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Implement "Set margin-bell volume (DECSMBV), VT520."
trafficstars
Implement the following VT sequence:
CSI Ps SP u
Set margin-bell volume (DECSMBV), VT520.
Ps = 0 , 5 , 6 , 7 , or 8 -> high.
Ps = 1 -> off.
Ps = 2 , 3 or 4 -> low.