=> R0 = 10
R1 = pointer to address to read string from
R2 = directory separator character, typically '.' or '/' (ASCII code)
<= R0, R2 preserved
R1 = pointer to character after the input's terminator
R3 = pointer to output string (up to 255 chars)
This call takes an input path string (e.g. ADFS::HD4.$.Sounds.Wave‘) and returns what follows the last instance of the separator character (in this case, Wave‘).
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