=> R1 = &43 (reason code)
R2 = 3 (sub reason code)
R3 = alphabet number
R4 = pointer to buffer
R5 = length of buffer
<= R1 = 0 to claim, preserved otherwise
R2-R4 preserved
R5 = number of characters put into buffer, or preserved if unrecognised.
This service converts an alphabet number to name. If a module provides additional alphabets it should check this service - if the number matches one provided by the module it should claim this service.
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