Nostr notes by Stylus

Falling asleep the other night I was thinking about derivatives. ...

2026-05-06T22:02:33Z

Falling asleep the other night I was thinking about derivatives.

I can think of two functions that are their own derivatives: f(x) = 0 and f(x) = ex.

There's a pair of functions function such that each is its *second* derivative is itself: f(x) = e-x and g(x) = -e-x.

There's a group of functions such that its *fourth* derivative is itself, f(x) = sin(x), g(x) = cos(x), h(x) = -sin(x), k(x) = -cos(x)

Are there any functions with other numbers of derivative steps before they become equal to themselves again? 3, 5, 8, etc.

In the light of day, I think I see that we could define an "n-self-derivative function" by just setting the derivatives<code>f(0) = 1 f'(0) = -1/2 f''(0) = -1/2 f'''(x) = f(x) etc </code>

and that defines a unique Maclurin series.

But .. are there functions of this form that would arise naturally?

#maths #math #mathstodon #recreationalMathematics

Where in the world are the early reviews of the #Prusa3d ...

2026-04-30T17:47:48Z

Where in the world are the early reviews of the #Prusa3d #bondTech INDX toolchanger? I know to take such reviews with a tablespoon of salt, but I'm really surprised there aren't a raft of youtube videos out there from folks who got shipped early units by Prusa specifically so there would be video reviews out at the same time the thing went in the store.

Of course, since Saturday it also went back out of the store reportedly due to selling through an initial production run.

#3dPrinting

https://en.wikipedia.org/wiki/Adam_Baldwin#GamerGate Possibly ...

2026-03-12T16:23:58Z

In reply to nevent1q…g92v
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https://en.wikipedia.org/wiki/Adam_Baldwin#GamerGate Possibly claimed to coin the term GamerGate & popularized misinfo about Zoë Quinn

I know, the p of p-adics have to be primes .. but today I learned ...

2026-02-12T23:07:13Z

In reply to nevent1q…56wq
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I know, the p of p-adics have to be primes .. but today I learned that you might refer to the composite adic numbers as "g-adics," these were investigated by Gauss, and in 10-adic numbers there are 4 square roots of 1: https://arxiv.org/html/2510.11559v1#S3

> One Mayan inscription suggest that the Long Count was the ...

2026-02-12T18:05:08Z

In reply to nevent1q…gut8
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> One Mayan inscription suggest that the Long Count was the truncation to the last 5 “digits” of an even longer count, and that a Long Count value such as 9.15.13.6.9 was in fact 13.13.13.13.13.13.13.13.9.15.13.6.9 in this Even Longer Count (why 13 everywhere? I don’t know!).

for some reason this makes me think of p-adic numbers. infinitely repeating 13s on the left side of the date, why not.

This makes me think back: Around 2005 I wanted to drive XY ...

2026-02-07T14:26:54Z

In reply to nevent1q…xg4e
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This makes me think back: Around 2005 I wanted to drive XY displays with my PC and realized I had a DAC that was already driving at MHz rates: my VGA card. Of course, the blanking interval would always jerk the coordinates down to (0,0). So among my tricks was setting unreasonable video modes with the most horizontal pixels the CRTC would allow and as few lines as needed for the game's display.

It was pretty neat to be able to run MAME vector games on a proper display, with nothing more than a standard PC and a good analog scope, even if the display was never as crisp as the real thing.

ARM CPUs literally have a ["big if true" ...

2026-02-04T14:03:35Z

In reply to nevent1q…p53g
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ARM CPUs literally have a ["big if true" register](https://developer.arm.com/documentation/ddi0406/c/Application-Level-Architecture/Application-Level-Programmers--Model/Execution-state-registers/Endianness-mapping-register--ENDIANSTATE )

@npub1nf4…nqe4 re ...

2026-01-30T02:13:10Z

John Carlos Baez (npub1nf4…nqe4) re https://johncarlosbaez.wordpress.com/2026/01/28/tiny-musical-intervals/

The only problem I spot with the Python code is that the check for "non-trivial" triples is redundant. Except for <0,0,0> there should be no non-trivial triples, and that is already excluded. Instead, this means no triples closer than 10 micro-cents would be printed.

