Searching for Intersil, I found an OSI board compatible with both Z80 and 6100 (12 bit). There’s also a video
https://users.glitchwrks.com/~glitch/2017/02/26/osi-560z-build
Then I found this site with 2 posts about OSI Challenger 1P
https://www.vintagevibe.co.nz/category/vintage-computers/ohio-scientific/
He also has a 2650 Mini Computer
And last not least a 1979 Italian Z80 trainer but missing the golden caseing. There’s also a NBZ80-S. Breadboard and remote controller
Better pic and info here (in German)
