According to this alt2600 FAQ page (which repeats what you already know), the standard used for track encoding is ANSI/ISO 7811/1-5, available from the American Bankers Association.

Hope this helps.

— Arien

Update: These seem to be the character encoding definitions from the ISO standards. (Track 1 data is discussed in section 7.1)

In reply to Re: Parsing credit card track data by Arien
in thread Parsing credit card track data by Ovid

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