This SWI is obsolete. Use OS_ChangeEnvironment instead.
=> R0 = address of the unused SWI handler; or 0 to read
<= R0 = address of the previous UnusedSWI handler
This sets up the address of the UnusedSWI handler. Internally, OS_UnusedSWI just calls OS_ChangeEnvironment.
See PRM 1, page 307.
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