Removing this check and extending the search range gives some more values on the frontier:<code>0.000884 cents | 1+5.103919569e-07 | [-573, 237, 85] | Tenney: 1146.0 0.000187 cents | 1+1.077468461e-07 | [2033, 90, -937] | Tenney: 4351.3 0.000159 cents | 1+9.185490346e-08 | [399, -1412, 792] | Tenney: 4475.9 0.000028 cents | 1+1.589178367e-08 | [1634, 1502, -1729] | Tenney: 8029.2 0.000006 cents | 1+3.442373941e-09 | [-7470, 2791, 1312] | Tenney: 14940.0 0.000002 cents | 1+1.373041014e-09 | [-22109, 20086, -4189] | Tenney: 63671.1 </code>

none have as big a jump in cent accuracy as the quark of Baez.

quoting
note1fz2…8j0h

##

Tiny Musical IntervalsMusic theorists have studied many fractions of the form

2i 3j 5k
that are close to 1. They’re called **[5-limit commas](https://en.wikipedia.org/wiki/Comma_(music) )**. Especially cherished are those that have fairly small exponents given how close they are to 1. I discussed a bunch here:

• [Well temperaments (part 2)](https://johncarlosbaez.wordpress.com/2024/01/18/well-temperaments-part-2/ ).

and I explained the tiniest named one, the utterly astounding ‘atom of Kirnberger’, here:

• [Well temperaments (part 3)](https://johncarlosbaez.wordpress.com/2024/01/18/well-temperaments-part-2/ ).

The **[atom of Kirnberger](https://golem.ph.utexas.edu/category/2024/02/the_atom_of_kirnberger.html )** equals

2161 · 3-84 · 5-12 ≈ 1.0000088728601397
Two pitches differing by this frequency sound the same to everyone except certain cleverly designed machines. But remarkably, the atom of Kirnberger shows up rather naturally in music—and it was discovered by a student of Bach! Read my article for details.

All this made me want to systematically explore such tiny intervals. Below is a table of them. Some have names but many do not—or at least I don’t know their names. I list these numbers in decimal form and also in **[cents](https://en.wikipedia.org/wiki/Cent_(music) )**, where we take the logarithm of the number in base 2 and multiply by 100. (I dislike this blend of base 2 and base 10, but it’s traditional in music theory.)

Most importantly, I list the **[monzo](https://en.xen.wiki/w/Monzo )**. This is the list of exponents: for example, the monzo of

2i 3j 5k
is

[i, j, k]
In case you’re wondering, this term was named after the music theorist [Joseph Monzo](https://en.xen.wiki/w/Joseph_Monzo ).

I also list the **[Tenney height](https://en.xen.wiki/w/Tenney_norm )**. This is a measure of complexity: the Tenney height of

2i 3j 5k
is

∣i∣ log2(2) + ∣j∣ log2(3) + ∣k∣ log2(5)
The table below purports to list only 5-limit commas that are close to 1 as possible for a given complexity. More precisely, it should list numbers of the form 2i 3j 5k that are > 1 and closer to 1 than any number with smaller Tenney height—except of course for 1 itself.CentsDecimalNameMonzoTenney height498.041.3333333333https://en.wikipedia.org/wiki/Perfect_fourth">just perfect fourth[2, −1, 0]3.6386.311.2500000000https://en.wikipedia.org/wiki/Major_third">just major third[−2, 0, 1]4.3315.641.2000000000https://en.wikipedia.org/wiki/Minor_third">just minor third[1, 1, −1]4.9203.911.1250000000https://en.wikipedia.org/wiki/Major_second#Major_and_minor_tones">major tone[−3, 2, 0]6.2182.401.1111111111https://en.wikipedia.org/wiki/Major_second#Major_and_minor_tones">minor tone[1, −2, 1]6.5111.731.0666666667https://en.wikipedia.org/wiki/Semitone">diatonic semitone[4, −1, −1]7.970.671.0416666667https://en.wikipedia.org/wiki/Semitone">lesser chromatic semitone[−3, −1, 2]9.221.511.0125000000https://en.wikipedia.org/wiki/Syntonic_comma">syntonic comma[−4, 4, −1]12.719.551.0113580247https://en.wikipedia.org/wiki/Diaschisma">diaschisma[11, −4, −2]22.08.111.0046939300https://en.wikipedia.org/wiki/Kleisma">kleisma[−6, −5, 6]27.91.951.0011291504https://en.wikipedia.org/wiki/Schisma">schisma[−15, 8, 1]30.01.381.0007999172unnamed?[38, −2, −15]76.00.861.0004979343unnamed?[1, −27, 18]85.60.571.0003289700unnamed?[−53, 10, 16]106.00.291.0001689086unnamed?[54, −37, 2]117.30.231.0001329015unnamed?[−17, 62, −35]196.50.0471.0000271292unnamed?[−90, −15, 49]227.50.01541.0000088729https://golem.ph.utexas.edu/category/2024/02/the_atom_of_kirnberger.html">atom of Kirnberger[161, −84, −12]322.00.01151.0000066317unnamed?[21, 290, −207]961.30.000881.0000005104https://johncarlosbaez.wordpress.com/2026/01/28/tiny-musical-intervals/">quark of Baez[−573, 237, 85]1146.0

