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Writing an operating system kernel from scratch – RISC-V/OpenSBI/Zig

news.ycombinator.com Uros Popovic 2025-09-27 03:36:23

Posted on: September 13, 2025 | at 09:30 AM Follow @popovicu94 I recently implemented a minimal proof of concept time-sharing operating system kernel on RISC-V. In this post, I’ll share the details of how this prototype works. The target audience is anyone looking to understand low-level system software, drivers, system calls, etc., and I hope this will be especially useful to students of system software and computer architecture. This is a redo of an exercise I did for my undergraduate cours

Topics: interrupt kernel sp stack thread

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Robert Redford has died

news.ycombinator.com Brooks Barnes 2025-09-29 15:10:31

From time to time, people with similar political priorities encouraged him to run for office. He brushed such chatter aside, having become disillusioned with government in the late 1970s, when he was elected commissioner of the Provo Canyon sewer district. (He had sought the office in an effort to protect the Provo Canyon area near his home from development and pollution. But he quickly encountered bureaucracy, which reinforced his belief that independent activism and storytelling through film w

Topics: california later mr redford told

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Development of the MOS Technology 6502: A Historical Perspective (2022)

news.ycombinator.com Jason Sachs 2025-09-29 17:59:47

One ubiquitous microprocessor of the late 1970s and 1980s was the MOS Technology MCS 6502. I included a section on the development of the 6502 in Part 2 of Supply Chain Games, and have posted it as an excerpt here, as I believe it is deserving in its own right. (Note: MOS Technology is pronounced with the individual letters M-O-S “em oh ess”,[1] not “moss”, and should not be confused with another semiconductor company, Mostek.) Semiconductor Fabrication and the 6502 The 6502 was first deliver

Topics: 6502 design mensch mos motorola

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A new experimental Google app for Windows

news.ycombinator.com Vinay Mahagaokar 2025-09-29 18:05:46

Today, we’re launching a new experimental Google app for Windows in Labs to help you find what you need, faster. Now you can search without switching windows or interrupting your flow. Whether you're writing in a doc or in the middle of a game, just press Alt + Space to instantly search for information from your computer files, installed apps, Google Drive files — and of course, the web. With Google Lens built in, you can select and search anything on your screen, making it easy to translate i

Topics: ai google help labs search

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UTF-8 history (2003)

news.ycombinator.com Unknown 2025-09-26 11:56:00

The history of UTF-8 as told by Rob Pike Rob Pike explains how Ken Thompson invented UTF-8 in one evening and how they together built the first system-wide implementation in less than a week.

Topics: built history pike rob utf

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Launch HN: Rowboat (YC S24) – Open-source IDE for multi-agent systems

news.ycombinator.com Unknown 2025-09-29 20:01:16

Let AI build multi-agent workflows for you in minutes ⚡ Build AI agents instantly with natural language | 🔌 Connect tools with one-click integrations | 📂 Power with knowledge by adding documents for RAG | 🔄 Automate workflows by setting up triggers and actions | 🚀 Deploy anywhere via API or SDK ☁️ Prefer a hosted version? Use our cloud to starting building agents right away! Quick start Set your OpenAI key export OPENAI_API_KEY=your-openai-api-key Clone the repository and start Rowboat (re

Topics: assistant build rag rowboat tools

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Waymo has received our pilot permit allowing for commercial operations at SFO

news.ycombinator.com The Waymo Team 2025-09-29 19:38:08

All systems go at SFO! Waymo has received our pilot permit allowing for commercial operations at San Francisco International Airport. We’ll partner with SFO to prepare our operations at the airport in phases, beginning with employee testing soon ahead of welcoming Bay Area riders. Pickups and dropoffs will initially start at SFO’s Kiss & Fly area – a short AirTrain ride from the terminals – with the intention to explore other locations at the airport in the future. This is a major milestone th

Topics: airport francisco san sfo waymo

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Here’s How to Deflect a Dangerous Asteroid Without It Totally Backfiring

gizmodo.com Passant Rabie 2025-09-29 20:30:14

In September 2022, NASA deliberately crashed a spacecraft into an asteroid, successfully altering the space rock’s trajectory. The orbital shove demonstrated an asteroid deflection technique that could come in handy if a massive rock were headed in Earth’s direction. As it turns out, however, deflecting a potentially threatening asteroid is only half the battle. Striking an asteroid for deflection purposes could send it back on a collision course with Earth, merely delaying the planet-shatterin

