Watch VCF Southwest In Retrotastic SGI-Edited Footage

October 24, 2026 by No comments

There’s just something about backing way, way off the cutting edge to rediscover the simpler joys of yesteryear. We’ve got a contest about to wrap up along those lines, and there are festivals celebrating all things retro in the world of computers and electronics the world over. Vintage Computer Festival (VCF) Southwest happened back in the summer, but [Wave Design] just posted a gloriously retro retrospective, complete with the full 1990s video-editing workflow, completed on an SGI O2.

The footage was recorded on a 1990s vintage DV camera, and read using a somewhat-newer Sony tapedeck that we sadly have to admit also counts as retro in these late days. That gets piped into a vintage SGI O2 workstation that would have had us drooling back in the day, whose only concession to modernity is the inclusion of an NVMe SSD through a collection of adapters we can only call a hack. This may be burying the lede deep, but it turns out there is now an NVMe driver for IRIX 6.5. Using a modern SSD saves [Wave] from dealing with the literal stack of external drives video editing called for back in the day, so we can’t hardly blame him.

After the hardware walk-through, [Wave]’s video gets into the software, which is surprisingly modern. The footage he creates is decidedly not. It looks exactly like it was broadcast in 1996, perhaps following an episode of ReBoot — which conveniently enough, also used SGI workstations in its production, though with a decidedly rarer type of digital video tape.

Continue reading “Watch VCF Southwest In Retrotastic SGI-Edited Footage” →

A Walkie Talkie Interface For Claude

October 24, 2026 by 4 Comments

[Bookmari] had a problem — working as a delivery driver, they wanted to work on various projects with Claude Code while out and about. Unfortunately, it simply wasn’t practical to write prompts and read answers on the job. Thus, they whipped up Walkie Claudie, so they could use their voice instead.

The concept is simple enough, it’s an interface that lets you talk to Claude using speech recognition, and lets Claude talk back to you with a text-to-speech engine. It runs on a smartphone, with a direct network connection to the PC running Claude, though you can use a VPN if you’re distantly located. [Bookmari] has a push-to-talk setup so that pushing a button on their Bluetooth earbuds lets them talk directly to Claude. There’s also a special mode to keep the channel active during long pauses if you need a while to collect thoughts and vocalize them. Just for fun, the interface is styled like an old-school walkie LCD, and there’s fun little details like synthesized squelch and channel-switch noises and so on.

If you’re looking for a way to stay hooked up to your AI assistant at all times, this could prove useful to you. Alternatively, consider if maybe it’s worth taking a break sometimes, or check out other Claude Code projects we’ve seen of late.

Continue reading “A Walkie Talkie Interface For Claude” →

Using An Unmodded GBA As A Music Synth

October 23, 2026 by No comments

The style and sound of older video games is unique enough that they’re still copied in relatively modern games like Undertale, Celeste, or Shovel Knight. There’s also a vibrant chiptune community making music on the older hardware directly. Often this involves hardware modding or otherwise finding chips from older gaming systems to replicate that unique retro gaming sound authentically. But disassembling older systems is not always necessary. Take a look at this Game Boy Advance synthesizer which uses the GBA hardware with no modifications at all.

The key to making this work is the GBA’s multiboot feature, which allowed these systems to send executable code over a link cable to other consoles which didn’t have cartridges. This meant that friends could play multiplayer games without each one needing their own cartridge, but it also means that nowadays people can send their own custom software directly to the console’s RAM without much extra effort. To run the synthesizer software, the GBA is connected to a computer, the software is started, and then when the GBA is powered on the snythesizer is automatically loaded into its RAM. The audio output is played over the headphone jack, and various controls are available on the computer and on the console.

In the video linked below, [Andy] is using the GBA with some other musical hardware and the sounds he’s getting from the unmodified console are impressive. It could certainly be a go-to for anyone interested in getting started in this style of music or who doesn’t want to do something like take apart an original Sega Genesis for the audio circuitry.

Continue reading “Using An Unmodded GBA As A Music Synth” →

RepRapMicron Uses Fibre Optics To Print Tiny Benchy In Resin

October 23, 2026 by 5 Comments
The 0.5 mm Benchy made with the MicroRepRap UV head.
The 0.5 mm Benchy made with the MicroRepRap UV head.

The RepRapMicron (also µRepRap) is pretty much the microscopic take on what RepRap did for more macroscale manufacturing, with the most recent innovation being a UV print head, called the PIKA UV Head. What this does is use off-the-shelf optical fiber and UV LED modules to create 3D structures in-situ in a UV resin, allowing for pretty small structures to be printed, down to a resolution of about 9 µm.

More photos of prints can be found on the blog page with links to YouTube videos. It’s naturally somewhat tricky to get clean photographs of a 3D print that’s small enough to lose forever if you so much as sneeze or breathe too loudly.

For the UV head assembly a single mode fiber optical cable was used in the form of a regular patch cord that got trimmed a bit with a hacksaw. This was used in combination with a “3W” UV LED module, which may or may not be its true rating, but it was definitely able to cure the SLA resin. The used resin was regular eSun Standard Resin.

