h6. [[Programmer's Reference Manuals]] h6(. » [[Service Calls]] h6((. » Service_UKByte h2. Service_UKByte h5. (Service &07) |_<^{width:4em}. Entry | | |<^. R0 |<^. Pointer to [[SWI Error Block|error block]]| |<^. R1 |<^. 7 (&07)| |<^. R2 |<^. [[OS_Byte]] number| |<^. R3 |<^. R1 passed to OS_Byte command| |<^. R4 |<^. R2 passed to OS_Byte command| |_<^{width:4em}. Exit | | |\2<^. All registers preserved to pass on, else | |<^. R1 |<^. 0 (claim service) | |<^. R3 |<^. R1 to return to caller | |<^. R4 |<^. R2 to return to caller | h4. Use This service is issued when an unknown [[OS_Byte]] code is given. h4. Notes [[ByteV]] vector should be used in preference to trapping this service. h4. See also * [[ByteV]] * [[OS_Byte]] * [[Service Calls]]