---
title: TOPS-20 PDP-10 Emulator
emoji: "\U0001F5A5"
colorFrom: blue
colorTo: blue
sdk: docker
app_port: 7860
custom_headers:
  cross-origin-embedder-policy: require-corp
  cross-origin-opener-policy: same-origin
  cross-origin-resource-policy: cross-origin
---

# TOPS-20 PDP-10 Emulator

A PDP-10 mainframe emulator running DEC TOPS-20 V7.0 in your browser via WebAssembly.

Click **Boot TOPS-20** and wait ~30 seconds for the boot sequence to complete.

WebAssembly port via agentic coding by Rob Chang.
KLH10 emulator by Kenneth L. Harrenstien.
Panda TOPS-20 distribution by Mark Crispin.

Source: [github.com/robchang/tops20](https://github.com/robchang/tops20)