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This is the first post in our blog in 2019. And this is important for all of us: we are finally launching the English version of Habr! Actually it was ready in the middle of December, but — you know — releasing a new feature right before Christmas is like deploying on Friday afternoon. So we decided to do it in the beginning of 2019.

Probably, there are not so many users on Habr who have never heard about the «Internet Archive», a service that searches and stores the digital data that is important for all mankind, whether it be the Internet pages, books, videos or other type of information.

Who manages the Internet archive, when it appeared and what is its mission? Read about it in the today's «Inquiry».

We all hear of iconic movies, games, books or musical compositions that get vehemently praised by the community of sophisticados, professionals and critics, yet never seem to attract tangible commercial success or the attention of the wider audience. Such situations leave me deeply frustrated.

When it comes to development, good tech also sometimes never gets into the limelight. Take F# for example. All I know about it is that it is a super-cool, yet totally unpopular language which makes it hard for developers – upon getting to know it – to get back to the languages they’re used to.

I tried to find out what is the story behind this. In fact, who are the people who use it and why are they doing this if the language is out of demand in business? To find answers, I joined the Russian-speaking F# community on Telegram – our round table for the discussion.

Hi there, Habr!

Remember the story of Steve Jobs and Dennis Ritchie? Without any intention to rekindle the debates or moralize on the subject, let’s face the truth: thousands of stellar techies live in the shadow, while their own stories are hidden in a dusty cupboard.

We, the Habr editorial team, are keen to tackle this injustice. From now on, we will regularly interview people who keep a low profile in media and social networks. So if you have anything to tell about yourself, get ready.

To give you an idea of what this will look like, we will lead the way. Click below to see 10 general questions we will ask every guest. For our pilot episode, the first guest to answer the questions was fillpackart. (This month I’ve had several quite good interview sessions with him, see articles one, two, three). Please read them, and if you make up your mind on telling your own story in a similar way, just send me or baragol a message.

Author of the original post in Russian: frsamara

I always loved playing with things and testing them under all sorts of wacky conditions as a kid and even considered getting a job as a tester, but I never did. Nevertheless, I still like taking things made by someone else and poking them for vulnerabilities.

I remember, when first self-service payment terminals started popping around town, I saw one of them put up a browser window while updating, and the game was on — I broke it almost immediately. There’s been a lot of discussion about it since then and developers have started to pay a lot more attention towards security in these machines.

Recently, fast-food joints have started installing these terminals. Obviously, it’s quite convenient: just tap a couple of virtual buttons, place an order, pay with a bank card and wait for your number to show on the screen.

Also, nearly every big mall has these interactive boards with floor plans and information on various sales and discounts.

How secure are they?

Author of the original post in Russian: varanio

You may have read a recent article suggesting that vim is great unlike IDEs, because of their allegedly low typing speed.

Let’s recall that the main message of that article was that vim’s killer feature consists in its modes that sort of outshine everything else. That said, the author acknowledged that IntelliJ IDEA and other IDEs provide hotkeys and other user experience which can be easily used. However, since they lack modes, vim is supposed to be everyone’s first choice.

The author then suggests that instead of pressing ctrl+arrows to move between words, it is easier to press Esc, e and then go back to the i editing mode. Understandably, all this trouble because the author finds it inconvenient to hold ctrl.

I know that articles that criticize vim get many negative votes, but I just have to speak out.

Author of the original post in Russian: old_gamer



I'm a ragman. I have a closet full of old hardware. From Boolean logic microchips in DIP-cases to Voodoo5. Of course, there's no practical value in all of this, but some people enjoy messing with old hardware. If you are one of them, I invite you under the cut, where I will tell you how the computer based on AMD 286 processor worked with a modern network, and what came out of it.

Author of the original post in Russian: HotWaterMusic

The history of the world's gamedev knows quite a few curious bugs that had to be tackled by developers. In fact, judging from the story that Media Molecule's CTO Alex Evans shared on his Twitter page this past weekend, many legends are still waiting to be heard. Evans is famous for his part in a demoscene performance of late 1990s and his work on the LittleBigPlanet game series and on Rag Doll Kung Fu.

The case I am referring to in this article took place ten years ago, in 2008. While working on the first part of LittleBigPlanet — an original puzzle platform video game that was to be released exclusively for PlayStation 3 — the company's developers came across a really hard-to-catch bug.

Normally, for a game to get the green light to be released for consoles, it needs to pass a certification process, i.e. meet a set of requirements predefined by the platform owner. The certification may also include more specific requirements, such as the game running smoothly without crashing for 24 hours.

