=> R0 = 6
R1 = pointer to address to read string from
<= R0 preserved
R1 = pointer to character after the input's terminator
R2 = TRUE (-1) or FALSE (0) for valid or invalid respectively
This call reads a string from memory, if it finds that the string contains non-numeric characters then it will return FALSE. If it finds that the string contains only numeric characters, then it will return TRUE.
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