h6. [[OS SWI Calls]] h6(. » [[OS_Byte]] h6((. » OS_Byte 211 h2. OS_Byte 211 h5. (SWI &06) |_<^{width:4em}. Entry | | |<^. R0|<^. 211 (&D3) | |<^. R1|<^. EOR value | |<^. R2|<^. AND value | |_<^{width:4em}. Exit|_<^. | |<^. R0|<^. Preserved | |<^. R1|<^. Previous channel | |<^. R2|<^. Bell volume (see [[OS_Byte 212]]) | h4. Use The purpose of this call is to read or write the sound channel for the bell ([[VDU 7]]). h4. Notes The default channel is 1. To read/write the bell volume use [[OS_Byte 212]]. To read/write the frequency use [[OS_Byte 213]]. To read/write the duration use [[OS_Byte 214]]. h4. See also * [[OS_Byte]] * [[OS_Byte 212]] * [[OS_Byte 213]] * [[OS_Byte 214]] * [[VDU 7]]