Giving The NES An Optical Data Storage Add-On

August 30, 2026 by Maya Posch 10 Comments

The introduction of optical media in the form of CDs meant a revolution in the world of gaming consoles, escaping the restrictions of a few dozen MB of storage and instead offering a theoretically infinite amount of storage through the miracle and tedium of swapping discs. After the SNES narrowly escaped getting a CD add-on and the N64 doubled down on cartridges, we can now at least get an impression of what it’d be like if the Nintendo Entertainment System had been gifted a CD add-on back in the 1980s, courtesy of a project by [Throaty Mumbo].

The NES future we could have had. (Credit: Throaty Mumbo, YouTube) — The NES future we could have had.

There’s also an accompanying video containing typical hijinks and a demonstration of this system. Initially [Throaty Mumbo] was going to make a SNES CD add-on to match that console’s initial prototype, but doing it for the NES seemed more fun. Obviously, since the NES is quite limited hardware-wise it was always going to be a struggle, even if the original front-loading NES conveniently has a mostly unused expansion slot.

On the custom PCB there is an RP2350B microcontroller that mediates between an Everdrive N8 Pro cartridge and an IDE CD drive, along with a PCM5102 audio DAC. The expansion port is hereby used to receive the audio samples on its audio mix input pin, along with power. After boot the game ROM is read off the CD by the MCU and streamed over USB to the Everdrive.

Combined with the previous work [Throaty Mumbo] did to revive the long-defunct Japanese online service for the NES, it’s an exciting time for fans of the iconic console.

Continue reading “Giving The NES An Optical Data Storage Add-On” →

Reviving An SD Card With Shorted Capacitors

August 28, 2026 by Maya Posch 19 Comments

A nice thing about SD cards is that even in their non-micro format they are conveniently small. This is however a bit of a problem when an SD card stops working, as they are not exactly designed to be easy to service, or to recover data from. There is however a very good chance that the Flash memory and controller are still fine, and it’s actually one of the passives on the tiny PCB that failed, as with the 32 GB SD card that [Yevgeniy Kapishon] recently diagnosed and recovered data from for a customer.

Tiny capacitors in an SD card package. (Credit: Aeson Labs)

A big hint during initial diagnostics was a clear short between the supply rail and ground, but as became clear when taking the SD card apart, this one was built as a monolithic package, without exposed components on a PCB as in older SD cards. Correspondingly an X-ray machine and thermal camera were used to figure out what was inside the package, and where the short was located.

By combining the hot spot image with the X-ray it was determined that the problem was with some passives near the edge of the package. Some careful material removal later two miniscule capacitors were found to be the culprit and gently removed. With this the short on the power rail vanished, and the SD card started working again.

Having a shorted MLCC or similar passive component is a very common failure mode in general which can cripple even the most expensive device. Even if SD cards still aren’t really repairable, it’s at least reassuring to know that in many cases the data is fairly easy to recover once you have identified and removed the offending part.

Casting Engine Parts From 3D Prints

August 28, 2026 by Maya Posch 28 Comments

After building a couple of internal combustion engines by milling billet aluminium stock and cringing at the absolute waste of material this created, [Camden Bowen] figured he’d give casting metal parts a shot. Of course, the key here is to create the molds for said casting, which is where you got a few options available.

Since DIY is really his thing, he also made his own kiln using cement and perlite, plus a propane burner. For the aluminium material to melt, he bought a stack of aluminium alloy wheels, as these are made of an alloy that’s actually suitable for casting. These were turned into ingots as a first step towards casting the engine parts, which among other things helps to purify the metal.

For the actual casting method he picked lost PLA, meaning the intended shape is 3D printed in PLA, then put into plaster before it’s melted out of the newly minted mold in an oven and subsequently burned out in the kiln. For the plaster [Camden] used regular Plaster of Paris, mixed with sand to give it suitable heat-resistant properties.

After some trial and error, as well as a lot of trouble burning out all the PLA, he got a usable mold and managed to eventually cast an engine cylinder with only a few imperfections. Considering just how convoluted it would have been to mill that part out of billet aluminium, it’s easy to see why commercial manufacturers are casting such parts as well.

Continue reading “Casting Engine Parts From 3D Prints” →

Running Multiple Linux Kernels Without Hypervisor

August 27, 2026 by Maya Posch 15 Comments

In a move that’s no doubt going to trigger a lot of confusion and nostalgia, Mklinux is back, in a sense. As the announcement makes clear, this is multikernel Linux, not microkernel Linux, which is an experimental OS designed to run the Linux kernel as a user-space server running on top of OS X’s Mach kernel.

Naming overlap niggles aside, this neo-mklinux lets multiple independent Linux kernels run simultaneously on bare metal. There is still a host kernel which handles the carving up of hardware resources to the newly spawned kernels, but unlike with a hypervisor there are no abstraction or translation layers.

