Magnetic Core memory was the RAM at the heart of many computer systems through the 1970s, and is undergoing something of a resurgence today since it is easiest form of memory for an enterprising hacker to DIY. [Han] has anexcellent writeup that goes deep in the best-practices of how to wire up core memory, that pairs with his512-bit MagneticCoreMemoryController on GitHub.

Magnetic core memory works by storing data inside the magnetic flux of a ferrite ‘core’. Magnetize it in one direction, you have a 1; the other is a 0. Sensing is current-based, and erases the existing value, requiring a read-rewrite circuit. You want the gory details? Check out [Han]’s writeup; he explains it better than we can, complete with how to wire the ferrites and oscilloscope traces to explain why you want to wiring them that way. It may be the most complete design brief to be written about magnetic core memory to be written this decade.

This little memory pack [Han] built with this information is rock-solid: it ran for 24 hours straight, undergoing multiple continuous memory tests — a total of several gigabytes of information, with zero errors. That was always the strength of ferrite memory, though, along with the fact you can lose power and keep your data. In in the retrocomputer world, 512 bits doesn’t seem like much, but it’s enough to play with. We’ve even featured smaller magnetic core modules, likethe Core 64. (No prize if you guess how many bits that is.) One could be excused for considering them toys; in the old days,you’d have had cabinets full of these sorts of hand-wound memory cards.

Magnetic core memory should not be confused withcore-rope memory, which was a ROM solution of similar vintage. The legendaryApollo Guidance Computer used both.

We’d love to see a hack that makes real use of these pre-modern memory modality– if you know of one, send in a tip.

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Recently AI risk and benefit evaluation company METR ran a randomized control test (RCT) on a gaggle of experienced open source developers to gain objective data on how the use of LLMs affects their productivity. Their findings were that using LLM-based tools like Cursor Pro with Claude 3.5/3.7 Sonnet reduced productivity by about 19%, with the full study by [Joel Becker] et al. available as PDF.

This study was also intended to establish a methodology to assess the impact from introducing LLM-based tools in software development. In the RCT, 16 experienced open source software developers were given 246 tasks, after which their effective performance was evaluated.

A large focus of the methodology was on creating realistic scenarios instead of using canned benchmarks. This included adding features to code, bug fixes and refactoring, much as they would do in the work on their respective open source projects. The observed increase in the time it took to complete tasks with the LLM’s assistance was found to be likely due to a range of factors, including over-optimism about the LLM tool capabilities, LLMs interfering with existing knowledge on the codebase, poor LLM performance on large codebases, low reliability of the generated code and the LLM doing very poorly on using tactic knowledge and context.

Although METR suggests that this poor showing may improve over time, it seems fair to argue whether LLM coding tools are at all a useful coding partner.

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Who doesn’t want an X-ray machine? But you need a special tube and super high voltage, right? [Project 326] says no, and produces a USB-powered device that uses a tube you can pick up two for a dollar. You might guess the machine doesn’t generate X-rays with a lot of energy, and you’d be right. But you can make up for it with long exposure times. Check out the video below, with host [Posh Arthur].

The video admits there are limitations, of course. We were somewhat sad that [Project 326] elected not to share the exact parts list and 3D printed files because in the unlikely event someone managed to hurt themselves with it, there could be a hysterical reaction. We agreed, though, that if you are smart enough to handle this, you’ll be smart enough to figure out how to duplicate it — it doesn’t look that hard, and there are plenty of not-so-subtle clues in the video.

The video points out that you can buy used X-ray tube for about $100, but then you need a 70kV power supply. A 1Z11 tube diode has the same basic internal structure, but isn’t optimized for the purpose. But it does emit X-rays as a natural byproduct of its operation, especially with filament voltage.

The high voltage supply needs to supply at least 1mA at about 20 kV. Part of the problem is that with low X-ray emission, you’ll need long exposure times and, thus, a power supply needs to be able to operate for an extended period. We wondered if you could reduce the duty cycle, which might make the exposure time even longer, but should be easier on the power supply.

The device features a wired remote, allowing for a slight distance between the user and the hot tube. USB power is supplied through a USB-C PD device, which provides a higher voltage. In this case, the project utilizes 20V, which is distributed to two DC-DC converters: one to supply the high-voltage anode and another to drive the filament.

