IRS Pyramid buy and 3B2-Mips on Google. 

https://books.google.com/books?id=a4Jp5vySB-UC&pg=PA100&lpg=PA100&dq=Irs+to+buy+pyramid+at%26t&source=bl&ots=G_oVO6qpOx&sig=ACfU3U3EckPvlhXgj1NGrwhO1lsaBp3iWQ&hl=en&sa=X&ved=2ahUKEwjF1uy2qZXnAhVxmuAKHXhCCqEQ6AEwAHoECAEQAQ#v=onepage&q=Irs%20to%20buy%20pyramid%20at%26t&f=false
Sent from pechter@gmail.com

-----Original Message-----
From: Henry Bent <henry.r.bent@gmail.com>
To: Jon Forrest <nobozo@gmail.com>
Cc: The Unix Heritage Society mailing list <tuhs@tuhs.org>
Sent: Tue, 21 Jan 2020 13:17
Subject: Re: [TUHS] Unix on Zilog Z8000?

On Tue, 21 Jan 2020 at 12:53, Jon Forrest <nobozo@gmail.com> wrote:

> There's been a lot of discussion about early Unix on Intel, National
> Semi, Motorola, and Sparc processors. I don't recall if Unix ran on
> the Z8000, and if not, why not.
>

A tiny bit of research would have answered this question for you:
https://en.wikipedia.org/wiki/Zilog_Z8000#Z8000_CPU_based_systems

-Henry