You’ll see there’s a big increase in Tenney height after the schisma. This is very interesting: it suggests that the schisma is the last ‘useful’ interval. It’s useful only in that it’s the ratio of two musically important commas, the syntonic comma and the Pythagorean comma, and life in music would be simpler if these were equal. All the intervals in this table up to the schisma were discovered by musicians a long time ago, and they all have standard names! But after the schisma, interest drops off dramatically.

The atom of Kirnberger has [such amazing properties](https://arxiv.org/abs/0907.5249 ) that it was worth naming. The rest, maybe not. But as you can see, I’ve taken the liberty of naming the smallest interval in the table the ‘quark of Baez’. This is much smaller than all that come before. It’s in bad taste to name things after oneself—indeed this is item 25 on the [crackpot index](https://math.ucr.edu/home/baez/crackpot.html )—but I hope it’s allowed as a joke.

Here is the [Python code](http://math.ucr.edu/home/baez/cultural/tuning/tiny_musical_intervals.py ) that should generate the above information. If you’re good at programming, please review it and check it!
from math import log2log3 = log2(3)
log5 = log2(5)commas = []max_exp_3 = 1200
max_exp_5 = 250for a3 in range(-max_exp_3, max_exp_3+1):
for a5 in range(-max_exp_5, max_exp_5+1):
if a3 == 0 and a5 == 0:
continue### # Find a2 that minimizes |a2 + a3 * log2(3) + a5 * log2(5)| target = -(a3 * log3 + a5 * log5) a2 = round(target) log2_ratio = a2 + a3 * log3 + a5 * log5 cents = abs(1200 * log2_ratio) if cents > 0.00001: # non-trivial tenney = abs(a2) + abs(a3) * log3 + abs(a5) * log5 commas.append((tenney, cents, a2, a3, a5))### #Find Pareto frontiercommas.sort(key=lambda x: x[0]) # sort by Tenney heightfrontier = []
best_cents = float('inf')
for c in commas:
if c[1] < best_cents:
best_cents = c[1]
frontier.append(c)### # Print resultsfor tenney, cents, a2, a3, a5 in frontier:
log2_ratio = a2 + a3 * log3 + a5 * log5
decimal = 2**log2_ratio
if decimal < 1:
decimal = 1/decimal
a2, a3, a5 = -a2, -a3, -a5
print(f"{cents:.6f} cents | {decimal:.10f} | [{a2}, {a3}, {a5}] | Tenney: {tenney:.1f}")
###

Gene Ward Smith In studying this subject I discovered that tiny 5-limit intervals were studied by [Gene Ward Smith](https://thmuses.wordpress.com/2021/02/16/gene-w-smith-has-died-from-covid-19/ ), a mathematician I used to see around on sci.math and the like. I never knew he worked on microtonal music! I am sad to hear that he died from COVID-19 in January 2021.

I may just be redoing a tiny part of his work: if anyone can find details, please let me know. In his memory, I’ll conclude with this article from the [Xenharmonic Wiki](https://en.xen.wiki/w/Gene_Ward_Smith ):

> Gene Ward Smith (1947–2021) was an American mathematician, music theorist, and composer.

> In mathematics, he worked in the areas of Galois theory and Moonshine theory.

> In music theory, he introduced wedge products as a way of classifying regular temperaments. In this system, a temperament is specified by means of a wedgie, which may technically be identified as a point on a Grassmannian. He had long drawn attention to the relationship between equal divisions of the octave and the Riemann zeta function.[1][2][3] He early on identified and emphasized free abelian groups of finite rank and their homomorphisms, and it was from that perspective that he contributed to the creation of the regular mapping paradigm.