To get the image, he’s using self-developing X-ray film made for dental use. It is relatively sensitive and inexpensive (about a dollar a shot). There are also some lead blocks to reduce stray X-ray emission. Many commercial machines are completely enclosed and we think you could do that with this one, if you wanted to.

You need something that will lie flat on the film. How long did it take? A leaf image needed a 50-minute exposure. Some small ICs took 16 hours! Good thing the film is cheap because you have to experiment to get the exposure correct.

This really makes us want to puzzle out the design and build one, too. If you do, please be careful. This project has a lot to not recommend it: high voltage, X-rays, and lead. If you laugh at danger and want a proper machine, you can build one of those, too.

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Dear Friend of Press Freedom,

It’s the 107th day that Rümeysa Öztürk is facing deportation by the United States government for writing an op-ed it didn’t like, and the 27th day that Mario Guevara has spent behind bars for covering a protest. Read on for news on more recent affronts by the government on the free press.

LA journalists reflect on protest attacks

Journalists covering recent demonstrations in California have been assaulted, detained, shot with crowd-control munitions, and had their equipment searched — simply for doing their jobs.

Independent journalists from Los Angeles talk to FPF about the attacks from law enforcement they endured while covering recent demonstrations.

Screenshot.

Independent reporters are especially vulnerable. We hosted an online discussion with some of them — Ben Camacho, Sean Beckner-Carmitchel and Tina-Desiree Berg — to hear their firsthand accounts of their efforts to uphold the public’s right to know. We were also joined by Adam Rose, press rights chair at the Los Angeles Press Club, which, along with others, has sued law enforcement agencies for violating freedom of the press at the recent protests. Since our discussion, the judge in one of those lawsuits has ordered the Los Angeles Police Department to stop violating the First Amendment rights of journalists covering protests.

Listen to the conversation here.

New Jersey prosecutors ignore Constitution

Prosecutors are pursuing blatantly unconstitutional criminal charges against two Red Bank, New Jersey, journalists for declining to remove a police blotter entry about an arrest from a news website after the arrest was expunged, as FPF’s U.S. Press Freedom Tracker first reported.

They’re alleged to have engaged in disorderly conduct by revealing the existence of an arrest, knowing that the arrest record has been expunged or sealed, in violation of New Jersey Revised Statutes Section 2C:52-30.

We said in a press release that “prosecuting journalists for declining to censor themselves is alarming and blatantly unconstitutional … Any prosecutors who would even think to bring such charges either don’t know the first thing about the Constitution they’re sworn to uphold, or don’t care.” Read more here.

The rise and fall of FOIA Gras

Tom Hayden never intended to become a journalist. But in the midst of the COVID-19 pandemic, Hayden decided to look into how his local school district in Evanston, Illinois, was making decisions about when to send kids back to school.

That led to his Substack newsletter, FOIA Gras. As the name implies, it focused on Freedom of Information Act-based reporting. He broke important stories about local schools and more, and FOIA Gras became an invaluable resource for Evanstonians.

But earlier this year, he decided to shut it down after growing tired of the personal toll of being an unpaid citizen journalist covering politically charged news. Read more here.

Secrecy surrounds ICE’s for-profit detention network

President Donald Trump’s signature budget legislation allocates Immigration and Customs Enforcement a staggering $45 billion to expand immigrant detention efforts. Much of this money will go towards tripling ICE’s for-profit detention facility network.

Even though these private facilities hold human beings in federal custody under federal law, they are not subject to FOIA, the federal transparency law. This must change. Read more here.

Speaking of secret police…

Louisiana is the latest state to ignore the First Amendment to restrict journalists and others from recording police up close. Countless important news stories have come from footage of police abuses — which is exactly why we keep seeing laws like these.

We joined a legal brief led by the Foundation for Individual Rights and Expression and National Press Photographers Association. If you’re able, NPPA is definitely an organization you should support. They do an incredible job protecting the rights of photojournalists and all journalists, but they’re in financial trouble and need your help. Read the brief here.

What we’re reading

SPJ urges caution on anti-doxing laws, warns of threat to press freedom (Society of Professional Journalists). Anti-doxing laws, if not drafted carefully, could become tools to punish journalism. Read the letter we signed urging the Uniform Law Commission to pause potential legislation.

