I also had a disk for Oki (don't know if same
model) with the Microsoft
Stand-Alone BASIC, instead of CP/M.
On Mon, 15 Nov 2021, pleasefixthisbrick via cctech wrote:
Unfortunately, the model 20 was a different
architecture all together. I
have begun looking into Japanese museums. Maybe there is more documentation
and data in its country of origin.
I don't know where Okidata's primary markets were, but, the sample disk
that I had came from Russia!