Topics: asteroid earth impact rock trajectory

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The VPN Market Is Booming Because We're Working Remotely and Worried About Privacy

cnet.com See Full Bio 2025-09-29 20:12:36

We all have concerns about online safety and security, and that's not changing anytime soon. According to a new report from Maximum Market Research, the global market for virtual private networks will grow by more than 17% annually over the next five years. VPN expenditures are projected to reach $150 billion by 2030, more than triple what it was ($48.7 billion) in 2023. Two key drivers for that growth are the lack of data security on public networks and the increasing number of employees doin

Topics: 2030 data market vpn vpns

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OpenAI Is Building a Teen-Friendly Version of ChatGPT

cnet.com See Full Bio 2025-09-29 20:23:23

OpenAI announced today that it's developing a "different ChatGPT experience" tailored for teenagers, a move that underscores growing concerns about the impact of AI chatbots on young people's mental health. The new teen mode is part of a broader safety push by the company in the wake of a lawsuit by a family who alleged ChatGPT's lack of protections contributed to the death by suicide of their teenage son. The changes include age-prediction technology to keep kids under 18 out of the standard v

Topics: chatgpt emergency openai safety teen

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Tesla under investigation for door handles that trap people inside

theverge.com Andrew J. Hawkins 2025-09-29 20:12:21

is transportation editor with 10+ years of experience who covers EVs, public transportation, and aviation. His work has appeared in The New York Daily News and City & State. Posts from this author will be added to your daily email digest and your homepage feed. Tesla is under investigation for faulty electronic door handles that can trap people inside their vehicles. The National Highway Traffic Safety Administration (NHTSA) launched the probe, saying it was responding to numerous complaints

Topics: children door investigation tesla vehicle

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YouTube rolls out Studio updates, ‘likeness’ detection, lip synced dubs, creator collabs, and more

techcrunch.com Sarah Perez 2025-09-29 17:30:00

YouTube on Tuesday announced a suite of new features coming to YouTube Studio, the platform over 30 million creators use to manage their channels and track their analytics and revenue every month. At its Made on YouTube event, the company unveiled new and updated tools like an AI-powered chatbot for support, an inspiration tab, title A/B testing features, auto dubbing, likeness detection tools, and more. Many of these features build on tools previously announced or tested with smaller groups, b

Topics: creators feature image video youtube

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Waymo’s Tekedra Mawakana on Scaling Self-Driving Beyond the Hype

techcrunch.com Techcrunch Events 2025-09-29 20:35:00

Autonomous vehicles have long been touted as “just around the corner,” but the reality of bringing self-driving cars to the streets is far from simple. At TechCrunch Disrupt 2025 — October 27–29 at Moscone West in San Francisco — Waymo co-CEO Tekedra Mawakana joins the Disrupt Stage for a wide-ranging conversation on the true state of AVs and where the industry goes from here. Inside the self-driving reality check While headlines often highlight crashes, controversies, or overblown promises, M

Topics: autonomous disrupt headlines mawakana waymo

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Deal is done to keep TikTok in the US, says Trump

feeds.bbci.co.uk Unknown 2025-09-29 22:12:26

Deal is done to keep TikTok in the US, says Trump 3 hours ago Share Save Imran Rahman-Jones Technology reporter Share Save Getty Images A deal has been made between the US and China to keep TikTok running in the US, according to the US President Donald Trump. "We have a deal on TikTok, I've reached a deal with China, I'm going to speak to President Xi on Friday to confirm everything up," Trump told reporters as he left the White House for a state visit to the UK. The social media platform, wh

Topics: china deal said tiktok trump

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Trump's willingness to let TikTok 'go dark' motivated China to make deal, Bessent says

cnbc.com Chris Eudaily 2025-09-30 00:11:24

Treasury Secretary Scott Bessent said Tuesday that President Donald Trump was willing to let TikTok cease operating in the U.S., and that it was "what turned the tide" in the deal framework with China. "President Trump made it clear that he would have been willing to let Tiktok go dark, that we were not going to give up national security in favor of the deal," Bessent told CNBC's "Squawk Box." TikTok parent company ByteDance is still looking at a Sept. 17 deadline to divest the app's U.S. oper

Topics: bessent deal said tiktok trump

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Pope Slams Elon Musk for Obscene Greed

futurism.com Unknown 2025-09-29 23:16:50

In the months following the 2025 conclave that elected him, Pope Leo XIV warned that the astronomical and still widening gap between the rich and the poor means that "we're in big trouble." In remarks to Catholic newspaper Crux in July, which were published over the weekend, the Pope reflected on the "continuously wider gap between the income levels of the working class and the money that the wealthiest receive." "Yesterday [there was] the news that Elon Musk is going to be the first trilliona

