (Credit: Weldguru.com)
Outside of accidental exposure in the case of weird bracelets, there is a common use case for thorium, with thoriated tungsten welding electrodes. These are used with DC TIG welding, and contain around 1% (yellow band) to around 2% (red band) of thorium oxide (ThO₂). Although an alternative exists with cerium oxide (CeO₂) in ceriated tungsten electrodes, thoriated tungsten remains popular due to the long lifespan and good performance with common applications.

Although it’s noted that thoriated tungsten electrodes are radioactive due to the small percentage of thorium within the ThO₂, it is such a small amount that no special precautions seem to be warranted. Much like with the thorium oxide found in the aforementioned bracelets and kin, you’ll probably be fine if you don’t try eating it.

Since thorium is also not a heavy metal, unlike uranium, it is in that regard significantly safer, as is its oxide form which does not have the pyrophoric proclivity of the metal form.

Alloys

Compressor of a J-79 jet engine with Mag-Thor alloy sections (Credit: T.P. Kuipers et al., Ministerie van Defensie, Bundeswehr
This brings us back to the thorium-metal alloys which started the whole journey. A number of missiles and jet engines have used or currently use Mag-Thor alloys, which has led to for example the Dutch and German defense ministries investigating the radiation exposure from the J-79 jet engines, as found in F-104G Starfighter and F-4 Phantom aircraft.

The reason for this investigation was, as stated, the expected radiation dose when these engines and their respective aircraft are being worked on, handled for disposal, or displayed in a museum or collection. Here we also see the amount of thorium added to the used alloy, at up to 4% by weight, with an average of 1.7%. This means that the overwhelming majority of metal in these alloys is magnesium.

Part of the study was the measured dose at various distances from the components examined, along with a potential cumulative dose. Even in the most conservative scenario the dose came to about 1.2 µSv/hour, or less than 1 mSv/year, since it was probably assumed that people generally do not live 24/7 around these objects.

Realistically, a much bigger potential health risk involving thorium would be something along the lines of incandescent gas lantern mantles, which leads to significant higher exposure to the general public. Not to mention the hazards of the radioactive potassium-40 in something like bananas.

hackaday.com/2025/12/16/thoriu…