The development of LittleBigPlanet was at its last stage, with just two weeks to final deployment and distribution. Suddenly a tester from the company's QA in Japan reported that the game was consistently crashing when left overnight. Now the release was evidently out of question unless the bug was fixed.

Иногда молодые команды разработки охватывает неразбериха.

Это случается в тот момент, когда они ещё не до конца разобрались, что такое эджайл; проджект и продакт спорят, кто из них кто, а задачи каждый ведёт сам по себе. Или все уже всё знают, но планировать спринты не получается — задачи не прорабатываются, демо и ретро проходят нерегулярно.

У нас тоже была похожая история, но мы нашли свой путь.

Это рассказ от команды личного кабинета Яндекс.Кассы, и подробнейшая инструкция для тех, кто хочет улучшить своё планирование.

Как всё было

Introduction

Our project implements a real-time edge detection system based on capturing image frames from an OV7670 camera and streaming them to a VGA monitor after applying a grayscale filter and Sobel operator. Our design is built on a Cyclone IV FPGA board which enables us to optimize the performance using the powerful features of the low-level hardware and parallel computations which is important to meet the requirements of the real-time system.

We used ZEOWAA FPGA development board which is based on Cyclone IV (EP4CE6E22C8N). Also, we used Quartus Prime Lite Edition as a development environment and Verilog HDL as a programming language. In addition, we used the built-in VGA interface to drive the VGA monitor, and GPIO (General Pins for Input and Output) to connect the external hardware with our board.

Introduction

As first-year students of Innopolis University, we had an opportunity to make our own project in computer architecture. University suggested us several projects and we have chosen to make a stack-based calculator with reverse polish notation. One of the requirements for the project is to use FPGA board provided by the university.



As our board, we have chosen Cyclon IV. Therefore, we had to write code on hardware description language. In the course we have studied Verilog, so we have chosen it. Also, the university has additional modules for FPGA, such as numpad, thus we decided to use it in our project.

In this article, we want to share our knowledge about FPGA and Verilog, also provide you with a tutorial to repeat our project.

When you study an abstract subject like linear algebra, you may wonder: why do you need all these vectors and matrices? How are you going to apply all this inversions, transpositions, eigenvector and eigenvalues for practical purposes?

Well, if you study linear algebra with the purpose of doing machine learning, this is the answer for you.

In brief, you can use linear algebra for machine learning on 3 different levels:

• application of a model to data;
• training the model;
• understanding how it works or why it does not work.

Пользователи Lokalise могут выбирать, локализовать им свой продукт с привлечением наёмных переводчиков площадки, с собственной командой или исключительно своими силами. Именно для упрощения процедуры локализации тех проектов, где профессиональные переводчики не нужны и достаточно собственных знаний языка, мы и предоставляем нашим пользователям возможность использовать встроенные в Lokalise популярные системы машинного перевода от Google, Yandex, Microsoft и SDL. О том, как переводят эти системы, мы сегодня и поговорим на конкретных примерах.

Google Machine Translate/Google Neural Translate

Около полугода назад компания Google заявила о подключении очередного набора языков к нейронной сети своего сервиса Google Translate, в том числе и русского. Событие это стало знаковым для всего русскоязычного интернет-пространства: ежедневно тысячи человек пользуются встроенным в Chrome переводчиком Google или идут на сайт Google Translate за переводом иностранного текста на родной язык.

Embroidery can be a great way to personalize your clothing. You can add your name or the logo of your business. To make the process easier, many embroidery machines work with computer software. This allows you to create the design, then transfer it to the embroidery machine. By doing this, you’ll be able to automate the process. This will reduce the time it takes to produce beautiful designs.
Because of these benefits, there is a range of software options for you to choose from. This gives you a lot of choices to consider when picking what you want to use. But it can make finding the right one more challenging. Let’s look at some of the best software options to consider.

Hatch

If you’re looking for a leading type of software, you can try Hatch. This is based on three decades of experience. It also has a lot of innovative features that make it easy to use. First, it automatically assigns things like stitch length and placement, to suit the design you create. It also has an automatic branching function, so you’ll be able to sew continuously, rather than in stops and starts.
This software also comes with a lot of tools that are designed to make it easy for you to transform the design onto the computer. For example, you’ll be able to put a hand-drawn sketch into the software. You can also download one of the many existing designs. By doing this, it will be easy for you to create innovative embroidery designs. There are multiple levels, so you’ll only need to pay for the features that you find the most useful.