This Home Made Laptop Raises The Bar

January 23, 2025 by 54 Comments

With ready availability of single board computers, displays, keyboards, power packs, and other hardware, a home-made laptop is now a project within most people’s reach. Some laptop projects definitely veer towards being cyberdecks while others take a more conventional path, but we’ve rarely seen one as professional looking as [Byran Huang]’s anyon_e open source laptop. It really takes the art to the next level.

The quality is immediately apparent in the custom CNC-machined anodised aluminium case, and upon opening it up the curious user could be forgiven for thinking they had a stylish commercial machine in their hands. There’s a slimline mechanical keyboard and a glass trackpad, and that display is an OLED. In fact the whole thing had been built from scratch, and inside is an RK3588 SoC on a module sitting on a custom-designed motherboard. It required some effort for it to drive the display, a process we’ve seen cause pain to other designers, but otherwise it runs Debian. The batteries are slimline pouch cells, with a custom controller board driven by an ESP32.

This must have cost quite a bit to build, but it’s something anyone can have a go at for themselves as everything is in a GitHub repository. Purists might ask for open source silicon at its heart to make it truly open source, but considering what he’s done we’ll take this. It’s not the first high quality laptop project we’ve seen by any means, but it may be the first that wouldn’t raise any eyebrows in the boardroom. Take a look at the video below the break.

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Shellcode Over MIDI? Bad Apple On A PSR-E433, Kinda

January 23, 2025 by 6 Comments

If hacking on consumer hardware is about figuring out what it can do, and pushing it in directions that the manufacturer never dared to dream, then this is a very fine hack indeed. [Portasynthica3] takes on the Yamaha PSR-E433, a cheap beginner keyboard, discovers a shell baked into it, and takes it from there.

[Portasynthinca3] reverse engineered the firmware, wrote shellcode for the device, embedded the escape in a MIDI note stream, and even ended up writing some simple LCD driver software totally decent refresh rate on the dot-matrix display, all to support the lofty goal of displaying arbitrary graphics on the keyboard’s dot-matrix character display.

Now, we want you to be prepared for a low-res video extravaganza here. You might have to squint a bit to make out what’s going on in the video, but keep in mind that it’s being sent over a music data protocol from the 1980s, running at 31.25 kbps, displayed in the custom character RAM of an LCD.

As always, the hack starts with research. Identifying the microcontroller CPU lead to JTAG and OpenOCD. (We love the technique of looking at the draw on a bench power meter to determine if the chip is responding to pause commands.) Dumping the code and tossing it into Ghidra lead to the unexpected discovery that Yamaha had put a live shell in the device that communicates over MIDI, presumably for testing and development purposes. This shell had PEEK and POKE, which meant that OpenOCD could go sit back on the shelf. Poking “Hello World” into some free RAM space over MIDI sysex was the first proof-of-concept.

The final hack to get video up and running was to dig deep into the custom character-generation RAM, write some code to disable the normal character display, and then fool the CPU into calling this code instead of the shell, in order to increase the update rate. All of this for a thin slice of Bad Apple over MIDI, but more importantly, for the glory. And this hack is glorious! Go check it out in full.

MIDI is entirely hacker friendly, and it’s likely you can hack together a musical controller that would wow your audience just with stuff in your junk box. If you’re at all into music, and you’ve never built your own MIDI devices, you have your weekend project.

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Brick Layer Post-Processor, Promising Stronger 3D Prints, Now Available

January 23, 2025 by 45 Comments

Back in November we first brought you word of a slicing technique by which the final strength of 3D printed parts could be considerably improved by adjusting the first layer height of each wall so that subsequent layers would interlock like bricks. It was relatively easy to implement, didn’t require anything special on the printer to accomplish, and testing showed it was effective enough to pursue further. Unfortunately, there was some patent concerns, and it seemed like nobody wanted to be the first to step up and actually implement the feature.

Well, as of today, [Roman Tenger] has decided to answer the call. As explained in the announcement video below, the company that currently holds the US patent for this tech hasn’t filed a European counterpart, so he feels he’s in a fairly safe spot compared to other creators in the community. We salute his bravery, and wish him nothing but the best of luck should any lawyer come knocking.

So how does it work? Right now the script supports PrusaSlicer and OrcaSlicer, and the installation is the same in both cases — just download the Python file, and go into your slicer’s settings under “Post-Processing Scripts” and enter in its path. As of right now you’ll have to provide the target layer height as an option to the script, but we’re willing to bet that’s going to be one of the first things that gets improved as the community starts sending in pull requests for the GPL v3 licensed script.

There was a lot of interest in this technique when we covered it last, and we’re very excited to see an open source implementation break cover. Now that it’s out in the wild, we’d love to hear about it in the comments if you try it out.

