The set of "non-iso" character sets is theoretically infinite, therefore as literally posed, the requirement isn't computable.

However, Convert modules do exist for converting specific non-iso character sets into ASCII, for example:

Convert::IBM390 for EBCDIC to ASCII

Convert::Cyr switches the code page between any pair of the following character sets

- koi8-r

- windows-1251

- iso8859-5

- x-cp866

- cp866

- x-mac-cyrillic.