‘I am being persecuted’ | Atlanta journalist held in ICE custody releases letter (WALB News). “I am being persecuted for having carried out my journalistic work ... I need to get out in order to continue with my life, return to my work, and support my family,” wrote imprisoned journalist Mario Guevara.

Immigration officials used shadowy pro-Israel group to target student activists (The New York Times). Students exercising their First Amendment rights shouldn’t concern the government. And officials should base decisions on real intelligence, not “research” by amateur internet trolls.

Trump officials want to prosecute over the ICEBlock app. Lawyers say that’s unconstitutional (Wired). “ICE and the Trump administration are under the misimpression that law enforcement in the United States is entitled to operate in secret,” we told Wired.

I chaired the FCC. The ‘60 Minutes’ settlement shows Trump has weaponized the agency (The Guardian). “What was once an independent, policy-based agency is now using its leverage to further the Maga message,” writes former Federal Communications Commission Chair Tom Wheeler.

Gabbard’s team has sought spy agency data to enforce Trump’s agenda (The Washington Post). This retaliation could chill FOIA releases across the government. We are filing FOIA requests to learn how Gabbard’s agency is trying to stifle lawful disclosures.

Wishing for a world where corporate motives didn’t clash with the sacred trust of journalism (Poynter). “The ethics of the professional and the business can bump into each other. When they do, it is imperative that the ethics of the profession take precedence.”

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Building a simple 8-bit computer is a great way to understand computing fundamentals, but there’s only so much you can learn by building a system around an existing processor. If you want to learn more, you’ll have to go further and build the CPU yourself, as [MINT] demonstrated with his EPROMINT project (video in Polish, but with English subtitles).

The CPU began when [MINT] began experimenting with uses for his collection of old memory chips, and quickly realized that they could do quite a bit more than store data. After building a development board for single-chip based programmable logic, he decided to build a full CPU out of (E)EPROMs. The resulting circuit spans four large pieces of perfboard, weighs in at over half a kilogram, and took several weeks of soldering to create.

The star of the system is the ALU, which runs an instruction set inspired by the Z80, but with some optimizations and added features. In particular, it has new operations for multiplication, division, bitstream operations, more advanced bit shifting, and a wide range of mathematical functions, including exponents, roots, and trigonometric functions. [MINT] documented all of this in a nicely-formatted offline booklet, available under the project’s GitHub repository. It’s currently only possible to program for the CPU using opcodes or a custom flavor of assembly, but there are plans to write a C compiler for it.

Even without being able to write in a higher-level language than assembly, [MINT] was able to drive a VFD screen with the EPROMINT, which he used to display some clips from The Matrix. This provided an opportunity to demonstrate basic debugging methods, which involved dumping and analyzing the memory contents after a failed program execution.

Using memory chips as programmable logic gates is an interesting hack, and we’ve seen Lisp programs written to make this easier. Of course, this isn’t the first CPU we’ve seen built without any chips intended for logic operations.

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Thanks to [Piotr] for the tip!

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FOR IMMEDIATE RELEASE:

Prosecutors are pursuing baseless criminal charges against two Red Bank, New Jersey, journalists for refusing to remove a police blotter entry from a news website, as the Freedom of the Press Foundation’s U.S. Press Freedom Tracker first reported.

The defendants are Redbankgreen publisher Kenny Katzgrau and reporter Brian Donohue. They’re alleged to have engaged in disorderly conduct by revealing the existence of an arrest, knowing that the arrest record has been expunged or sealed, in violation of New Jersey Revised Statutes Section 2C:52-30. They’re represented by Pashman Stein Walder Hayden P.C., who have moved to dismiss the ridiculous charges. (Read their motion to dismiss below.)

On Sept. 18, 2024, Redbankgreen published the August 2024 blotter provided by the Red Bank Police Department, which contained information about the arrest. The arrest was later expunged on March 27, 2025. The blotter published by the Redbankgreen includes an update that the arrest was expunged, as well as a note that arrests in general are not determinations of guilt.

