Experience the Dawn of Microprocessing!

RetroAsm 4004 is an interactive, pocket-sized assembler and emulator for the i4004 - the world's very first commercial microprocessor.

Whether you are a retro-computing enthusiast, a student learning low-level assembly, or a collector, this tool brings 1971 computing directly to your fingertips with a modern, game-like experience.

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Key Features

    Real-Time Execution & Visual Debugging: Track Register banks (R0-R15), Accumulator (ACC), Carry flag (CY), and Program Counter (PC) line-by-line in real time.

    Instruction Collection System: Unlock all 46 authentic i4004 opcodes as you write, load, and run programs! Can you complete the entire instruction codex?

    Built-In Demo: Pre-loaded with a non-infinite success demo featuring Port I/O, Decimal Adjust (DAA), and Subroutines to showcase the architecture right away.

    Save & Load Persistence: Automatically saves your source code and collection progress.

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Ultra-Limited Supporter Edition (Only 10 Copies!)

Support this project on Ko-fi to receive a one-of-a-kind personalized APK with your name engraved directly on the app screen and a unique digital serial number!

    $5+ Tier: Custom Digital Serial Number (e.g., SERIAL #0001 - #0010)

    $10+ Tier: Custom Supporter Name Engraved on the App Screen

    $15+ Tier (Collector's Pass): BOTH Serial Number + Custom Name!

How to Order:

    1.Click the "Support on Ko-fi" button inside the app or via the link below.　　　

               Support on Ko-fi via this link: https://ko-fi.com/studio_mars

    2. Send your tip on Ko-fi and leave a message mentioning "RetroAsm 4004":

          - For $10+ / $15+ Supporters: Include your preferred Name / Handle for in-app engraving. (Max 15 characters, alphanumeric & spaces only)

          - For $5+ Supporters: Custom Serial Number only will be assigned.

    3. Your personalized APK will be built and delivered directly to you via Ko-fi message within 1-2 business days!

Important Notes regarding Serial Numbers:

    First-Come, First-Served: Serial numbers (#0001-#0010) are assigned strictly in the order received on Ko-fi.

    Over-Capacity Orders: If orders exceed the initial 10 slots before the page is updated, your order will still be processed with the next sequential serial number (#0011 onwards).

    Future Batches: Depending on demand, additional series/batches may be opened in the future.

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Privacy & Security

    100% Offline & Local: Runs entirely on your device with no internet connection required.

    Zero Data Collection: No ads, no analytics, and zero personal data tracked, stored, or sent.

System Requirements

    Platform: Android

    OS Version: Android 8.0 (Oreo / API level 26) or higher

    File Format: APK

Feedback & Support

If you find any bugs or have suggestions for new features, please leave a comment in the community section below!

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Credit & Copyright

Developer: Studio Mars

Copyright (C) 2026 Studio Mars. All rights reserved.