h6. [[OS SWI Calls]] h6(. » [[OS_Byte]] h6((. » OS_Byte 212 h2. OS_Byte 212 h5. (SWI &06) |_<^{width:4em}. Entry | | |<^. R0|<^. 212 (&D4) | |<^. R1|<^. EOR value | |<^. R2|<^. AND value | |_<^{width:4em}. Exit|_<^. | |<^. R0|<^. Preserved | |<^. R1|<^. Previous volume | |<^. R2|<^. Bell frequency (see [[OS_Byte 213]]) | h4. Use The purpose of this call is to read or write the sound volume for the bell. h4. Notes This call reads or sets the bell volume, the range 128 (loud) - 248 (soft). [[*Configure Loud|*Configure Loud]] sets the volume to &90. [[*Configure Quiet|*Configure Quiet]] sets the volume to &D0. To read/write the bell channel use [[OS_Byte 211]]. 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 211]] * [[OS_Byte 213]] * [[OS_Byte 214]] * [[VDU 7]]