How to Download ASTRA-256 Assembler

1. Click on the ASTRA-256 Assembler download button below.
2. Choose "Install" to install the game on the windows steam client.
3. Follow the on-screen prompts
4. Let it download the Full Version.
5. Once a game is downloaded, use the Windows Steam Client to play the game.

=== Download Game ====

Download for pc →

This guide describes how to use Steam Proton to play and run Windows games on your Linux computer. Some games may not work or may break because Steam Proton is still at a very early stage.

1. Activating Steam Proton for Linux:
Proton is integrated into the Steam Client with "Steam Play." To activate proton, go into your steam client and click on Steam in the upper right corner. Then click on settings to open a new window. From here, click on the Steam Play button at the bottom of the panel. Click "Enable Steam Play for Supported Titles."

Alternatively: Go to Steam > Settings > Steam Play and turn on the "Enable Steam Play for Supported Titles" option.

Valve has tested and fixed some Steam titles and you will now be able to play most of them. However, if you want to go further and play titles that even Valve hasn't tested, toggle the "Enable Steam Play for all titles" option.

2. Choose a version
You should use the Steam Proton version recommended by Steam: 3.7-8. This is the most stable version of Steam Proton at the moment.

3. Restart your Steam
After you have successfully activated Steam Proton, click "OK" and Steam will ask you to restart it for the changes to take effect. Restart it. Your computer will now play all of steam's whitelisted games seamlessly.

4. Launch Stardew Valley on Linux:
Before you can use Steam Proton, you must first download the Stardew Valley Windows game from Steam. When you download Stardew Valley for the first time, you will notice that the download size is slightly larger than the size of the game.
This happens because Steam will download your chosen Steam Proton version with this game as well. After the download is complete, simply click the "Play" button.

Windows Pc Requirements

Minimum:

• OS *: Windows 11, 10, 8.1, 8, 7, Vista (32, 64 bit)
  
• Processor: Dual Core 2 GHz
  
• Memory: 64 MB RAM
  
• Graphics: Requires a Direct3D 11 compatible videocard
  
• DirectX: Version 11
  
• Storage: 50 MB available space

No maximum requirements!!

Linux Requirements

Minimum:

• OS: Ubuntu 16.04 LTS 64-Bit
  
• Processor: Dual Core 2 GHz
  
• Memory: 64 MB RAM
  
• Graphics: Requires a OpenGL 1.4 compatible videocard
  
• Storage: 50 MB available space

No maximum requirements!!

Mac Requirements

No minimum requirements!!
No maximum requirements!!

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!

ASTRA-256 — A BINARY VIRTUAL MACHINE PROGRAMMED IN ASSEMBLER

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.

LEARN BY PLAYING

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.

WHY LEARN ASSEMBLER?

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.

WHAT CAN ASTRA-256 DO?

• 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.

PLAY, LEARN, PROGRAM

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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