=> R0 = reason code (0 to read, 1 to install)
R1 = pointer to handler code, or 0 to remove
R2 = handler private word
<= R0 preserved
R1 = pointer to previous handler code, or 0 if none installed
R2 = previous handler private word, or -1 if none installed
This SWI reads, or changes, the current 16-bit linear handler. Do not call this SWI unless you have already determined that 16-bit sound is supported.
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