Afterwards you have to do the typical SLA post-processing, including cleaning off of liquid resin – both the part and fiber – and curing the part. So far results are pretty decent, with overhangs still being a weak spot that will be addressed in future revisions.

A black 3D printed machine sits on a workbench. A coil of copper wire is suspended from one side of it, and a screen on the front of it reads "Homing".

Automatic Coil Winder Takes The Tedium Out Of Actuators

October 23, 2026 by 3 Comments

Anyone who’s ever built their own motors knows how tedious winding the coils soon becomes; in [Larry]’s case, the issue was even worse. He’s building his own flip-dot matrix display, and each dot uses two electromagnetic coils to flip a magnet in the dot. Rather than wind each of these by hand, therefore, he built his own coil-winding machine.

The coil winder uses two stepper motors: one to wind wire onto the bobbin, and one to move the wire guide carriage back and forth, distributing the wire evenly across the bobbin. The bobbin is held in place by a retainer, which doubles as a tie point for the end of the wire. The spool of wire rotates on a pair of bearings, and the wire is fed between two pieces of foam to provide adjustable tension. The housing is mostly 3D-printed, with some metal rods, bearings, and belt drives fleshing out the structure. On the electronics side, a Teensy controls the winder, with an OLED display and a rotary encoder for control. Before beginning on a coil, it homes the guide carriage against an end-stop switch, then winds on layers, keeping track of the number of layers applied.

We’ve seen a few coil winders here in the past, including a 3D printer adapted to winding stators. For more on this winder’s application, check out [Larry]’s flip-dot design.

Reconstructing The Ancient Chinese Storm Of Crows Weapon

October 23, 2026 by 13 Comments

The Chinese had been using large crossbows – akin to Greek and Roman ballistae – for warfare for many of the same reasons that European armies loved them. Their single, large arrow was effectively unstoppable, though this also was rather useless against large groups of infantry unless they were so kind to neatly line up. Old Chinese records mention a special kind of ammunition, called a cup arrow, or ‘storm of crows’, which involves launching many smaller arrows instead of a single large one, a feat that [Tod] really wanted to try and recreate.

In itself this doesn’t sound too complex: just grab some arrows, loosely tie them together in a bundle and slap them on the crossbow. Yet with the immense forces applied on this bundle it clearly turns out that the engineering challenge isn’t quite that straightforward, as the arrows love to scatter wildly in all directions or otherwise be rather unpredictable.

Although we can find historical references to multiple bolt siege crossbows being used, details are sparse on how the Chinese engineers addressed these aforementioned issues, so [Tod] tries a range of approaches to try and make it work on his own siege crossbow. Unfortunately he wasn’t able to make it work reliably, but he says he’ll be back with a range of improvements, with the community invited to pitch in their own ideas.

These type of weapons were very commonly used in China and surrounding nations from hundreds of years BCE to around the 16th century CE, when black powder was used to launch projectiles like fire arrows from a Huo Che or the Korean equivalent of the Hwacha, effectively multiple rocket launchers, not unlike the MLRS units seen in militaries today.

Continue reading “Reconstructing The Ancient Chinese Storm Of Crows Weapon” →

Running A Philips CD-i Off USB-C

October 23, 2026 by 2 Comments

The Philips CD-i is a console with many shortcomings, and those include the power supply. For whatever reason, the engineering team decided it should use an 8P8C connector just like Ethernet. Thus, just like your Ethernet cables, it has that annoying problem of the tab snapping off all the time. [MattKC] wondered if the CD-i could benefit from a USB power upgrade instead, and set about making it a reality.

The plan was simple enough—get the CD-i running off of USB-C instead of the ungainly original power supply that shipped with the unit. Given the console runs almost exclusively off of 5 V power, it should have been pretty easy. Only, the original spec adds one little detail that makes things a bit harder. The console is designed to draw up to 3 A from the 5 V line, while also having a -5 V line at 0.2 A. If not for that negative supply, it would have been easy to run the unit off any old 15 W USB-C charger spitting out 5 V. That extra negative line complicates things, because while the negative line could be created with some supporting electronics, it’s hard to find that extra watt from most chargers. While there are plenty of higher-wattage USB-C chargers, the majority tend to use higher voltages to deliver the additional power, capping the 5 V output at 3 amps.

Thus, it was necessary to work a little harder. [MattKC] decided to build a board that would negotiate with a USB-C charger for 9 V operation to get the power budget necessary. This would then be stepped down to 5 V, while there would also be an inversion step to supply the -5 V line, too. A CH221K chip does the job of negotiating a 9 V USB-C power supply, while a TPSM84538 steps the voltage down to 5 V with the capacity to supply up to 5 A. An LT3580 chip then inverts this voltage for the 5 V line. There’s also a power switching circuit on board because the CD-i included some of that functionality in the original power brick.

If you’ve got a CD-i and you’re sick of fussing with the original power supply, this could be a great upgrade. We’ve also explored USB Power Delivery in detail before, if you need a primer.