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It’s Never Too Late For A Fixed SimCity 2000

January 23, 2025 by 32 Comments

Some retro games need a little help running on modern systems, and it’s not always straightforward. SimCity 2000 Special Edition is one such game and [araxestroy]’s sc2kfix bugfix DLL shows that the process can require a nontrivial amount of skill and finesse. The result? A SimCity 2000 Special Edition that can run without crash or compromise on modern Windows machines, surpassing previous fixes.

SimCity 2000 Special Edition was a release for Windows 95 that allowed the game to work in windowed glory. The executable is capable of running under modern Windows systems (and at high resolutions!) but it’s got a few problems lurking under the hood.

There are crash issues during save/load dialog boxes, and a big visual problem. Animations rely on palette swapping for the game’s animations, and the technique originally used simply does not work right on modern displays. A fellow named [Guspaz] created SC2KRepainter to partially deal with this by forcing window redraws, but it’s an imperfect fix with a few side effects of it’s own.

[araxestroy]’s new solution eliminates dialog crashes and restores the animations, letting them look exactly as they should even on modern systems. It does this elegantly not by patching the executable or running a separate process, but by making the changes in memory at runtime with the help of a specially-crafted .dll file. Just grab winmm.dll from the latest release and put it into the same folder as simcity.exe, then launch the game to enjoy it as the designers intended!

Patching old games is a scene that helps ensure not only that classics never die, but also helps them be appreciated in new ways. Heck, even E.T. for the Atari 2600 has gotten tweaked, highlighting the misunderstood nature of the game in the process.

A Ribbon Microphone Is Harder Than You Think

January 22, 2025 by 21 Comments

There’s a mystique around ribbon microphones due to their being expensive studio-grade items, which has led more than one experimenter down the rabbit hole of making one. [Catherine van West] has posted her experiments in the field, and it makes for an interesting read.

The recipe for a ribbon microphone is very simple indeed — suspend a corrugated ribbon of foil in a magnetic field, and take the voltage across the ribbon. But that simplicity hides some significant issues, as the foil is much thinner than the stuff you might roast your turkey under. Such lightweight foil is extremely fragile, and the signwriters leaf used here proved to be difficult to get right.

Then when the microphone is built there’s still the exceptionally low impedance and small voltage across the ribbon to contend with. The choice here is a transformer rather than a FET preamp, which surprised us.

The result is by all accounts a decent sounding microphone, though with some hum pickup due to difficulty with shielding. Should you give one a try? Maybe not, but that hasn’t stopped others from giving it a go.

Electric Vehicle Charging Heats Up

January 22, 2025 by 64 Comments

As the electric vehicle takeover slowly lumbers along, marginally increasing efficiencies for certain applications while entrenching car-centric urban design even further, there are some knock-on effects that are benefiting people and infrastructure beyond simple transportation. Vehicle-to-grid technology has applications for providing energy from the car back to the grid for things like power outages or grid leveling. But [Technology Connections] is taking this logic one step further. Since a large number of EV owners have charging stations built into their garages, he wondered if these charging stations could be used for other tasks and built an electric heater which can use one for power.

This project uses a level 2 charger, capable of delivering many kilowatts of power to an EV over fairly standard 240V home wiring with a smart controller in between that and the car. Compared to a level 1 charger which can only trickle charge a car on a standard 120V outlet (in the US) or a DC fast charger which can provide a truly tremendous amount of energy in a very short time, these are a happy middle ground. So, while it’s true a homeowner could simply wire up another 240V outlet for this type of space heater or other similar application, this project uses the existing infrastructure of the home to avoid redundancies like that.

Of course this isn’t exactly plug-and-play. Car chargers communicate with vehicles to negotiate power capabilities with each other, so any appliance wanting to use one as a bulk electric supply needs to be able to perform this negotiation. To get the full power available in this case all that’s needed is a resistor connected to one of the signal wires, but this won’t work for all cases and could overload smaller charging stations. For that a more complex signalling method is needed, but since this was more of a proof-of-concept we’ll still call it a success. For those wanting to DIY the charger itself, building one from the ground up is fairly straightforward as well.

Thanks to [Billy] for the tip!

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A light-up clock displays the day of the week.

What Day Is It Again? Check The Clock

January 22, 2025 by 7 Comments

If you’re lucky enough to work from home, you’ll soon find that it presents its own set of challenges, mostly related to work/life balance. It can get so bad that you don’t know what day of the week it is. Really. Ask us how we know.

Rather than miss a meeting (or a day off), prolific hacker [Arnov Sharma] created this day of the week clock. It uses a customized LED driver board with seven sets of three LEDs, each driven by a MOSFET. Each MOSFET is controlled by a DFRobot Mini Beetle ESP32-C3. It runs on a 2200 mAh, 3.7 V lithium-ion battery.

While this is mostly PCBs, there are three printed parts that turn it into a displayable object. We really like the look of this clock — it has just the right amount of pizazz to it and reminds us of a and old movie marquee. Be sure to check out the great build instructions.

We love a good clock around here. In case you missed it, here is the latest from [Moritz v. Sivers] that uses a caustic lens to display the time.