[TUHS] UNIX on Tandem

[Warner Losh via TUHS]

I thought it was NONSTOP at one point...

Warner

On Fri, Jan 9, 2026 at 1:22 PM Ronald Natalie via TUHS <tuhs at tuhs.org>
wrote:

> I guess T/TOS was the original name (Tandem / Transaction Operating
> System) but they tossed it for Guradian.
>
>
> ------ Original Message ------
> From "Paul McJones" <paul at mcjones.org>
> To "Ron Natalie" <ron at ronnatalie.com>
> Cc tuhs at tuhs.org
> Date 1/9/2026 1:38:12 PM
> Subject Re: [TUHS] Re: UNIX on Tandem
>
> >>Tandem’s architecture was an interesting one, but I had
> >>not heard of a UNIX port to it.   Had it’s own, unlike anything else,
> >>OS
> >>called TOS or something.
> >
> >The operating system was called GUARDIAN. The manuals are available
> >here:
> >
> >https://bitsavers.org/pdf/tandem/
> >
> >And this is an SOSP’81 paper about the design of the operating system:
> >
> >https://doi.org/10.1145/800216.806587