h6. [[OS SWI Calls]] h6(. » [[OS_UpCall]] h6((. » OS_UpCall 4 h2. OS_UpCall 4 h5. (SWI &33) |_<^{width:4em}. Entry | | |<^. R0 |<^. 4| |_<^{width:4em}. Exit | | |<^. R0 |<^. Preserved| h4. Use The purpose of this call is to inform your application that a missing filing medium has been supplied, or that an operation involving one has been cancelled. h4. Notes 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. h4. See also * [[OS_UpCall]] * [[OS_UpCall 1]] * [[OS_UpCall 2]]