DOS/V is an implementation of a Japanese character set that uses the undefined columns of JIS X 0201; those bytes are the first bytes for 2-byte Kanji characters. This encoding is called the Shift-JIS encoding.
The following tables show the Shift-JIS encoding according to character values and selected Shift-JIS characters. The figures in Shift-JIS Encoding for Kanji and Shift-JIS Encoding: Detailed View show the encoding ranges.