EUC-JP and the Yen sign

[Martin v. Loewis]

> Open Group in Japan published advisory documentations:
> http://www.opengroup.or.jp/jvc/cde/appendix.html
> it also said that 0x5C is yen sign.

For those of us not fluent in Japanese, can you please explain the
tables in http://www.opengroup.or.jp/jvc/cde/ucs-conv.html#ch3_1_2 ?
There is one table saying that eucJP-open character 0x5C relates to
U+00A5, and another saying that it relates to U+005C.

Also, can you explain the relevance of the eucJP-*open* character name
designation? The OpenGroup registry
( ftp://ftp.opengroup.org/pub/code_set_registry/cs_registry1.2h )
only knows of eucJP:1993; it comments on that character set

Comments
        Implementation of the EUC (Extended UNIX Codes) encoding
        method, with ISO 646:1991 IRV assigned to CS0, JIS X0208:1990
        assigned to CS1, JIS X0201:1976 assigned to CS2, and
        JIS X0212:1990 assigned to CS3.
end

which, to me, says that the IRV is used for 05/12 (i.e. reverse
solidus).

Furthermore,
http://www.y-adagio.com/public/standards/tr_xml_jpf/kaisetsu.htm lists
a number of eucJP variants; it appears that x-eucjp-unicode-0.9,
x-eucjp-jisx0221-1995, x-eucjp-open-19970715-ms all map character 5C
to U+005C, whereas x-eucjp-open-19970715-0201 is listed as mapping it
to U+00A5.

It may be clear to you; to me, it is not.

Regards,
Martin