> In the 1970s, Gene experimented with musical compositions using a device with four square-wave voices, whose tuning was very stable and accurate, being controlled by a crystal oscillator. The device in turn was controlled by HP 9800 series desktop computers, initially the HP 9830A, programmed in HP Basic, later the 9845A. Using this, he explored both just intonation with a particular emphasis on groups of transformations, and pajara.

> Gene had a basic understanding of the regular mapping paradigm during this period, but it was limited in practice since he was focused on the idea that the next step from meantone should keep some familiar features, and so was interested in tempering out 64/63 in place of 81/80. He knew 7-limit 12 and 22 had tempering out 64/63 and 50/49 in common, and 12 and 27 had tempering out 64/63 and 126/125 in common, and thought these would be logical places to progress to, blending novelty with familiarity. While he never got around to working with augene, he did consider it. For pajara, he found tempering certain JI scales, the 10 and 12 note highschool scales, led to interesting (omnitetrachordal) results, and that there were also closely related symmetric (MOS) scales of size 10 and 12 for pajara; he did some work with these, particularly favoring the pentachordal decatonic scale.

> Gene was among the first to consider extending the Tonnetz of Hugo Riemann beyond the 5-limit and hence into higher dimensional lattices. In three dimensions, the hexagonal lattice of 5-limit harmony extends to a lattice of type A3 ~ D3. He is also the first to write music in a number of exotic intonation systems. ####

> Historical interest> • > [> Usenet post from 1990 by Gene Smith on homomorphisms and kernels](https://en.xen.wiki/w/USENET_post_from_1990_by_Gene_Smith_on_homomorphisms_and_kernels )
> • > [> Usenet post from 1995 by Gene Smith on homomorphisms and kernels](https://en.xen.wiki/w/USENET_post_from_1995_by_Gene_Smith_on_homomorphisms_and_kernels )####

> See also > • > [> Microtonal music by Gene Ward Smith](https://en.xen.wiki/w/Microtonal_music_by_Gene_Ward_Smith )
> • > [> Hypergenesis58](https://en.xen.wiki/w/Hypergenesis58 )> (a scale described by Gene Ward Smith)####

> References > [1] Rusin, Dave. “> [> Why 12 tones per octave?](https://web.archive.org/web/20130731073247/http://www.math.niu.edu/~rusin/uses-math/music/12 )> ”

> [2] OEIS. Increasingly large peaks of the Riemann zeta function on the critical line: > [> OEIS: A117536](https://oeis.org/A117536 )> .

> [3] OEIS. Increasingly large integrals of the Z function between zeros: > [> OEIS: A117538](https://oeis.org/A117538 )> .

#Find

fwiw When I wrote it I had in mind the phrase "wacky ...

2025-12-25T01:58:58Z

In reply to nevent1q…8f7v
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fwiw When I wrote it I had in mind the phrase "wacky tabacky" that I was riffing on.

It's entirely possible I don't know how to pronounce the snack brand "takis". In my dialect (US great plains/midwest, and very very white) I'm hearing "wacky tackies".

Hi! A couple of thoughts from someone who is fascinated with ...

2025-12-25T01:18:04Z

In reply to nevent1q…q52j
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Hi! A couple of thoughts from someone who is fascinated with musical tuning but in a fairly superficial way.

First, in looking at the hexagonal grid pages about 2/3 of the way through I wondered: You touch on scales with more than 12 tones, but only in the guise of equal temperament (29-TET). Would it be possible instead to develop a family of "just" intonations with 29 tones? Would it be described by a similar kind of grid, just with more elements, or would the shape be different?

Second, I went looking in OEIS for the list of "best approximation to 3/2" and found https://oeis.org/search?q=5%2c7%2c12%2c29%20id:A060528 -- but it goes 1,2,**3**,5,7,12,29,... and I can't figure out what difference between the two statements of the problem leads to 3 being/not being on the frontier of best approximations.

Finally, just an observation: It's unusual to see a discussion of tuning without an appeal to the overtone series somewhere. I assume this was a conscious decision.

wacky takis

2025-12-24T23:30:37Z

In reply to nevent1q…p87p
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wacky takis

I know this is a weird request but if you know of any ...

2025-12-15T14:39:40Z

I know this is a weird request but if you know of any queer-themed barbershop songs that I can buy sheet music to, please send them my way in the next 24 hours

#vocalMusic #barbershopQuartet #TTBB #queer #lazyFedi

I've tried & failed to write a commandline program to ...

