The character whose code you wish to return.
A character set. Legal values for
Additionally, on Windows,
can be a valid Windows code page identifier.
(+ (* 100 row) column)
(+ (* 256 first-byte) second-byte)
is Shift-JIS encoded in the same way. Strictly speaking, EUC and Shift-JIS are not coded character sets, but encodings of the JIS sets, but the encoding is easily expressed as an integer, so the same interface to it is used.
LispWorks User Guide and Reference Manual - 21 Dec 2011