Raspberry Pi combined reboot/shutdown button demo

NB: this version doesn’t actually do the rebooting or shutting down: it’s a demo. This one does, though …

Here’s how you might have just one button being a reset button (hold down for two seconds) or a shutdown button (hold down for five):

taking the whole proto-plate thing a bit far …

Yes, it’s a very tiny microcontroller board and breadboard doohickey. The board’s a Trinket M0 running CircuitPython 2.0. The base is laser-cut birch ply. Definitely #smol  at less than 75 × 55 mm …

Here’s the SVG for laser cutting:
To build it, you’ll need:

  • 3 mm birch ply (at least 75 mm × 55 mm)
  • Adafruit Trinket M0
  • Tiny breadboard: either a tiny or a Mini one. The board markings match either.
  • M2.5 screws and standoffs
  • 4× stick-on feet
  • 2× 1×5 female header — I cut down a 1×12 female header.

If I were to redesign this, I’d:

  1. make the breadboard outline a score line rather than an etched area. Scoring is much quicker than etching.
  2. Mark pin definitions on the plate. They’re a bit hard to read on the Trinket M0.

Obligatory blinky code for running a 16 LED NeoPixel Ring and the LED in the middle of the Trinket:

*ALL* of the memory …

World domination soonish!

I’ve got a whole bunch of bytes free now I’ve upgraded my 6502 40th Anniversary Computer Badge to 32KB of RAM! I suspect I’ll end up as I usually do, Corvax-style …

Important research: was the Eudora “New Mail” chime from Ren & Stimpy’s “LOG”?

Inspired (obliquely) by this Metafilter post, I set out to answer a burning question.

LOG chime

This occurs from second 36 to second 38 of this video:

The chime when extracted without further processing, sounds like this:

(direct link: Original-Log-Commercial_The-Ren-and-Stimpy-Show.wav)

Eudora chime

I found a copy of Eudora Mail 1.44 for Windows (bundled up in an archive quaintly called “internet.zip”) here. The EUDOR144.EXE file is itself a Zip archive, and contains several files. The important one is WEUDORA.EXE (722,944 bytes; SHA256 checksum a35f2ef1e95242228381d9340fff0995f4935223f88a38b9200717107252dfb9).

This is a Windows 16 “New Executable” (NE) file, and I used panzi/mediaextract to scan and extract the RIFF/WAV data:

(direct link: WEUDORA.EXE_000a8200.wav)

They sure sound similar. But are they … the same?


I made sure that both samples were set to the same rate, and I applied simple amplification in Audacity so that they both had a peak volume of -3 dB. Aligning the tracks as best I could, I got this:

Log audio on top, Eudora chime underneath

The Eudora sample is very slightly slower than the Log one. It might have been that the Eudora authors sampled the chimes from an analogue video tape. The match is remarkable, however, as they play together with only very slight phasing effects:

(direct link: Log_vs_Eudora-log_left-Eudora_right.wav)


Yes, the Eudora Mail “New Mail” chime did come from Ren & Stimpy after all.

MS Word will break your links!

I was pleased to see that my nerrrdy Bourgoin mini-zine got cited in an art workbook for schools: Islamic mosaics activity (Patterning) from MathWeave. Yay!

But the link in the workbook doesn’t work! I mean, it looks right:

While the real link is:

Only when you copy the bad URL do you see the problem:


Word has changed the pasted ‘-’s to ‘‐’s: that’s from U+002D HYPHEN-MINUS to U+2010 HYPHEN. You’d have thought that software that was smart enough to recognize an URL would also be smart enough not to do any messing with the characters in it …

Most of the Logic Apple II Library now on archive.org

Well, that’s all the disks I can find easily up on archive.org. There are some Apple IIgs disks still to do, and there might be some random disks lurking in another box, but that’s more than 485 disk images uploaded.

You can find them by going to Internet Archive Search: creator:”LOGIC (“Loyal Ontario Group Interested In Computers”)”.