Freedom of the Press Foundation (FPF) Advocacy Director Seth Stern said:

Prosecuting journalists for declining to censor themselves is alarming and blatantly unconstitutional, as is ordering the press to unpublish news reports. Any prosecutors who would even think to bring such charges either don’t know the first thing about the Constitution they’re sworn to uphold, or don’t care. Failure to immediately correct and apologize for this inexplicable error would put prosecutors’ competence in doubt and warrant investigation of whether they should keep their law licenses.

The Supreme Court has held over and over that journalists are entitled to publish truthful information they lawfully obtain, in cases dealing with matters as sensitive as closed juvenile court proceedings and identities of rape victims. The Supreme Court of New Jersey has also upheld the right to publish expunged information. There is no exception for expunged arrest records and any state law that says otherwise violates the First Amendment. Any first-year law student should know that.

Journalists don’t work for the government and can’t be compelled to do its bidding. In the rare instances where the government is allowed to keep records from public view, it is the government’s responsibility, not the media’s, to ensure that they aren’t disclosed.

This is the latest in a string of egregious press freedom violations by local police and prosecutors across the country. Virtually all of them have failed and left taxpayers on the hook for needless legal fees, settlement payments, or both.

Earlier this year, Clarksdale, Mississippi, officials got a judge to order a newspaper to take down an editorial critical of the mayor. After national headlines about their frivolous antics led to public ridicule, they dropped the case.

Last year, the city of Los Angeles was forced to pay a settlement to journalist Ben Camacho after it sued him for publishing public records. Authorities in LA are also facing a lawsuit over an unconstitutional investigation of a journalist who obtained police disciplinary records.

In 2023, prosecutors in Atmore, Alabama, charged a journalist and news publisher for reporting on grand jury proceedings. The case was thrown out after becoming a national embarrassment, and a lawsuit is pending.

And most famously, the same year, authorities in Marion, Kansas, raided the newsroom of the Marion County Record as part of an investigation premised on the absurd notion that reporters violated computer crime laws by accessing a public website to confirm a news tip. The ordeal has led to multiple settlements and lawsuits, and even criminal charges against the ex-police chief who orchestrated it.

This is also, unfortunately, not the first recent instance of authorities harassing journalists over lawful reporting on arrests. Last year, San Francisco City Attorney David Chiu threatened civil penalties against a journalist, Jack Poulson, who reported on a sealed report of tech executive Maury Blackman’s arrest for domestic violence. A judge held that the California law that Chiu referenced to threaten Poulson was unconstitutional and, in a separate proceeding, a lawsuit brought by Blackman against Poulson was dismissed.

Please contact us if you would like further comment.

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Sixteen Israeli experts in international law warned in a public letter that the plans presented by Israel's defense minister to concentrate Gaza's population in a "humanitarian city" constitute a manifestly illegal order and a war crime.

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Over on YouTube, [Technology Connections] has a new video: Induction lamps: fluorescent lighting’s final form.

This video is about a wireless fluorescent light which uses induction to transfer power from the electrical system into the lamp. As this lamp doesn’t require wiring it is not prone to “sputtering” as typical fluorescent lights are, thus improving the working life by an order of magnitude. As explained in the video sputtering is the process where the electrodes in a typical fluorescent lamp lose their material over time until they lose their ability to emit electrons at all.

This particular lamp has a power rating of 200 W and light output of 16,000 lumens, which is quite good. But the truly remarkable thing about this type of lighting is its service life. As the lamp is simply a phosphor-coated tube filled with argon gas and a pellet of mercury amalgam it has a theoretically unlimited lifespan. Or let’s call it 23 years.

Given that the service life is so good, why don’t we see induction lamps everywhere? The answer is that the electronics to support them are very expensive, and these days LED lighting has trounced every lighting technology that we’ve ever made in terms of energy efficiency, quality of light, and so on. So induction lamps are obsolete before they ever had their day. Still pretty interesting technology though!

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Thanks to [Keith Olson] for writing in about this one.

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Testo preparato con Peppe Brescia

Grazie a un’inaspettata nota divulgata il 9 Luglio, l’istituto Superiore di Sanità (Iss) ha annunciato l’avvio della prima sperimentazione italiana sugli utilizzi medici della psilocibina, il principio attivo dei cosiddetti funghi magici nell’ambito della cura di patologie depressive resistenti ai trattamenti tradizionali. Lo studio, che ha ultimato la fase di test preclinici, ha ricevuto l’autorizzazione da parte dell’Agenzia Italiana per i Farmaci (Aifa).

