Dev.to·Tuesday, December 30, 2025

Dev.to - Tuesday, December 30, 2025

10 stories~15 min

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Stories Covered

Zilog Z80: the small CPU that powered an entire generation

Before powerful laptops and smartphones, there were small computers that felt magical for their time. Many of them were powered by one chip: Zilog Z80 The Z80 is one of the most important CPUs ever made not because it was fast, but because it was everywhere. What the Z80 actually is The Zilog Z80 is an 8-bit microprocessor released in the mid-1970s. It was designed to be: It was compatible with the older Intel 8080, but added many improvements. That made it very attractive to computer makers. W

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IBM Z: the computer that never learned how to die

Most computers are replaced every few years. IBM Z systems are different. They are designed to run for decades. IBM Z is not a normal CPU platform. It is a mainframe architecture built for reliability, security, and massive workloads. This is the kind of computer that banks and governments trust with everything. What IBM Z actually is IBM Z is both: The instruction set used by IBM Z is commonly called s390x. This architecture is designed for: Programs written decades ago can still run today. Wha

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Keep your Ubuntu‑based VPN Server Updated

🔄 Automate Monthly System Updates on Ubuntu 24.04 A simple, reliable way to keep your Ubuntu‑based VPN server fully updated. This guide shows you how to create an update script, schedule it to run monthly, optionally reboot afterward, and verify everything is working. First, create the script file: sudo nano /usr/local/bin/auto-update.sh Paste the following into the file: #!/bin/bash # Update package lists and upgrade everything apt-get update && apt-get dist-upgrade -y # Clean up old files

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WebHook x WebSocket : O que são?

A importância das integrações Como desenvolvedor, nos deparamos com diversos tipo de integrações e maneiras de desenvolver uma solução. Um grande exemplo disso, seria uma grande dúvida: Se eu tenho um App que utiliza PSP's (Payment Service Provider), como posso saber que meu pagamento foi Aprovado, Recusado ou deu algum tipo de erro? Podemos pensar primeiramente em 3 tipos de soluções: Short pooling, Long Pooling e Webhooks. Short Pooling E então o PSP responde: "Ainda não", "Ainda não", "Ainda

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The Technology Stack Behind Asset Tokenization Platforms

Asset tokenization is revolutionizing how we think about ownership, investment, and value transfer in the digital age. From real estate and fine art to commodities and intellectual property, virtually any asset can now be represented as digital tokens on a blockchain. But what powers these sophisticated platforms? Understanding the technology stack behind asset tokenization is crucial for businesses considering this transformative approach. In this comprehensive guide, we'll break down the layer

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Understanding How Git Internals Work?: PART-1

Hello, I'm Ganesh. I'm working on FreeDevTools online, currently building a single platform for all development tools, cheat codes, and TL; DRs — a free, open-source hub where developers can quickly find and use tools without the hassle of searching the internet. Do you know how to use git? This might be the most common question asked when you join any software company, because the same question was also asked of me. git commit, git push, git checkout, and a few more commands. Furthermore, worki

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DEC Alpha: the fastest CPU architecture you probably never used

DEC Alpha is one of those technologies that makes engineers quietly sad. Not because it was bad. DEC Alpha was a CPU architecture that was far ahead of its time. For a while, it was the fastest general-purpose processor in the world. And yet, almost nobody talks about it today. What DEC Alpha was DEC Alpha was a 64-bit RISC architecture created by Digital Equipment Corporation (DEC) in the early 1990s. At a time when: Alpha arrived fully 64-bit and unapologetic. It was designed for: Why Alpha wa

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Are Feature Flags Bullsh*t? Why Your "IF" is Killing Performance (and the Planet)

Are Feature Flags Bullsh*t? Why Your "IF" is Killing Performance (and the Planet) My name is Matheus de Camargo Marques. I’m not sure how my last article relates to this one; all I know is that a lot of time has passed and much has changed. Let’s start at the beginning. How I arrived at this conclusion isn't the point right now. For years, I’ve been studying Computable Cognitive Architectures alongside Erlang, Elixir, and the Actor Model. Recently, I remembered a professor named Simão, whose r

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MIPS architecture: simple, clean, and quietly everywhere (once)

MIPS is one of those architectures everyone learns about, assumes is dead, and then accidentally uses without realizing it. It never dominated desktops. MIPS is a classic RISC instruction set that focused on simplicity, predictability, and clean design long before those became buzzwords again. What MIPS actually is MIPS is a RISC instruction set architecture. Its core ideas: It was designed so well that it became the teaching ISA for computer architecture courses for decades. If you learned pipe

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Pipes

In my journey to master Go my next objective was to update my shell to be able to handle commands that look like: tail -f test.log | head -3 First idea was to collect command 1 output and then invoke command 2 with the collected output as argument. But as you may notice command 1 is tail -f which does not exit on its own and it means that it would block the execution. More over if you try to test it: echo line1 > test.log tail -f ./test.log | head -3 then in another terminal window you try ech

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