vc[n | p | r | v] number[,number [,...]]
The vc command clears the specified interrupt vector and reinstalls the previous interrupt vector.
n
Removes the beep from traps that beep when encountered; does not clear the traps.
p
Clears protected-mode vectors only.
r
Clears real-mode vectors only.
v
Clears virtual 8086 (V86) mode vectors only.
number
Specifies the interrupt vector to clear.