Ask HN: Resources for getting started with bare-metal coding?

Ask HN: Resources for getting started with bare-metal coding?

Several years ago I bought a used copy of the original x86 manual and wrote a proof-of-concept OS. Even back when I wrote my toy OS, the contemporary Intel manual was 10x the size of the original that I worked with. (If not, how is software keeping up with hardware advances?

Source: news.ycombinator.com

Hypersonic Missiles Are Unstoppable

Hypersonic Missiles Are Unstoppable

Several months later, he and Griffin created a new Space Development Agency of some 225 people, tasked with putting a network of sensors in low-earth orbit that would track incoming hypersonic missiles and direct American hypersonic attacks. Although hypersonic missiles can in theory carry nuclear warheads, those being developed by the United States will only be equipped with small conventional explosives. Hypersonic missiles are also ideal for waging a decapitation strike — assassinating a country’s top military or political officials.

Source: www.nytimes.com

Scientists have discovered a sea of fresh water under the ocean

Scientists have discovered a sea of fresh water under the ocean

“We knew there was fresh water down there in isolated places, but we did not know the extent or geometry,” said lead author Chloe Gustafson, a PhD candidate at Columbia University’s Lamont-Doherty Earth Observatory, according to Phys.org. al / Nature

Conceptual illustration of aquifers extending off the US Atlantic coast.The water is not pure terrestrial fresh water, which contains salt concentrations of less than one part per thousand. Near land, the undersea aquifer has concentrations close to pure fresh water.

Source: qz.com

US ‘launched cyber-attack on Iran weapons systems’

US ‘launched cyber-attack on Iran weapons systems’

Image copyright
EPA

Image caption

The attack targeted rocket and missile systems run by Iran’s Islamic Revolutionary Guard Corps

The US launched a cyber-attack on Iranian weapons systems on Thursday as President Trump pulled out of air strikes on the country, US reports say. It was in retaliation for the shooting down of a US drone as well as attacks on oil tankers that the US has blamed Iran for, the New York Times said. It was aimed at weapons systems used by Iran’s Islamic Revolutionary Guard Corps (IRGC), which shot down the US drone last Thursday and which the US says also attacked the tankers.

Source: www.bbc.co.uk

Arima Model – Complete Guide to Time Series Forecasting in Python

Arima Model – Complete Guide to Time Series Forecasting in Python

ARIMA, short for ‘Auto Regressive Integrated Moving Average’ is actually a class of models that ‘explains’ a given time series based on its own past values, that is, its own lags and the lagged forecast errors, so that equation can be used to forecast future values. An ARIMA model is characterized by 3 terms: p, d, q

p is the order of the AR term

q is the order of the MA term

d is the number of differencing required to make the time series stationary

If a time series, has seasonal patterns, then you need to add seasonal terms and it becomes SARIMA, short for ‘Seasonal ARIMA’. An ARIMA model is one where the time series was differenced at least once to make it stationary and you combine the AR and the MA terms.

Source: www.machinelearningplus.com

FedEx apologizes for not delivering Huawei phone, cites operational error

FedEx apologizes for not delivering Huawei phone, cites operational error

(Reuters) – FedEx Corp said an “operational error” caused a Huawei Technologies Co Ltd phone to not be delivered to the United States and the package delivery company apologized for the error, the Global Times reported on Sunday. “FedEx can accept and transport all Huawei products except for any shipments addressed to listed Huawei entities on the U.S. Entity List,” FedEx said in a statement cited by the newspaper. China launched an investigation into FedEx Corp earlier this month over parcels delivered to the wrong address, without giving details about the deliveries in question.

Source: www.reuters.com

The transformer “explained”?

The transformer “explained”?

The closest thing to an intuitive explainer than I know of is “The Illustrated Transformer,” but IMO it’s too light on intuition and too heavy on near-pseudocode (including stuff like “now you divide by 8,” as the third of six enumerated “steps” which themselves only cover part of the whole computation!) A sentence can have a pronoun at one end whose antecedent is all the way at the other, for example. But instead of looking at the current position plus a small local window around it, they instead look at

When the input is textual, this feels a lot like “reading” – the RNN processes the the first word, writes down a summary of what it’s gleaned so far, then processes the second word in light of the summary, updates the summary, processes the third word in light of the summary, updates the summary, etc.

Source: nostalgebraist.tumblr.com

Gary Burrell, Garmin co-founder, has died

Gary Burrell, Garmin co-founder, has died

Gary Burrell, who with a fellow engineer founded Garmin, the navigational device company whose products can direct pilots in fog, prevent hikers from getting lost and help insomniacs track their sleep, died on June 12 at his home in Spring Hill, Kan. His death was announced by the company, which is based in Olathe, Kan. Mr. Burrell (pronounced burr-ELL) was vice president of engineering for King Radio, an avionics company that made navigational devices, when he recruited Dr. Min H. Kao from Magnavox, another defense contractor.

Source: www.nytimes.com

For Sale: Free Operating System (1998)

For Sale: Free Operating System (1998)

URHAM, N.C. — In an experiment that is half business model and half populist movement, a small company called Red Hat Software is charging $50 for an operating system called Linux that anyone can get free on the Internet, and it is paying programmers decent wages to write code that it will give away. Such support, particularly from Intel, whose close ties to Microsoft have recently shown signs of fraying, would lend considerable credibility both to Linux and to Red Hat’s plans to build a business by providing customer service and technical support for the free operating system. That is why the emergence of companies like Red Hat and Caldera Systems Inc. — a Linux distributor with a business plan based on corporate training, services and support — is considered crucial to the success of the free operating system.

Source: archive.nytimes.com