2025-11-24T16:01:58Z

In reply to nevent1q…wkh7
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I've tried & failed to write a commandline program to upload to a codeberg repo via the /contents/ API... I just get a "500" response. And I've failed to find any examples of anyone else doing this. If I could just upload to a public repo without bothering with having a git repo locally that gets me most of what I would want from a gist replacement except possibly embedding. but it just doesn't quite work...

Hey, what are we using as a replacement for github's gist ...

2025-11-24T14:41:22Z

Hey, what are we using as a replacement for github's gist functionality? Ideally it'd be something long lived with embed functionality. History, multiple files & comments are less important to me.

#lazyweb #lazyfedi

Aurora photos from last night. Near Wildwood Lake State Wildlife ...

2025-11-12T14:55:56Z

Aurora photos from last night. Near Wildwood Lake State Wildlife Management Area north of Lincoln Nebraska.

#LNK #Aurora #auroraBorealis #northernLights

I had a brain idea so I made a picture of it. #pride ...

2025-10-24T02:21:11Z

I had a brain idea so I made a picture of it. #pride

a stl file without a photo of it printed should be ineligible for ...

2025-10-23T13:04:29Z

In reply to nevent1q…vcsl
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a stl file without a photo of it printed should be ineligible for such a contest.

Now you can witness one of the first quickdraw calls from ...

2025-07-06T12:38:58Z

In reply to nevent1q…wsup
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Now you can witness one of the first quickdraw calls from MicroPython on mac... 🎉 ⬛

#micropython #python #retrocomputing #retro68 #macintosh #m68k

asyncio is working on mac micropython! also (not shown here) the ...

2025-07-03T10:33:27Z

In reply to nevent1q…wljn
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asyncio is working on mac micropython!

also (not shown here) the "sys.stdin" object is pollable, and you can double-click a python file to run it as the main code file.

#micropython
#python
#retrocomputing
#retro68
#macintosh
#m68k

Are there any folks with vintage Mac programming experience ...

2025-07-01T07:37:26Z

In reply to nevent1q…qput
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Are there any folks with vintage Mac programming experience who'd like to collaborate on figuring out what's next with Micropython on Mac?

I think that might be: What's the minimal set of APIs to do a fun graphical demo.

Pointers to "how to"-ish documentation in Pascal and C would be great as well, I have failed at finding this kind of stuff. (I do have Inside Macintosh but it is not a great tutorial)

#micropython
#python
#retrocomputing
#retro68
#macintosh
#m68k

oh my yay, it now works well enough to save and edit a file, then ...

2025-06-30T20:09:30Z

In reply to nevent1q…zskf
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oh my yay, it now works well enough to save and edit a file, then import and run that file.

you could basically use an old m68k mac as a python3 (well, micropython) development system now.

don't mind the debug messages, they're as scared of you as you are of them.

#micropython #python #retrocomputing #retro68 #macintosh #m68k

yup. putting in a nasty hack so that pointers can be found at ...

2025-06-30T20:03:55Z

In reply to nevent1q…fdfy
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yup. putting in a nasty hack so that pointers can be found at multiple-of-2 addresses makes it work a LOT better.

I thought I had m68k GC collection working, but I don't. ...

2025-06-30T19:20:17Z

In reply to nevent1q…stlm
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I thought I had m68k GC collection working, but I don't.

There may be multiple problems. I'm worried about one possible problem though: micropython assumes pointer types are sizeof(pointer) aligned, but I'm not sure that's the case on m68k macs. and indeed the compiler tells me alignof void* is 2. When it comes to the content of the stack, this may be trouble.

Whee! Now we can import files from the filesystem, as well as ...

2025-06-29T18:48:25Z

In reply to nevent1q…pxa4
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Whee! Now we can import files from the filesystem, as well as reading and writing files. Still haven't wrapped my head around how folders work, still can't enumerate files ..

as usual, work pushed to my micropython fork on github (which is called circuitpython, because you can't have two different forks of the "same" original project, argh).

#micropython #python #retrocomputing #retro68 #macintosh #m68k

I hope to use adafruit_editor (simplistic python full-screen ...

2025-06-28T10:15:24Z

In reply to nevent1q…n958
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I hope to use adafruit_editor (simplistic python full-screen editor) as the editor for .py files.

https://github.com/adafruit/Adafruit_Learning_System_Guides/tree/main/CircuitPython_Text_Editor/adafruit_editor

OK, well, it was much easier to hack out part of RetroConsole ...

