h6. [[OS SWI Calls]] h6(. » [[OS_Byte]] h6((. » OS_Byte 1 h2. OS_Byte 1 h5. (SWI &06) |_<^{width:3em}. Entry | | |<^. R0|<^. 1 | |<^. R1|<^. New value | |_<^{width:3em}. Exit|_<^. | |<^. R0|<^. Preserved | |<^. R1|<^. [[Machine Types|Machine type]] | |<^. R2|<^. Corrupted | h4. Use The purpose of this call is to write a location that is unused by the OS, which can then be used to pass results between applications. h4. Notes The location may be read (and written) with [[OS_Byte 241]]. This is a legacy call provided for compatibility with the 8-bit range of Acorn machines. System variables now provide a much better way of passing results, and should be used in instead. h4. See also * [[OS_Byte]] * [[OS_Byte 241]] * [[Machine Types]]