
Virtual 8-bit computer with 256 bytes of memory. A powerful learning tool for mastering Assembler, with lessons available in English. Try your hand at low-level programming!
Modeled estimate, not a reported figure. How we estimate →
About
Step into the era of early computing and feel like a real engineer from the past. ASTRA-256 isn’t just a computer — it’s a complete educational environment where you write real Assembler code for a virtual von Neumann architecture machine.
ASTRA-256 is:
An interactive simulator for learning Assembler from scratch.
A logic puzzle for those who love “real” programming.
A nostalgic time machine for veterans of the LPG-30, Altair 8800, and PDP-11.
This is the kind of machine pioneers of computing once used to solve real problems — under tight resource constraints, just like in the 1970s.
Assembler is the language the machine truly understands. It’s not obsolete — it’s foundational.
Still used in microcontrollers and embedded systems: from home appliances and automotive electronics to medical devices and IoT.
Gives you full control over the hardware — drivers, firmware, DSP, memory, and registers.
Essential for cybersecurity: reverse engineering, malware analysis, hacking, and low-level defense.
Helps you understand how high-level languages like Java, C++, and Python work under the hood.
Reveals the essence of computation — how bits become intelligence, how stacks, memory, and ALUs operate.
Understand Assembler, and you’ll understand how everything else works.
8-bit processor with accumulator and visible registers: IP, IN, OUT, SP, FLAGS.
256 bytes of memory — just like the original Altair 8800 released in 1975 with the Intel 8080.
75 instructions grouped by purpose: control flow, data movement, arithmetic, stack, I/O, and more.
Lessons and documentation in five languages — printable, just like in the good old days.
Start with simple programs and progress to complex algorithms: square roots, trigonometry, even mini-games.
ASTRA-256 runs on a custom Assembler designed specifically for this environment. We intentionally offer an extended instruction set — similar to what you’ll find in modern microcontrollers and processors.
It’s a hands-on way to gain foundational experience with low-level hardware logic — the kind that prepares you to work with any modern microcontroller. The principles haven’t changed.
Everything you need is built in: editor, debugger, help system.
Everything is real: memory, registers, instructions.
Everything is here to help you understand how computers truly work — not at the interface level, but at the bit level.
Who knows — maybe you’ll be the one to write the program that sends Elon Musk to Mars.
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Stats
All-time low is the lowest price we've recorded for this game since we started tracking it.
Languages: English, Ukrainian, French, German, Spanish - Spain, Spanish - Latin America
Engagement
Reviews
Игра заинтересовала, шлю разработчику луч поддержки и жду релиза.
I'm not a programmer as such. I'm only getting started in it as a hobby, and I find it very fascinating. Professionally, the only "programming" that I do is with industrial PLC's. While this software may not represent specific real world hardware, it's a great example of the limitations within which programmers had to work back in the day. It's a real eye-opener to be able to see the relationship between the instructions that you punch in, and their corresponding values in the processor's memory, and to be able to follow it step by step using the debug function. It's also a good exercise in working through the differences in writing code in a new language, as well as figuring out how to work with i/o that you are unfamiliar with. Well done!
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Hours played at review time, across 31 reviews with recorded playtime.
Я думав, Асемблер - це щось нереально складне, але ця програма повністю змінила моє уявлення. Усе пояснюється просто, зрозуміло і з прикладами, тож реально починаєш розуміти, як усе працює. Однозначно must-have для всіх, хто цікавиться низькорівневим програмуванням!
Computadora virtual de 8 bits para aprender Assembler, con lecciones en PDF en español. Útil si estás aprendiendo este lenguaje. Además tiene Workshop.
The manual doesn't help and the game seems too complicated and under-functional at the same time. Website over-hyped it, and I'm a huge fan of games like turing complete, but the UX on this game is crap.
Мені сподобався цей ретро-відтінок, почуття роботи на машині минулих десятиліть, що додає своєрідної атмосфери й водночас стимулює мислити “по-машинному”. І це не просто ностальгія — це дуже корисно для розуміння, як працюють сучасні комп’ютери “під капотом”. Єдине, що можна побажати — ще більше задач і прикладів, можливо більше автоматизованих вправ чи гейміфікації. Але навіть в поточному стані програма робить свою справу відмінно.
Я думав, Асемблер - це щось нереально складне, але ця програма повністю змінила моє уявлення. Усе пояснюється просто, зрозуміло і з прикладами, тож реально починаєш розуміти, як усе працює. Однозначно must-have для всіх, хто цікавиться низькорівневим програмуванням!
Nowadays, many people rely on high-level programming languages to solve problems, but it's important to remember how useful low-level languages are for optimizing and understanding systems. As performance and efficiency become more important, I believe programmers will need to use Assembly more often. This program is a great way to get ready for that future.
Пройшов курс з Асемблера і залишився задоволений. Матеріал подано доступно. Завдяки практичним прикладам, зміг краще зрозуміти архітектуру процесора і освоїти низькорівневе програмування. Відмінна програма для тих, хто хоче зайнятися програмуванням однокристальних систем!
I wouldn't say this is ideal for somebody who has no experience with programming at all, but if you understand the basics enough to be able to write a simple program in any language and understand fundamentals like binary, hex, conditional statements, etc. You should have no problem getting a handle on Astra-256. Even without experience like that, the manual makes it very easy to understand the language and how to input and manipulate data in Astra. I'm sure with a bit of trial and error, it wouldn't take much for somebody new to assembly, or fairly new to programming in general to write simple programs like writing data to memory, then performing math or logical operations on said data. And if you're looking to learn any sort of assembly language, this would be a great place to start! It's a very simple language and a very simple system that it's implemented on. Easily the most simple form of assembly I've ever used. But that's not to say it isn't also quite versatile. Especially with the recent addition of new instructions. My only issue with it at the moment is that the developer(s) haven't seemed to have updated the manual to include the new instructions. So I have to seek out the specific forum post about the new instructions, along with having a PDF of the manual open to be able to fully utilize everything it has to offer. But that's really quite a small issue and doesn't affect my enjoyability of it in the least bit. All in all, I would highly recommend this program to experienced programmers and newcomers alike. It makes for not only an educational experience. But also a very fulfilling experience when you find yourself churning out programs like the oldschoolers did. And It really gives you an appreciation for the limitations they had to work with back then. As well as gives you a great appreciation for the works those programmers made while having to work around such limitations.
Players by region
Where this game's players are, estimated from review languages.
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