JEF (Japanese-processing Extended Feature) is an EBCDIC encoding used on Fujitsu FACOM mainframes, contrasting with FMR (a variant of Shift JIS) used on Fujitsu PCs. Like KEIS, JEF is a stateful encoding, switching to a double-byte DBCS-Host mode using shifting sequences (where switches to single-byte mode and switches to double-byte mode). Also similarly to KEIS, JIS X 0208 codes are represented the same as in EUC-JP. The lead byte range is extended back to 0x41, with 0x80–A0 designated for user definition; lead bytes 0x41–7F are assigned row numbers 101 through 163 for kuten purposes, although row 162 (lead byte 0x7E) is unused. Rows 101 through 148 are used for extended kanji, while rows 149 through 163 are used for extended non-kanji.