Topics: gap income new pope years

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Google is finally changing its tune about call recording on Pixel phones

androidauthority.com Unknown 2025-09-30 00:43:58

C. Scott Brown / Android Authority TL;DR Google appears to be backing down from its long-standing position against letting Pixel phones record voice calls. The company has already updated support pages, indicating that the option may exist for Pixel 6 and later models. So far we’ve only seen confirmation out of India, and it’s unclear which markets will ultimately get access. Smartphones may do a million and one different things, but at their very core, these devices are still phones. You ma

Topics: calls google pixel recording support

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Can-Am Origin electric motorcycle review: Good for a fun time, not a long time

engadget.com Unknown 2025-09-30 00:00:00

It wasn't until your average electric car started managing 200 miles on a charge that the buying populace started getting over their range anxiety. That means electric motorcycles, with ranges often measured in double digits, remain a bit of a tough sell for mass-market buyers. The focus, then, seems to be "for a good time, not a long time," and that's very much the case of the Can-Am Origin. This $14,499 battery-powered dual-sport is a fun, flickable, go-anywhere two-wheeled smile factory that

Topics: advertisement blast don far origin

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The PS5 update that adds DualSense multi-device pairing rolls out soon

engadget.com Unknown 2025-09-30 00:52:12

Starting on Wednesday, it'll be much easier to switch between devices with your PlayStation controller. That's when the PS5 update Sony promised in July begins rolling out. Jumping between your console and, say, Windows will be as simple as pressing a button combo. Up to this point, you've had to unpair and repair your DualSense controller each time. After installing tomorrow's system update, it will only take a few steps to set up multi-device switching. With your DualSense controller powered

Topics: button controller device dualsense games

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Self-propagating supply chain attack hits 187 npm packages

bleepingcomputer.com Unknown 2025-09-30 00:46:43

Security researchers have identified at least 187 npm packages compromised in an ongoing supply chain attack, with a malicious self-propagating payload to infect other packages. The coordinated worm-style campaign dubbed 'Shai-Hulud' started yesterday with the compromise of the @ctrl/tinycolor npm package, which receives over 2 million weekly downloads. Since then, the campaign has expanded significantly and now includes packages published under CrowdStrike's npm namespace. From tinycolor to

Topics: attack chain compromised npm packages

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GNOME 49 arrives this week, and it's packed with features and polish you'll love

zdnet.com Jack Wallen 2025-09-30 00:05:51

Jack Wallen/ZDNET Follow ZDNET: Add us as a preferred source on Google. ZDNET's key takeaways GNOME 49 will be available on Sept. 17. The latest release switches out some default apps. This new GNOME adds just the right amount of polish. GNOME is a Linux desktop environment that you either love or hate. I've used GNOME and GNOME-based desktops for years and have always fallen on the side of "love. " With each new release, I always find a feature or two (or a bit of extra polish) that makes

Topics: 49 apps desktop gnome release

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Amazon Prime Day is October 7-8: Everything you need to know about October Prime Day

zdnet.com Kayla Solino 2025-09-30 00:20:00

It's September, which means fall seasonal sales and early holiday savings are on the horizon. Labor Day is in the rearview, but plenty of the most significant sales of the year will be creeping up soon, and Amazon's October Prime Day event (formally called Prime Big Deal Days) is one you can't miss. The retailer recently confirmed that the sale will return this year on Tuesday, Oct. 7, and Wednesday, Oct. 8. Also: 3 money-saving tricks I use every time I shop online - and you should too Amazon

Topics: amazon day october prime sale

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AirPods Pro 3 fitness feature surprises triathlete tester - here's what he found

zdnet.com Lance Whitney 2025-09-30 00:53:31

Zooey Liao/ZDNET/Apple Follow ZDNET: Add us as a preferred source on Google. ZDNET's key takeaways A known triathlete and blogger tried out the AirPods Pro 3. He tested the heart rate sensor while bicycling indoors and outdoors. The heart rate sensor got a thumbs up for its accuracy. Wondering if you should buy Apple's new AirPods Pro 3 for the health and fitness features alone? At least one expert is impressed by the accuracy of the heart rate sensor, which is new to the AirPods lineup.

Topics: airpods apple heart pro rate

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Mother of All Demos (1968)

news.ycombinator.com Unknown 2025-09-29 22:18:19

SUMMARY Douglas Engelbart's 1968 "Mother of All Demos" at SRI showcased interactive computing innovations, including the mouse debut, hypertext, real-time editing, and collaborative tools, envisioning augmented human intellect. STATEMENTS The Augmented Human Intellect Research Center at Stanford Research Institute has pursued computer systems that enhance intellectual work by providing instant responsiveness to user actions throughout the day. The demo features a computer mouse that controls