2025-06-28T10:13:04Z

In reply to nevent1q…2zl2
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OK, well, it was much easier to hack out part of RetroConsole that was pulling in locale-sensitive routines. Now a "full features" build is under 400kB on disk and uses about 1MB when first opened (with a 100kB heap)

Next task is filesystem I/O I guess?

ugh, Unicode support? micropython is utf8 only, while mac has its own pre-standardization encoding I suppose. (yup: https://en.wikipedia.org/wiki/Mac_OS_Roman)

Trying to be excited about the opportunity to write my own ...

2025-06-28T08:55:02Z

In reply to nevent1q…n99j
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Trying to be excited about the opportunity to write my own terminal emulator for m68k mac... and failing.

"retro console" pulls in a substantal amount of code, ...

2025-06-27T18:19:47Z

In reply to nevent1q…vkt5
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"retro console" pulls in a substantal amount of code, maybe from libstdc++?

Oh hi, I'm std::time_get<wchar_t, std::istreambuf_iterator<wchar_t, std::char_traits<wchar_t> > >::_M_extract_via_format(std::istreambuf_iterator<wchar_t, std::char_traits<wchar_t> >, std::istreambuf_iterator<wchar_t, std::char_traits<wchar_t> >, std::ios_base&, std::_Ios_Iostate&, tm*, wchar_t const*, std::__time_get_state&) const and I'm adding 4.5kB to your program and so are each of 100 of my closest friends.

the basic 'hello world' produces a ~750kB file when the ...

2025-06-27T17:53:06Z

In reply to nevent1q…cqtc
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the basic 'hello world' produces a ~750kB file when the main object file is just 872 bytes. The "retro console" object files are only about 32kB., so I guess it's coming from retro68 including a lot of stuff as "standard library". Is it supposed to be that chonky? Can it ... not ?<code> 740 -rw-r--r-- 1 jepler jepler 755712 Jun 25 18:04 HelloWorld.code.bin </code>

It looks like the failure to start under system7 is just an ...

2025-06-27T17:42:20Z

In reply to nevent1q…xp62
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It looks like the failure to start under system7 is just an artifact of a too-big executable file, caused by enabling micropython language & stdlib features willy nilly. Which prompts the question: why is the executable file already around 1MB !?

Darn, I think all the easy parts of the micropython mac m68k port ...

2025-06-27T16:23:09Z

In reply to nevent1q…3ctd
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Darn, I think all the easy parts of the micropython mac m68k port are done.

unfortunately, vfs_posix doesn't seem to be a good fit. I did manage to create a "file" but couldn't actually write data to it.

And while it was working in system6 I just tried it again with system7 and it's failing to start at all. boo.

https://github.com/jepler/circuitpython/blob/ports-m68kmac/ports/m68kmac/README.md#key-todos

#umac #micropython #retro68 #macintosh #retrocomputing

Build updated at ...

2025-06-26T13:18:09Z

In reply to nevent1q…zts3
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Build updated at https://emergent.unpythonic.net/files/sandbox/micropython.dsk

Almost all of the "full features" support level of micropython are enabled, "mpz" for long integers and "float" for floating point numbers.

Backspace works in the repl. arrow keys don't.

A TODO section in the new README lists key items to work on:<li>Correctly implement GC collection (stack + registers)</li><li>Add Mac API support (e.g., quickdraw, arbitrary traps)</li><li>Support larger heap</li><li>Address GPL files (RetroConsole), GitHub Actions CI, and other issues that might prevent upstream inclusion.</li>

#umac #micropython #retro68 #macintosh #retrocomputing

Micropython on m68k mac? why not! It's reached the point of ...

2025-06-25T18:48:20Z

Micropython on m68k mac? why not! It's reached the point of sorta working.

#umac #micropython #retro68 #macintosh #retrocomputing

Yayay! today my PR to build #microPython with gcc's ...

2025-06-16T14:54:37Z

Yayay! today my PR to build #microPython with gcc's "undefined behavior" sanitizer landed (which also means micropython is free of detected undefined behavior problems! (except for one class of warning we deliberately silenced))

I've only been working towards this goal on and off since .. geez, 2018. This is one of the earliest PRs I opened against micropython: https://github.com/micropython/micropython/pull/3799

I hope the "address sanitizer" will follow soon; I'm working on it now. One of the newer checks (stack_use_after_return) will have to be disabled because it interferes with assumptions micropython makes about how C program stacks work, but even so!

