You type
3 4 + .
It answers
7 ok
Numbers go on a stack; + adds the top two; . prints the result.
Try StarshipOS
Last modified by Robert James on 2026/11/07 13:50
ok> try it
A StarshipOS machine of your own.
Not a recording, not a simulation of StarshipOS: the console below is a real machine, started just for you and already at its prompt. You are Zuse, the superuser — of a machine that exists only for your session. There is nothing to break, and nothing you do is kept.
If the console does not connect, every machine is in use: try again in a few minutes.
Zuse
the superuser, of this machine only
amd64
LithosAnanke v2.1.0 · StarForth v4
30 min
then it is gone; reload for a new one
Offline
no network inside the machine
Things to try
StarshipOS speaks FORTH.
Type a line and press Enter. When the machine has done it, it answers ok.
You type
: SQUARE DUP * ;
It answers
ok
You have just taught the machine a new word, SQUARE.
You type
7 SQUARE .
It answers
49 ok
…and used it, as if it had always been there.
A machine of your own
Resumed at its prompt from one that booted, passed its 538 power-on self-tests and logged Zuse in — so you never wait for a boot.
The latest green build
Always the most recent build that booted on amd64, aarch64 and riscv64 and passed every acceptance check.
A Zuse of its own
Zuse is whoever holds the identity drive. Here it is a demo Zuse minted for this page alone — not anyone's real identity.
Gone when you go
Close the page, or let 30 minutes pass, and the machine is stopped and discarded. The next visitor starts clean.
A small server
Emulated, so a little slower.
The demo runs in an emulator on a modest server: slower than StarshipOS on real hardware, and only a few machines at once. The real thing boots straight from firmware, with nothing beneath it.