In theory this should mean basically perfect isolation between kernels, which is one of the main selling points along with increased performance. Compared to running KVM guests the provided benchmarks show much lower latency, at between parity to two times faster.

A website is provided with instructions to get started, along with architectural details if that’s your thing.

The Mactini: A Computer That Does Almost Nothing

August 27, 2026 by Maya Posch 13 Comments

Recently [Tucker Osman] brought to life what once was just a meme created by the BBC as it poked fun at Apple’s push for ever smaller devices that also dropped many features along the path towards questionable innovation. This ‘Mactini’ was a super-small laptop, with just a single button that did everything, befitting the overpriced more-money-than-sense status symbol vibe that [Jony Ive] brought to Apple.

The input method suggested in the BBC video involves convoluted patterns using the single button, which would be functional, albeit cumbersome. Even as [Tucker] set out on this mission to make the Mactini real, he had to answer a lot of questions, while sticking to the rules that it had to follow the rough form factor of the original and have the same features.

In lieu of overcomplicating things, he opted to use a 1.69″ ST7789V2-based SPI LCD along with a small RP2350-based board from Waveshare for the brains. Rather than just slapping the LCD example for the Pico board on it as firmware, he actually used DMA to do the screen data copying, freeing up a lot of CPU cycles.

The rest of the hardware was cobbled together from e-waste parts, including an iPad speaker and an audio amplifier from a scrap board. Video was handled using Motion JPEG decoding for a not-horrible-framerate. All of this was put into a 3D printed case that was designed in FreeCAD, to make the Mac that [Ive] could only have dreamed of back in the 2000s.

Continue reading “The Mactini: A Computer That Does Almost Nothing” →

The Farador Quack Medical Device

August 27, 2026 by Maya Posch 10 Comments

Over the centuries there have been an incredible number of purported medical devices released onto the market, with some having more outrageous claims than others. Released in the 1910s and produced into the 1920s, the Farador electrotherapeutic device claimed to be a thermoelectric device that would cure all disease conditions. In a recent video over at the [Our Own Devices] channel we get an in-depth look at this device and its usage instructions.

It's a thermoelectric generator. Sort of. (Credit: Our Own Devices, YouTube) — It’s a thermoelectric generator. Sort of. (Credit: Our Own Devices, YouTube)

On the Smithsonian’s website you can see the version they’ve got. It’s not identical, but the working principle remains the same — after bypassing the whole ‘is this the right treatment’ questionnaire because it’s a cure-all device, you take the main metal device and its connected electrodes out of the box.

Unlike similar devices of the era that applied an actual electrical current using batteries or similar, this Farador purportedly uses thermoelectric power generation, but there’s no clear hot or cold side to what would be the generator. Despite this, about 20-30 mV can be measured across the electrodes, so surely it’s working?

As it turns out, the Farador is just one of many fake medical devices that cloned the original Electropoise. Naturally such devices have been disassembled by many over the past decades, and as it turns out they are all empty inside, or at least devoid of any mechanisms. Much like many of such fake medical devices today, they mostly bank on the placebo effect. This placebo effect can be so strong that it’s even a confounding factor in real medical trials and medicine.

The more involved and complex the purported medical treatment seems, the stronger the effect tends to be. For the Farador the complex instructions, apparently high-tech thermoelectric generator and such all help to create the illusion and could thus be construed to be the main feature of this product.

Continue reading “The Farador Quack Medical Device” →

Sloan Digital Sky Survey Releases New Map Of Supermassive Black Holes

August 26, 2026 by Maya Posch 2 Comments

The Universe is a large place, yet despite it being mostly empty space, there are still a lot of things to find and catalogue. This includes mildly terrifying things like supermassive black holes (SMBHs), one of the study subjects of the Sloan Digital Sky Survey (SDSS) project. In their 20th data release of the fifth all-sky survey (SDSS-V), the results of the Black Hole Mapper (BHM) program provides a lot of new insights into these SMBHs.

For a good primer on the SDSS’s ongoing survey, you can read this paper by [Kollmeier] et al. from 2017 in which this fifth survey and its three programs, including the BHM, are explained. This comes after four previous phases of the SDSS, all of them focusing on multispectral imaging and spectroscopic redshift survey with the 2.5 m Apache Point Observatory (APO) in New Mexico.

With SDSS-V a second 2.5 m observatory at Las Campanas (LCO) was added, with both observatories combined able to observe the entire sky, not just as static images, but also any changes over time. While these observations are in the near-infrared, combined with the data from other observatories this gives us probably one of the most comprehensive maps of the Milky Way and everything therein, including black holes.

This 20th data release gives us one of the clearest glimpses yet at the formation, growth and behavior of SMBHs and similar objects over time. A big part of this achievement are the automatic positioning robots at the observatories that handle the fiber optics that feed spectrographs, enabling faster and more accurate observations.