=> R0 = 4 (Media search end)
<= R0 preserved
This call is made by RISC OS to inform your program that a missing filing medium has been supplied, or that an operation involving one has been cancelled. It is always preceded by call(s) of OS_UpCall 1 or OS_UpCall 2. This call is typically used to remove error messages displayed when OS_UpCall 1 or 2 was first generated.
See PRM 1, page 186
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