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Plexus P/20 Emulator

2026-04-19 | original

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Why This Matters

The Plexus P/20 Emulator offers a faithful recreation of a vintage Unix server from the 1980s, enabling enthusiasts and developers to experience legacy systems without the need for original hardware. Its web-based implementation broadens access, making it easier for users to explore historical computing environments and preserve technological history. This development highlights the ongoing importance of emulation in maintaining digital heritage and supporting educational initiatives in computing history.

Key Takeaways

Emulates a vintage Plexus P/20 Unix server from the 1980s.
Runs in real-time via web browsers using WebAssembly and JavaScript tools.
Supports preservation and educational exploration of legacy computing systems.

This is a pretty faithful Plexus system emulator. It runs more or less in real time, meaning things may take a while. If you get stuck, try the following:

This is an emulator for a Plexus P/20 system, which is an Unix server from the '80's. It runs SystemV Unix on a dual 68010 processor mainboard. Adrian Black (from Adrian's Digital Basement) did some videos on the topic of getting one to work: 1 2 3 4 5.

This emulator is written in C. While it can be ran as a native program, the version you're looking at right now is compiled to webassembly using Emscripten. It uses xterm.js for the fancy terminal, which is connected to Emscripten via xterm-pty.

Plexus emulator © 2024 Sprite_tm and contributors. Licensed under the MIT license. Source code for this emulator is on Github.

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