Author: Tyler August

584 Articles

Spin FV-1 Emulator Simplifies Sound Pedal Development

September 12, 2026 by 12 Comments

If you’ve never heard of the Spin Semiconductors FP-1 digital signal processor chip, don’t worry– that just means you haven’t been deep into guitar petals and audio effects hardware lately. [adamjvr], a.k.a. [avr] has, and he’s gone to the point of creating a PC-based emulator of this sound chip to simplify development.

If you don’t see the utility, stop and think about the development cycle without a simulation like this: you program, you flash to a board, and you test there. Not only does the ‘flash to the board’ step add time and friction, you do also have a limited number of flashes on the board’s memory. With an emulator on your PC, the workflow tightens to ‘code, test’ and you don’t flash the board until the simulated DSP is doing the sounds you want it to.

As for the FV-1 itself, it’s an interesting little chip in that it’s quite a full-featured DSP– rather, it’s small instruction set is focused entirely on audio effects. If you’re into that world– be it guitar pedals or otherwise– you may find this project very useful. There are releases for Linux, MacOS and Windows, and it’s all open-source on GitHub, under the Mozilla Public License. It’s not the most common choice, but we’re hardly going to complain about licenses to anyone willing to share their hard work.

If you like the idea of testing your work before you go to the bench, we’ve seen software that offer the same functionality for Arduino projects, as well as other AVR and PIC micros. It’s been a while since we featured a programmable guitar pedal, so we hope this tool enables others to rock out.

One module of the relay computer

2026 Retrocomputing Challenge: 16-Bit Homebrew Relay Computer

September 12, 2026 by 6 Comments

You want Retro? We did, when we started our retrocomputing challenge. [Peter] decided that transistors weren’t retro enough, and sent us this lovely homebrew relay computer, complete with 16- bit CPU, which is rather more bits than one normally associates with clicky clacky contacts.

The architecture is very simple– it just uses an accumulator register, ACCU, and goes from there. All mathematics and save/load operations go through ACCU. There whole instruction set is only 19 commands, and he’s used that set to program such lovely things as calculating 3 digits of Pi– which only took 8 minutes of glorious clicking. There’s a demo video of that embedded below. [Peter] has even implemented a display by hooking his computer to a 32×32 LED matrix, but don’t expect it to relay updates really quickly.

If this computer looks familiar, it’s because its earlier incarnation was one of the more “extra” entries in last year’s one-hertz challenge, where it was used to blink an indicator lamp. Yes, even relay computers apparently get started with the “blinky” sketch.

If you want in on the fun, our retrocomputer challenge runs until October 27th, so there’s lots of time left to turn back the clock.

Continue reading “2026 Retrocomputing Challenge: 16-Bit Homebrew Relay Computer” →

Hand-Coded ASM Powers Homebrew SNES Game

September 11, 2026 by 7 Comments

Nintendo has made many game consoles in its long history — one that famously overlaps that of the Ottoman Empire — but only one of them was ever Super. It’s that console, the Super Nintendo Entertainment System, that [Inkbox] has decided to delve deeply into as he crafts a game in assembly using all the hardware tricks he can.

Hardware tricks he’ll need, given he’s limited to the two 64 kB RAM banks and 3.58 MHz Ricoh 6502-based CPU. Even the 4 MB limit he sets for a historically-accurate homemade cartridge seems positively claustrophobic by modern standards. The game he’s after making is a top-down adventure game a la Zelda, and [Inkbox] gets right into the weeds explaining how the SNES works as he shows his work in this nearly hour long video. If you’re looking for a deep dive into the architecture, along with how it is meant to be used, you could certainly find worse sources. Everything from the different graphics modes to what registers handle sound are covered in this and the previous video in the series.

We can’t help but call out his dedication to open source — the SNES Sound Engine he has put up on GitHub looks like it could be a real asset to anyone else doing this kind of homebrew. The game itself is on itch.io and is pay-what-you-want.

[Inkbox] doesn’t just limit himself to the SNES’s 6502-esqe assembly — he’s done impressive work in x86 ASM, too. Continue reading “Hand-Coded ASM Powers Homebrew SNES Game” →

This Circuit Sculpture Is An ESP32-Powered Console

September 11, 2026 by 10 Comments

Expressif might not have intended the ESP32-S3 to become an emulation powerhouse, but that’s certainly what has happened. The little microcontroller seems perfect for recreating the Game Boys or Game Gears of years past, and there are a lot of software options to that end. Having grabbed firmware off a github repo, you still need a physical build to hold, and that’s where this one by [HVT Lab and Huy Vector] stands out.

