It certainly didn't have market penetration in USA!
I did once have, and implemented in XenoCopy, a sample disk from an Okidata 
if800 model 20, which seemed to be the same as a BMC if800 model 20 (if one 
more alternate name might help you find information). I hadn't heard the 
Sumicom badging.
I also had a disk for Oki (don't know if same model) with the Microsoft 
Stand-Alone BASIC, instead of CP/M.

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.

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