JEF codepage

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 actually predates JIS C 6226-1978.

Encoding structure

Here are the valid ranges of bytes according to its encoding structure.

Byte Range Purpose	Byte Range in Hexadecimal	Comment
single byte	41-F9	Includes graphic characters. Does not include unassigned characters nor ISO control characters.
shift to single byte mode	29
shift to double byte mode	28
first byte of double byte	40, 41-7D, 7F-FE	A1-FE are JIS C 6226-1978 characters. 41-7D, 7F are extended characters. 80-A0 are user defined characters. Byte 40 is only valid when followed by byte 40.
second byte of double byte	40, A1-FE	40 is only valid when preceded by byte 40. 0x40 0x40 makes the ideographic space character.

External links

• The Japanese Language Information System JEF

References

• Lunde, Ken. CJKV Information Processing. Sebastopol, Calif.: O'Reilly & Associates, 1998. ISBN 1-56592-224-7.