I had to look up Z88DK[1], it’s a cross compiler for the Z80 CPU family that started on the Sinclair designed Cambridge Z88 portable[2].

What confused me about in the headline is that the Z88 came with BBC BASIC.

Oh well an interesting and related family tree any way.

1. https://z88dk.org/site/

2. https://en.wikipedia.org/wiki/Cambridge_Z88

Quite cool, just gave me a weekend idea.