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I think EBCDIC is going to be a pain. For one thing, many mainframe systems assumes fixed length records with no newline separator. I thought that different mainframes would use different characters to determine a newline. \x15 and \x25 are two that are used. Also, according to the documentation for Convert::EBCDIC, there is a standard EBCDIC and a version used for OS390 (which may account for the different line endings).
One problem there is that the EBCDIC Newline doesn't really translate to the ASCII CR or LF. Further, since the 'newline' varies on ASCII systems, I can only imagine that it's going to vary on EBCDIC systems. Admittedly, it's been a while since my mainframe days (no, I wasn't a Y2K boy), but I doubt you'll find a truly universal solution without the user choosing how their newline gets translated.
Here's an interesting chart of the EBCDIC characters. What the heck is a "Required newline" (\x06)? I sure as heck don't remember that.
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