Topics: computer human information like shared

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1975 Sep 16 MOS Technology samples 6502 at WESCON, here's how they designed it

news.ycombinator.com Jason Sachs 2025-09-29 22:59:47

One ubiquitous microprocessor of the late 1970s and 1980s was the MOS Technology MCS 6502. I included a section on the development of the 6502 in Part 2 of Supply Chain Games, and have posted it as an excerpt here, as I believe it is deserving in its own right. (Note: MOS Technology is pronounced with the individual letters M-O-S “em oh ess”,[1] not “moss”, and should not be confused with another semiconductor company, Mostek.) Semiconductor Fabrication and the 6502 The 6502 was first deliver

Topics: 6502 design mensch mos motorola

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UTF-8 as told by Rob Pike

news.ycombinator.com Unknown 2025-09-26 16:56:00

The history of UTF-8 as told by Rob Pike Rob Pike explains how Ken Thompson invented UTF-8 in one evening and how they together built the first system-wide implementation in less than a week.

Topics: built history pike rob utf

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Plugin System

news.ycombinator.com Unknown 2025-09-30 00:10:44

With several lines of code, you can implement the exact feature tailored to your needs. Furthermore, with the Official User Scripts plugin, you can just copy-and-paste code snippets into IINA without writing plugin packages.

Topics: code copy exact furthermore plugin

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All Systems Go at SFO

news.ycombinator.com The Waymo Team 2025-09-30 00:38:08

All systems go at SFO! Waymo has received our pilot permit allowing for commercial operations at San Francisco International Airport. We’ll partner with SFO to prepare our operations at the airport in phases, beginning with employee testing soon ahead of welcoming Bay Area riders. Pickups and dropoffs will initially start at SFO’s Kiss & Fly area – a short AirTrain ride from the terminals – with the intention to explore other locations at the airport in the future. This is a major milestone th

Topics: airport francisco san sfo waymo

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Things you can do with a Software Defined Radio (2024)

news.ycombinator.com Unknown 2025-09-29 22:35:19

Fifty Things you can do with a Software Defined Radio 📻 Last week, I went on an adventure through the electromagnetic spectrum! It’s like an invisible world that always surrounds us, and allows us to do many amazing things: It’s how radio and TV are transmitted, it’s how we communicate using Wi-Fi or our phones. And there are many more things to discover there, from all over the world. In this post, I’ll show you fifty things you can find there – all you need is this simple USB dongle and an

Topics: frequency mhz radio receive things

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Scientists Gather to Confront the Doomsday Risks of ‘Mirror Life’

gizmodo.com Ellyn Lapointe 2025-09-30 00:10:48

The prospect of creating “mirror life”—synthetic cells made from molecules that are mirror images of those found in nature—remains completely hypothetical. Still, the potential consequences are so dire that experts from around the world are gathering to discuss how to prevent the worst-case scenario. This week, scientists, engineers, policymakers, and other stakeholders will convene in Manchester, U.K., for Engineering and Safeguarding Synthetic Life 2025. This annual international conference e

Topics: cells image life mirror scientists

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Latest Tech News

Writing an operating system kernel from scratch – RISC-V/OpenSBI/Zig

Robert Redford has died

Development of the MOS Technology 6502: A Historical Perspective (2022)

A new experimental Google app for Windows

UTF-8 history (2003)

Launch HN: Rowboat (YC S24) – Open-source IDE for multi-agent systems

Waymo has received our pilot permit allowing for commercial operations at SFO

Here’s How to Deflect a Dangerous Asteroid Without It Totally Backfiring

The VPN Market Is Booming Because We're Working Remotely and Worried About Privacy

OpenAI Is Building a Teen-Friendly Version of ChatGPT

Tesla under investigation for door handles that trap people inside

YouTube rolls out Studio updates, ‘likeness’ detection, lip synced dubs, creator collabs, and more

Waymo’s Tekedra Mawakana on Scaling Self-Driving Beyond the Hype

Deal is done to keep TikTok in the US, says Trump

Trump's willingness to let TikTok 'go dark' motivated China to make deal, Bessent says

Pope Slams Elon Musk for Obscene Greed

Google is finally changing its tune about call recording on Pixel phones

Can-Am Origin electric motorcycle review: Good for a fun time, not a long time

The PS5 update that adds DualSense multi-device pairing rolls out soon

Self-propagating supply chain attack hits 187 npm packages

GNOME 49 arrives this week, and it's packed with features and polish you'll love

Amazon Prime Day is October 7-8: Everything you need to know about October Prime Day

AirPods Pro 3 fitness feature surprises triathlete tester - here's what he found

Mother of All Demos (1968)

1975 Sep 16 MOS Technology samples 6502 at WESCON, here's how they designed it

UTF-8 as told by Rob Pike

Plugin System

All Systems Go at SFO

Things you can do with a Software Defined Radio (2024)

Scientists Gather to Confront the Doomsday Risks of ‘Mirror Life’

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