La ricerca verrà sviluppata in modalità multicentrica, mediante una collaborazione tra la Clinica Psichiatrica dell’Ospedale di Chieti, il Dipartimento di Neuroscienze, Imaging e Scienze Cliniche dell’Università “Gabriele D’Annunzio” di Chieti, l’ASL Roma 5 e l’Azienda Ospedaliero-Universitaria “Ospedali Riuniti” di Foggia. L’Iss assumerà invece le funzioni di coordinamento dello studio.

Per il progetto, che prevede durata biennale, sono stati arruolati 68 pazienti affetti da depressione resistente che riceveranno somministrazioni di psilocibina in un ambiente controllato e supervisionato da personale clinico specializzato.

La valutazione dei risultati del trial, finalizzato alla definizione di nuovi modelli di approccio psichiatrico, sarà effettuata tramite il ricorso a tecniche di neuroimaging e neurofisiologia, propedeutici all’identificazione di biomarcatori cerebrali di rilievo.

L’annuncio dell’Iss è stato accolto con generale entusiasmo da parte dei professionisti del settore coinvolti nella sperimentazione. Secondo Giovanni Martinotti, Professore Ordinario di Psichiatria all’Università di Chieti, si tratta di “un cambio di paradigma più scientifico che culturale”, nonché di “una grande occasione per la ricerca italiana e per migliorare le cure per la salute mentale” utile a produrre conoscenze che “potranno rendere l’impiego delle nuove molecole ancora più sicuro, accettabile e accessibile per l’applicazione in ambito clinico”.

Anche Francesca Zoratto, ricercatrice dell’Iss e Principal Investigator del progetto, ha posto l’accento sulle inedite peculiarità dell’esperimento, sottolineando la possibilità di sondare “forme innovative, come quelle non psichedeliche che potrebbero mantenere il potenziale terapeutico eliminando gli effetti allucinogeni”.

La psilocibina, trasformata a livello metabolico in psilocina, svolge la propria azione sui recettori della serotonina mediante un’attività di riorganizzazione delle reti cerebrali responsabili di umore e percezioni.

Le potenzialità terapeutiche finora dimostrate dalla psilocibina hanno attirato interesse anche in ambito europeo, all’inizio del 2024 è infatti in corso PsyPal il primo progetto pan-europeo di studio psichedelico finanziato dalla Commissione europea che, tra le altre cose, valuterà l’idoneità della psilocibina nella gestione del disagio psicologico ed esistenziale derivante da quattro diverse patologie progressive: la broncopneumopatia cronica ostruttiva, la sclerosi multipla, la sclerosi laterale amiotrofica e i disturbi parkinsoniani avanzati e atipici.

Secondo i dati raccolti dall’Iss nel 2024, circa il 6% della popolazione italiana riferisce sintomi depressivi, riconducibili alla depressione maggiore nella metà dei casi.

Altre sono le condizioni per cui la ricerca scientifica o i trial clinici con gli psichedelici potrebbe dare risultati incoraggianti, per questo l’Associazione Luca Coscioni continua a portare avanti il suo impegno a favore della sperimentazione delle molecole allucinogene: nei mesi scorsi è stato lanciato L’Italia apra alle terapie psichedeliche, un appello in quattro punti indirizzato ai ministri Schillaci e Crosetto.

Le richieste prevedono la prescrivibilità degli psichedelici nell’ambito delle cure palliative e in quanto terapie compassionevoli, l’istituzione di un progetto pilota incentrato sullo studio della sindrome da stress post-traumatico del personale militare impiegato in missioni internazionali, infine un confronto istituzionale con una delegazione di esperti.

L’appello è al momento giunto a circa 15000 sottoscrizioni tra cittadini e operatori del settore. Il 27 settembre a La Spezia l’Associazione terrà un evento pre-congressuale dedicato agli psichedelici e continua a partecipare alla mobilitazione di Psychedelicare.eu l’iniziativa civica che chiede alla Commissione europea adeguati finanziamenti e un impegno internazionale per ritabellizzare gli psichedelici. L’iniziativa può essere sottoscritta qui.

L'articolo Al via la prima sperimentazione italiana con la psilocibina proviene da Associazione Luca Coscioni.