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The following information is provided as is, and the authors take no responsibility for the correctness.
Hiper-C is a language that is used in some OKI printers. It has a sort of binary CGM structure.
Hiper-C seems to be Oki’s interpretation of Zenographics’ ZjStream - Zenographics SuperPrint Zj Stream protocol. Have a look at the okidecoder program from the foo2zjs package.
All text is available under the terms of the GNU Free Documentation License (see Copyrights for details). Disclaimers