=> R1 = &43 (reason code)
R2 = 1 (sub reason code)
R3 = pointer to null terminated alphabet name
<= R1 = 0 to claim, preserved otherwise
R4 = country number, or preserved if unrecognised
This service converts an alphabet name to number. If a module provides additional alphabets it should check this service - if the name matches (case insensitive, allow abbreviations with ".") one provided by the module it should claim this service.
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