Does anybody have documentation or know about the OKI IF800/300 a.k.a. Sumicom System 830

[pleasefixthisbrick]

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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.
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I also had a disk for Oki (don't know if same model) with the Microsoft Stand-Alone BASIC, instead of CP/M.
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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.