From the arxiv paper: > The orbit of 2017 OF201 also presents ...

2025-05-23T08:51:48Z

In reply to nevent1q…jvm5
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From the arxiv paper:

> The orbit of 2017 OF201 also presents an intriguing challenge to the Planet X / Planet 9 hypothesis. Previous discoveries of TNOs with extremely wide and elongated orbits suggest an apparent clustering in the longitude of perihelia ϖ≈60∘, motivating the idea that an undetected planet may be shepherding the extreme TNOs. However, with ϖ = 306∘, the orbit of 2017 OF201 is an outlier of that clustering (Figure 2) and likely unstable to gravitational influence from this hypothesized planet. Our N-body simulations suggest that the presence of the Planet X / Planet 9 that produces the clustering will cause ejection of 2017 OF201 in a short timescale around 0.1 Gyr (Figure 4). Nevertheless, more investigation is required to decisively rule out that hypothesis.

more pico-mac stuffs on adafruit fruit jam with rp2350 left: ...

2025-03-18T02:18:39Z

more pico-mac stuffs on adafruit fruit jam with rp2350

left: 512x342 resolution on 640x480 framebuffer with hstx

right: 4MB mac emulated with psram (video reversed "because of reasons")

sadly, placing the main mac RAM in psram slows emulation down considerably. I haven't tried overclocking anything yet, that's for later.

#raspberrypi #rp2350 #picomac #marchintosh #retrocomputing

looks like TE AMPLIMITE .050 series. ...

2025-01-24T20:50:24Z

In reply to nevent1q…ur5z
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looks like TE AMPLIMITE .050 series.

https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/6-5173277-6/2203215 down to the square holes

mating part: https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/5174684-6/2202989

there are also maybe idc cable versions? https://www.te.com/en/product-CAT-AM7-2250.datasheet.pdf

fwiw my (rigol) scope's logic probe attachment has a connector similar to this.

hey @npub1vv8…6fhk I know you want to be respectful of my ...

2024-12-29T02:14:22Z

hey Python Software Foundation (npub1vv8…6fhk) I know you want to be respectful of my mailbox .. but the checkbox here seems to have gone missing -- I'm at https://psfmember.org/civicrm/contribute/transact/?reset=1&id=45 and it affects firefox 133.0.3 on Linux & chromium 131.0.6778.108 on Linux; firefox 133.0.3 on android & chrome 131.0.6778.200 on android.

thanks in anticipation of a fix!

does some feature in the current stop the decoupling layer from ...

2024-12-16T14:06:43Z

In reply to nevent1q…yhht
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does some feature in the current stop the decoupling layer from sliding around in X and Y as the next layer prints on top of it? or are you relying on friction to hold it there?

What happens when you die? Atheist: I decay Agnostic: IDK

2024-11-15T03:38:48Z

What happens when you die?

Atheist: I decay
Agnostic: IDK

In the video during the launch of #NASA #EuropaClipper you could ...

2024-10-14T16:48:05Z

In the video during the launch of #NASA #EuropaClipper you could see a silvery material wrapped around the rocket. The material wasn't still but moved around. Sometimes it seemed rhythmic, other times it looked like it was wind-blown. What's going on here and why did it look like that?

look honestly I'd pay good money to be "haunted" by ...

2024-09-20T12:53:49Z

In reply to nevent1q…pzu2
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look honestly I'd pay good money to be "haunted" by such a person for 24 hours. But it won't happen, "we've always done it this way".

My dear friend Binah is lead plantiff in a lawsuit against Aetna ...

2024-09-13T22:10:21Z

My dear friend Binah is lead plantiff in a lawsuit against Aetna for denying her gender affirming facial surgery mandated under the ACA. The lawsuit, filed this week, seeks class action status.

Press release: https://www.cohenmilstein.com/advocates-for-trans-equality-files-class-action-against-aetna-for-denying-gender-affirming-facial-surgeries/

News coverage: https://www.axios.com/2024/09/11/aetnas-denial-of-gender-affirming-care-taken-to-court

I don't understand the details, but if you've been affected by Aetna's denial of health care for FFS you may be able to join the lawsuit (there's a contact form on the law firm's page https://www.cohenmilstein.com/case-study/aetna-gender-affirming-surgery-facial-litigation/)

Please boost! 🔁

#transgender #ffs #facialFemininization #facialFeminizationSurgery #lawsuit #classAction #aetna #fuckAetna #aca #obamaCare