Query on Encoding supporting Roman numbers, Circled numbers in Japanese strings

Hi All,

I've a simple application which accepts Japanese string from a HTML form 
and then show the same string in the response page.

Now if I enter Roman characters like I, II, etc and Circled numbers like 
$B-!!"-"(B etc as a part of Japanese string, the string is properly shown back 
in response page when the encoding used is UTF-8. However, the same thing 
does not work in case of EUC_JP, Shift_JIS and ISO-2022-JP as encoding.

I believe these characters are not supported in EUC_JP, Shift_JIS and 
ISO-2022_jp. Can anyone please confirm it ?

Regards,
Sourav