My code repository contains a link to a youtube channel where the board was discussed, and where I found it randomly. But sadly the upstream site of the provider and the (useful) forums it hosted are gone unless you use the wayback machine:
As an alternative - Agon Light 2 (eZ80 CPU). By default it comes with BBC BASIC modified to take advantage of 24 bits addressing, but it can run CP/M if you want. The nice thing about Agon is that it can run standalone if you add to it a keyboard and a VGA display.
