=> R0 = pointer to null-terminated string
<= R0 = pointer to the byte after the null
This SWI sends the string pointed to by R0 to all active output streams.
If WrchV has not been intercepted with OS_Claim it will directly call the VDU driver which is faster, otherwise it calls OS_WriteC to write each character.
See PRM 1, page 504.
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