As you can see, they’re letting everything hang out — not even in a 90s-inspired clear case, but with an open frame of soldered brass, with just a small strip of 2 mm clear acrylic to help stabilize the buttons. That appears to be held with cyanoacrylate glue, but it’s brass and solder doing the majority of the structural work here. We might be a little more confident tossing this lovely device in a bag or pocket if the whole device was boxed in with that acrylic — shorting the exposed power bus on your keys sounds like a bummer — but we can’t argue with the aesthetic vision here. It’s a lovely build on the physical end.

From the video it looks like the software is based on Retro-Go, which we’ve seen in use before. In any case, there are plenty of open source projects you could load onto the ESP32-S3 powering this circuit sculpture, though, from NES to IBM PC.

Continue reading “This Circuit Sculpture Is An ESP32-Powered Console” →

If It’s Electronic Paper, Why Not Print To It?

September 10, 2026 by 42 Comments

E-ink is supposed to be the electronic version of dead-tree paper, but there’s one enormous difference: how you get your images and text onto it. For paper, you print on it. E-ink? Well, it depends on what it’s hooked up to. If it’s an ESP32C3-based Xteink X4 and X3, then you can just print to that, too, thanks to [Nishant Joshi]’s fork of the popular CrossPoint firmware.

The fork implements the Internet Printer Protocol, IPP, on the ESP32-C3. It makes loading documents a breeze: select the printer in your operating system, and press print. To the computer, the reader advertises itself as a printer that provides monochrome, single-sided output at 300 DPI on A5 paper, and accepts Apple raster and PWG raster formats. Of course these raster images are enormous compared to the paltry RAM available on the microcontroller, so pixels are received and written row-by-row — both to the screen directly, and to the SD card for later perusal. That makes a folder on the SD card the equivalent of a printer’s output tray.

This interface is amazing in its simplicity, and we’d love to see it in other E-ink devices. It reminds us somehow of AlphaSmart word processors — which are still relevant today in large part because their ‘file transfer’ mechanism is to pretend to be a USB keyboard and type the document onto your computer. As long as IPP is available, so too will you be able to get documents onto this e-reader.

Local LLMs Can Work Better Than Claude, At Least For Some

September 9, 2026 by 59 Comments

This is going to be a very personal question, because when you’re talking cloud vs local anything, it comes down to this: how much are you willing to pay for independence? The local option might save you long term, or it might never pay off the capital investment. It will almost certainly cost you your time to set up and maintain your own system — but what you get back is independence. With LLMs, traditionally you lose quite a bit of performance, but as [Anurag Singh] points out on XDA Developers, a lesser model might actually let you get more done, depending on your workflow.

[Anurag] had been on the 20$/month plan with Anthropic when he decided that the scratch just wasn’t worth the sniff– he was hitting usage limits he couldn’t stand at that level, but couldn’t justify a higher tier of access. So he decided to try a local LLM, even though all he had was a 16 GB MacBook Air M5, not a beefy workstation. Since his workflow isn’t so much ‘vibe code the whole thing for me’ as ‘help me find where I went wrong here, electronic rubber duck’, Qwen2.5 Coder 14B proved more than adequate for his use case.

It can’t understand all the moving parts of a large project as well as Claude can — not surprising given how old it is and how much memory it has to work with — but that’s [Anurag]’s job. He’s the programmer, it’s just the assistant. For his use case, he can make use of his existing hardware and having the the LLM right in VS Code is allows for a speedy workflow.

Your millage may vary, but if you want to get into locally running LLMs, we can point you at the easy ways to get started. Depending on your hardware, you might want to grab another GPU.

Sick Of Wayland Vs. Xorg? How About GEM?

September 9, 2026 by 26 Comments

Between lawsuits from Apple, and Microsoft being Microsoft, Digital Research’s GEM desktop for DOS never really had a chance. It did have another life on Atari home computers, but it’s the DOS version that provided the code for [Tomaz Stih]’s Linux port of the GEM graphical desktop — which isn’t a WM or DE for X or Wayland, for the record. It is entirely it’s own graphical display that will live in the framebuffer of a minimal Linux installation.

[Thomaz] is leveraging DR’s original code — or at least what started as DR’s code before a series of acquisitions and open sourcing — via OpenGEM and FreeGEM. Sample applications include the clock and calendar, but [Thomaz] says the APIs are compatible with Atari ST applications; presumably given the codebase the it will match the DOS version as well.

Much like when it was originally crushed betwixt Macintosh System and Microsoft Windows, we doubt many will be rushing out to use GEM instead of Wayland or XServer on Linux, but there may well be some use cases. If nothing else, it’s got to be lightweight.

If you missed the Digital Research GEM saga, this might get you up to date. If the idea of it running on Linux tickles your funny bone, you might enjoy seeing GEM on an AlphaSmart word processor.