=> R0 = 212 (&D4)
R1 = EOR value
R2 = AND value
<= R0 preserved
R1 = previous volume
R2 = bell frequency (see OS_Byte 213)
This call reads or sets the bell volume, the range 128 (loud) - 248 (soft). The default volume is &90 for *Configure Loud, &D0 for *Configure Quiet.
See PRM 1, page 662
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