This SWI writes the null terminated string following this SWI in memory using OS_WriteC. It uses the value in R14 to find the string, and updates R14 to point after string.
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.
This SWI can not be conditionally executed [unless the string you wish to write out also happens to be valid ARM code for the condition failed case :-) ].
See PRM 1, page 503.
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