h6. [[Programmer's Reference Manuals]] h6(. » [[Vectors]] h6((. » [[Software Vector Numbers]] h6(((. » UKSWIV h2. Unknown SWI Vector (24) |_<^{width:3em}. Entry |<^. | |<^. R0-R8|<^. Register parameters for SWI| |<^. R11|<^. "SWI number":link1| h4. Use This vector is called when an SWI with an unknown number is issued. h4. Notes When an SWI is called, the following steps are taken: # Checks if the SWI number is < 512 - if so it calls the appropriate kernel SWI # Checks whether any relocatable module defines that SWI via its SWI table # If no module claims the SWI it is passed to this vector, where it may be claimed # Any SWIs still unrecognised is passed to the unknown SWI handler, set up by [[OS_ChangeEnvironment]]. h4. See also * "Introduction to SWI names and numbers":link1 * [[OS_ChangeEnvironment]] * [[Software Vector Numbers]] [link1]Introduction%20To%20SWIs#names