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JEF is a stateful EBCDIC charset used in Fujitsu mainframe systems called FACOM and some OASYS series personal word processors. JEF is an acronym for "Japanese processing Extended Feature". It was introduced by Fujitsu in April 1979, but the implementation predates JIS C 6226-1978.
Encoding structure
Here are the valid ranges of bytes according to its encoding structure.
References
JEF codepage Wikipedia(Text) CC BY-SA